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Polar and Non-polar Molecules (The milk and food coloring experiment!)
 
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This video is about Polar and Non-polar Molecules (The milk and food coloring experiment!)
Views: 1342 Caylin Smith
Polar and non polar substances | Solutions | Chemistry
 
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A polar molecule is one in which the atoms are arranged such that one end of the molecule has a positive charge and the opposite end has a negative charge.In this video we see that polar substances only dissolve in polar solvents and non polar substances in non polar solvents. Potassium permanganate, a polar compound, is added to water, a polar solvent and to carbon tetrachloride, a non polar solvent. We see that it dissolves only in water. In a similar fashion, a non polar element iodine is added to the same two solvents. This time, we see, that iodine only dissolves in carbon tetrachloride.
Views: 52307 KClassScienceChannel
Chemistry Experiment 5.2 Polar and Nonpolar (Berean Builders)
 
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Chemistry Experiment 5.2 Polar and Nonpolar Discovering Design with Chemistry by Dr. Jay L. Wile Fig Leaf Times Two by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1200096 Artist: http://incompetech.com/
Views: 692 Teach at Home
VSEPR Theory: Introduction
 
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To see all my Chemistry videos, check out http://socratic.org/chemistry This is an introduction to the basics of VSEPR Theory. VSEPR theory is a set of rules for how to look at a Lewis structure and determine the three dimensional (3D) shape of a molecule. The shapes have to do with the location of bonds and lone electrons pairs. In this video, we'll look at the following shapes: linear, trigonal planar, bent, tetrahedral, and trigonal bipyramidal
Views: 1671494 Tyler DeWitt
Polar Molecules Tutorial: How to determine polarity in a molecule
 
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This video looks at how to determine polarity in a molecule by understanding how the bond polarities, molecule shape, and outside atoms influence polarity using bond polarity vector addition. This includes a flow chart that guides you through the various decisions needed to determine if a molecule is polar or not. Wikipedia 1/1/2018: In chemistry, polarity is a separation of electric charge leading to a molecule or its chemical groups having an electric dipole or multipole moment. Polar molecules must contain polar bonds due to a difference in electronegativity between the bonded atoms. A polar molecule with two or more polar bonds must have a geometry which is asymmetric in at least one direction, so that the bond dipoles do not cancel each other. While the molecules can be described as "polar covalent", "nonpolar covalent", or "ionic", this is often a relative term, with one molecule simply being more polar or more nonpolar than another. However, the following properties are typical of such molecules. A molecule is composed of one or more chemical bonds between molecular orbitals of different atoms. A molecule may be polar either as a result of polar bonds due to differences in electronegativity as described above, or as a result of an asymmetric arrangement of nonpolar covalent bonds and non-bonding pairs of electrons known as a full molecular orbital. Polar molecules[edit] The water molecule is made up of oxygen and hydrogen, with respective electronegativities of 3.44 and 2.20. The dipoles from each of the two bonds (red arrows) add together to make the overall molecule polar. A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other. The dipoles do not cancel out resulting in a net dipole. Due to the polar nature of the water molecule itself, polar molecules are generally able to dissolve in water. Other examples include sugars (like sucrose), which have many polar oxygen–hydrogen (−OH) groups and are overall highly polar. If the bond dipole moments of the molecule do not cancel, the molecule is polar. For example, the water molecule (H2O) contains two polar O−H bonds in a bent (nonlinear) geometry. The bond dipole moments do not cancel, so that the molecule forms a molecular dipole with its negative pole at the oxygen and its positive pole midway between the two hydrogen atoms. In the figure each bond joins the central O atom with a negative charge (red) to an H atom with a positive charge (blue). The hydrogen fluoride, HF, molecule is polar by virtue of polar covalent bonds – in the covalent bond electrons are displaced toward the more electronegative fluorine atom. Ammonia, NH3, molecule the three N−H bonds have only a slight polarity (toward the more electronegative nitrogen atom). The molecule has two lone electrons in an orbital, that points towards the fourth apex of the approximate tetrahedron, (VSEPR). This orbital is not participating in covalent bonding; it is electron-rich, which results in a powerful dipole across the whole ammonia molecule. Resonance Lewis structures of the ozone molecule In ozone (O3) molecules, the two O−O bonds are nonpolar (there is no electronegativity difference between atoms of the same element). However, the distribution of other electrons is uneven – since the central atom has to share electrons with two other atoms, but each of the outer atoms has to share electrons with only one other atom, the central atom is more deprived of electrons than the others (the central atom has a formal charge of +1, while the outer atoms each have a formal charge of −​1⁄2). Since the molecule has a bent geometry, the result is a dipole across the whole ozone molecule. When comparing a polar and nonpolar molecule with similar molar masses, the polar molecule in general has a higher boiling point, because the dipole–dipole interaction between polar molecules results in stronger intermolecular attractions. One common form of polar interaction is the hydrogen bond, which is also known as the H-bond. For example, water forms H-bonds and has a molar mass M = 18 and a boiling point of +100 °C, compared to nonpolar methane with M = 16 and a boiling point of –161 °C. Nonpolar molecules[edit] A molecule may be nonpolar either when there is an equal sharing of electrons between the two atoms of a diatomic molecule or because of the symmetrical arrangement of polar bonds in a more complex molecule. Not every molecule with polar bonds is a polar molecule. Carbon dioxide (CO2) has two polar C=O bonds, but the geometry of CO2 is linear so that the two bond dipole moments cancel and there is no net molecular dipole moment; the molecule is nonpolar.
Views: 158913 Crash Chemistry Academy
POLARIMETER MOD.PL 1 ( OPTICS LAB)  IRAQ
 
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IRAQ / Qadissiya University / College of Education / Physics Department / Optics Lab .. polarimeter can be used in the chemical industry, hospitals, colleges and universities and scientific research in situations, for measuring the organic substances with optical rotation. With the aid of the disk polarimeter, the specific gravity, purity, concentration, and content of thousands of active materials, such as sugar solution, turpentine oil and camphor, can be measured.
Views: 107623 physicslove1
How to make Colorful Milk Polarity Experiment
 
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It's time for another polarity experiment! This time, we will show you simple way to learn about the polarity of different liquids. All you need is a little bit of milk, food colors, dishwashing soap and a Cotton Swab. Kids will love this activity because of a cool effect and you can experiment with different liquids to get different effects. For complete explanation of science behind experiment, visit http://www.stemlittleexplorers.com/en/make-colorful-milk-polarity-experiment/ Visit us at http://www.stemlittleexplorers.com And follow us at: Facebook https://www.facebook.com/stemlittleexplorers/ Twitter https://twitter.com/Explorers_STEM Pinterest https://www.pinterest.com/STEM_Little_Explorers/ Authors: Vedran Leder & Iva Erceg Music: "Private Eye" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/
Views: 1285 STEM Little Explorers
How To Test All Electronic Components with Multimeter | Resistor Capacitor Diode LED Transistor Fuse
 
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In this video, I have shown How to test all the basic electronics components like resistor, capacitor, diode, LED, transistor, fuse with a multimeter. As this is complete multimeter Tutorial for testing all basic electronics components you can click on the following time stamps to skip any portion of the video. 00:27 How to test with Multimeter 01:26 How to measure battery Voltage 02:06 How to measure Resistance accurately 05:33 How to measure Capacitance 08:51 How to test Diode 10:53 How to check LED 12:03 How to check the transistor NPN or PNP 14:40 How to check fuse, continuity tester After watching this tutorial video, you can test all the electronics components with a digital multimeter. During measurement, I have also shared some tips to get the accurate measurement. This video will definitely help you to understand all the features of the multimeter and how to operate a multimeter. If you have enjoyed the video please hit the like button and share it with your friends. For more such videos don't forget to SUBSCRIBE our channel and please do share your feedback in comment sections. Thank you for your Support. Find us on Facebook: https://www.facebook.com/techstudycell/ Other useful videos: How to Test Capacitors with and without Multimeter https://youtu.be/NqvL7Cyemiw How to Test MOSFET transistor using Multimeter https://youtu.be/IF740E5bm84 How to make Basic relay circuit and How a relay works https://youtu.be/clV_HtQenOk How to make 5 volt DC power supply from AC using 7805 regulator https://youtu.be/1Gbh9NA6UOs LED Basics - Polarity, Forward voltage & Current rating https://youtu.be/qoyvJHmI-_s Voltage Regulator ic 78XX Tutorial with Practical Experiments https://youtu.be/pqvDULepiFA
Views: 29278 Tech StudyCell
Water Properties, Polar nonpolar Lab
 
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Made with Explain Everything
Views: 708 Jon Lund
Optical activity | Stereochemistry | Organic chemistry | Khan Academy
 
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How optically active compounds rotate plane polarized light. Watch the next lesson: https://www.khanacademy.org/science/organic-chemistry/stereochemistry-topic/optical-activity/v/optical-activity-calculations-new?utm_source=YT&utm_medium=Desc&utm_campaign=organicchemistry Missed the previous lesson? https://www.khanacademy.org/science/organic-chemistry/stereochemistry-topic/optical-activity/v/fischer-projection-practice?utm_source=YT&utm_medium=Desc&utm_campaign=organicchemistry Organic Chemistry on Khan Academy: Carbon can form covalent bonds with itself and other elements to create a mind-boggling array of structures. In organic chemistry, we will learn about the reactions chemists use to synthesize crazy carbon based structures, as well as the analytical methods to characterize them. We will also think about how those reactions are occurring on a molecular level with reaction mechanisms. Simply put, organic chemistry is like building with molecular Legos. Let's make some beautiful organic molecules! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Organic Chemistry channel: https://www.youtube.com/channel/UCNKPjijOc0WEJ7DIV_Vay3g?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Gold Leaf Electroscope Experiment
 
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A demonstration to show how use GLE to determine 1. the presence of an electric charge on a body 2. determine the nature of the charge i.e whether the body is positively or negatively charged.
Views: 34127 Science Sir
How to identify the poles of a Magnet, North and south pole, compass
 
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Buy High Accuracy Water proof compass in Amazon Link: http://amzn.to/2Dc2GCg
Views: 12912 TECH TRAVEL EAT
Skittles Polarity Experiment
 
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Skittles Experiment, Candy Cane Experiment, Solubility, Polarity,
Views: 355 CJ Huprich
Positive and Negative Charge
 
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007 - Positive and Negative Charge In this video Paul Andersen explains how all objects contain positive and negative charge. Neutral objects contain an equal amount of positive and negative charges. Charged objects have more positive or negative charges. Like charges repel and unlike charges attract. Neutral objects can be polarized and cause attraction. Do you speak another language? Help me translate my videos: http://www.bozemanscience.com/translations/ Music Attribution Title: String Theory Artist: Herman Jolly http://sunsetvalley.bandcamp.com/track/string-theory All of the images are licensed under creative commons and public domain licensing: AJ. A Blue Balloon on a Ribbon, July 18, 2008. Open clip Art Library image's page. http://commons.wikimedia.org/wiki/File:Blue_toy_balloon.svg. ———. A Red Balloon on a Ribbon, July 18, 2008. Open clip Art Library image's page. http://commons.wikimedia.org/wiki/File:Red_toy_balloon.svg. "Balloons and Static Electricity." PhET. Accessed May 5, 2014. https://phet.colorado.edu/en/simulation/balloons.
Views: 166950 Bozeman Science
polarimeter and optical activity I dextro & laevo I meso I racemic mixture I
 
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complete description of polarimeter , How do we come to know the given substance is optically acive or not. dextro rotatory, laevo rotatory, meso compounds and racemic mixture. At 7:46 to 8:00 min there is a mistake I have written CH3 in place of OH. kindly notice and correct in your notes if you are preparing notes thank you all
Positive or Negative? How to Find Electric Charge Polarity
 
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Find out if something is positively or negatively charged using just a DIY electroscope. This determines the sign of the electrostatic charge on an electrostatically charged object. The electroscope is first inductively charged from the object being tested. Then a plastic coke bottle is used as an object with known polarity in order to do the test and is triboelectrically charged. The video showing how to make your own electroscope is: http://youtu.be/2PmWlPjV6n0 How inductive charging works video: http://youtu.be/-JsVZwc1dOo The Triboelectric effect video http://youtu.be/Fph08eKTVZM To follow me on Twitter: https://twitter.com/#!/RimStarz http://rimstar.org
Views: 102528 RimstarOrg
Molecular Geometry Lab Part 1
 
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Part of NCSSM CORE collection: This video shows part 1 of a lab using foam balls to build molecules. http://www.dlt.ncssm.edu Please attribute this work as being created by the North Carolina School of Science and Mathematics. This work is licensed under Creative Commons CC-BY http://creativecommons.org/licenses/by/3.0 Help us caption & translate this video! http://amara.org/v/GAgd/
Know your magnets polarities
 
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This video is part of a little series of videos I'm making on handling neodymium magnets safely. In this video I will show you how to determine the poles on disc, cube and sphere magnets. Knowing your magnets polarity is very useful for safely combining large magnets as shown in one of my other videos in this series. Music is by Kevin MacLeod (from his website incompetech.com) and Nick van Man (from his website music4yourvids.co.uk) used under Creative Commons license. Tracks used: 0:00 - 0:06 'Supernatural' by Kevin MacLeod ISRC: USUAN1100397 0:06 - 5:40 'Watching the sun go down' by Rick Van Man Here are the captions in case you don't understand my Danish accent: - Hi. In an earlier video I showed the advantages of knowing the polarities of your magnets. In this video I'm gonna show you how to determine the polarities of your magnets. Where is the north pole? - The professional way is to buy a dedicated pole detector. With just a click on a button it will tell you whether it's a north pole or a south pole you are pointing towards. - This is my favorite method. Use an old-school compass. - Let's start with a disc magnet as these are the easiest to determine. The poles are on the large flat surfaces. I let the magnet stand on its side so the poles are pointing towards the compass. Now I spin the magnet until the south part of the compass needle - which is actually a small magnet in itself - points towards the disc magnet. - With magnets opposite polarities attracts so now I know the north pole of my disc magnet is pointing towards the compass. I mark the north pole of the magnet with an N. And double check just for good measure. If I spin the magnet with no poles pointing towards the compass the needle doesn't move. This is valuable information for our next challenge: The cube magnet. - On a cube magnet you can't tell by the naked eye on which two surfaces the poles are. So you just have to put it randomly down. In this case I was a little unlucky and put the magnet down with its sides pointing towards the compass. Because the compass needle is not spinning along with the magnet. Therefore the poles of the magnet must be on the top and bottom surfaces and I have to tilt the magnet 90 degrees. Now the poles are pointing towards the compass and I do exactly the same as with the disc magnet. - With south pointing towards the magnet I have found the north pole of my magnet. Right here. I mark the north pole of the magnet with an N. - And now for the real challenge: The sphere magnet. Where are the poles on this one? - With a magnet that can roll in all directions it is very hard to get a steady and exact reading. The solution is to put the magnet on what I call a security board. This is just a thin wooden plate with a metal plate glued to the backside. On this board the magnet will always align with one pole pointing directly into the board and the other pole pointing directly upwards. - By now you should have figured out how to find the north pole. - The final method I am going to show you is to use the magnet as a compass in itself. In this case I'm going to use two small magnets from a play set. By hanging them on a long tension-free line the magnets will act as a compass and align with the Earth's magnetic field. I cannot force them to point in another direction. Eventually they will stop pointing in the same direction everytime. Make sure there is not metal close by - just like when you use a compass. - Here I point towards the geographic north. By definition the north pole of a magnet is the pole pointing towards the geographic north so northpole on a magnet is short for northpointing pole. That means I can mark the pole pointing towards north as the north pole. - Another version of this method is to float the magnet on some styrofoam in the middle of a waterbath. It takes a little more preparation but has much faster response time as shown. - Once you have determined the polarities of one magnet you can use it to determine it on all other magnets. The south pole of the marked magnet will stick to the north pole of your unmarked magnet.
Views: 140955 Brainiac75
Static Electricity and Water
 
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What happens when an electrically charged object is brought near a stream of water? This is an easy experiment you can do yourself that shows that water molecules are polar! [Closed Captioned]
Views: 495589 Jefferson Lab
Moisture Vs Water activity in 60 seconds
 
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Water activity is the amount of unbound water present in the sample. In other words part of the water is normally chained to chemical groups in the sample and can not move freely to be used for example by bacteria which would cause food spoilage. Water activity is based on a scale of 0 to 1.0 with pure water having a value of 1.00. It is defined as the vapour pressure of water in a sample divided by the vapour pressure of pure water at the sample temperature. As the chemically bound water can not escape only the free water will exert vapour pressure and therefore this characteristic can be used to determine microbial spoilage, chemical stability, and physical stability. For example in the majority of food samples a water activity of 0.5 will mean the likelihood of microbial growth is very low. Moisture and water activity have a unique relationship for each product. This relationship is referred to as the moisture adsorption isotherm and it must be determined experimentally by measuring water content at several water activity values. Once the isotherm has been generated, it can be used to indirectly determine moisture content based on a water activity measurement or vice versa. Visit us at Better-engineers.com for more our our video magazine.
Views: 21339 BetterEngineers
Intermolecular Forces Magic Trick
 
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Discover the magical properties of some common materials. This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers - http://elearning.flinnsci.com ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting. Be sure to subscribe and check out more videos! Subscribe: https://www.youtube.com/channel/FlinnScientific/ Facebook: https://www.facebook.com/FlinnScientific/ Website: https://www.flinnsci.com/
Views: 23493 FlinnScientific
Glucose
 
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Determining polarity for glucose (lab)
Views: 218 Barbara Fricks
Atomic Hook-Ups - Types of Chemical Bonds: Crash Course Chemistry #22
 
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Atoms are a lot like us - we call their relationships "bonds," and there are many different types. Each kind of atomic relationship requires a different type of energy, but they all do best when they settle into the lowest stress situation possible. The nature of the bond between atoms is related to the distance between them and, like people, it also depends on how positive or negative they are. Unlike with human relationships, we can analyze exactly what makes chemical relationships work, and that's what this episode is all about. If you are paying attention, you will learn that chemical bonds form in order to minimize the energy difference between two atoms or ions; that those chemical bonds may be covalent if atoms share electrons, and that covalent bonds can share those electrons evenly or unevenly; that bonds can also be ionic if the electrons are transferred instead of shared: and how to calculate the energy transferred in an ionic bond using Coulomb's Law. -- Table of Contents Bonds Minimize Energy 01:38 Covalent Bonds 03:18 Ionic Bonds 05:37 Coulomb's Law 05:51 -- Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Subbable: http://subbable.com/crashcourse
Views: 1736378 CrashCourse
06 Practical Demonstrations of Intermolecular Forces
 
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This lesson contains practical demonstrations of all the properties of substances related to their intermolecular forces that were discussed in the last lesson.
Views: 7938 Mindset Learn
Intermolecular Forces and Boiling Points
 
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Why do different liquids boil at different temperatures? It has to do with how strongly the molecules interact with each other. Find out all the different ways, and how to use them to make predictions about matter! Subscribe: http://bit.ly/ProfDaveSubscribe [email protected] http://patreon.com/ProfessorDaveExplains http://professordaveexplains.com http://facebook.com/ProfessorDaveExpl... http://twitter.com/DaveExplains General Chemistry Tutorials: http://bit.ly/ProfDaveGenChem Organic Chemistry Tutorials: http://bit.ly/ProfDaveOrgChem Biochemistry Tutorials: http://bit.ly/ProfDaveBiochem Classical Physics Tutorials: http://bit.ly/ProfDavePhysics1 Modern Physics Tutorials: http://bit.ly/ProfDavePhysics2 Mathematics Tutorials: http://bit.ly/ProfDaveMaths Biology Tutorials: http://bit.ly/ProfDaveBio American History Tutorials: http://bit.ly/ProfDaveAmericanHistory
Views: 589135 Professor Dave Explains
Polar and Nonpolar Substances Demo
 
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A simple demonstration of differences in characteristics of polar and nonpolar substances. This is a lead-in to activities related to the structure of cell membranes.
Views: 2380 rocketsgeneralbio
Leading strand vs. lagging strand
 
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Here's a little bit of info in regards to DNA synthesis and the difference between leading/lagging strand! Hope it's helpful! :)
Views: 882569 starrsumm
How to determine the melting point of naphthalene. It is class 9 chemistry practical.
 
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To determine the melting point of naphthalene. It is also called kaffor. It is used as insecticids.
Views: 4439 Abad chemist
Intermolecular Forces Lab
 
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Intermolecular Forces are forces that act between molecules rather than Interamolecular Forces which act within a molecule. These experiments show the differences in surface tension, evaporation rate, and solubility in vegetable oil in order to investigate the intermolecular forces of each fluid. Fluids used include water, isopropyl alcohol (70%), and glycerin. To follow @SpencerBPerry on Twitter go to https://twitter.com/SpencerBPerry
Views: 7009 Spencer Perry
phET Simulation on Molecule Polarity
 
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Demonstration of the phET simulation on molecule polarity.
Views: 5659 Lynette McDee
how to identify base, emitter and collector of PNP of NPN transistor
 
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you can easily identify the comman, base and emitter of PNP or NPN transistor by using of multimeter.
Views: 218876 MsArchu143
Target Stoichiometry Lab
 
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Precise technique and accurate calculations are required for success in this outcome-based stoichiometry experiment. This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers - http://elearning.flinnsci.com ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting. Be sure to subscribe and check out more videos! Subscribe: https://www.youtube.com/channel/FlinnScientific/ Facebook: https://www.facebook.com/FlinnScientific/ Website: https://www.flinnsci.com/
Views: 7338 FlinnScientific
Solubility Rules to Predict Precipitation Reactions
 
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Solubility Rules and Predictions. Mr. Causey shows you step by step how to find the products of a double replacement reaction and how to determine if a solid will precipitate out of solution. http://www.mrcausey.com SUBSCRIBE for more chemistry videos: http://bit.ly/1jeutVl ABOUT MR. CAUSEY'S VIDEO ACADEMY Mr. Causey's Video Academy is an educational video series of short video lessons for chemistry, algebra and physics. You can get lessons on a variety of topics or homework helpers that show you how to solve certain problems. There are over 100 videos to choose from. CONTACT ME: [email protected] FOLLOW ME: http://www.twitter.com/#!/mrcausey http://pinterest.com/mistercausey/ http://www.facebook.com/profile.php?id=814523544 https://plus.google.com/u/0/111105504415887392612 RESOURCES Polyatomic Ion Cheat Sheet: http://bit.ly/2RaWe6L Periodic Table: http://bit.ly/ptable9 RELATED VIDEOS: Balancing Equations: http://www.youtube.com/watch?v=Nu-wXCY0nnI Aqueous Solutions: http://www.youtube.com/watch?v=vg5FUNIrW3o Solubility Rules: https://www.youtube.com/watch?v=UbyqA5mi6GU
Views: 50526 Mr. Causey
surface tension - what is it, how does it form, what properties does it impart
 
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How does surface tension affect the surface properties of a liquid? Looking at surface tension from a particle perspective and a macro perspective from Wikipedia 1/5/2018: Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible. Surface tension allows insects (e.g. water striders), usually denser than water, to float and stride on a water surface. At liquid–air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). The net effect is an inward force at its surface that causes the liquid to behave as if its surface were covered with a stretched elastic membrane. Thus, the surface becomes under tension from the imbalanced forces, which is probably where the term "surface tension" came from.[1] Because of the relatively high attraction of water molecules for each other through a web of hydrogen bonds, water has a higher surface tension (72.8 millinewtons per meter at 20 °C) compared to that of most other liquids. Surface tension is an important factor in the phenomenon of capillarity. Surface tension has the dimension of force per unit length, or of energy per unit area. The two are equivalent, but when referring to energy per unit of area, it is common to use the term surface energy, which is a more general term in the sense that it applies also to solids. In materials science, surface tension is used for either surface stress or surface free energy. Water[edit] Several effects of surface tension can be seen with ordinary water: Beading of rain water on a waxy surface, such as a leaf. Water adheres weakly to wax and strongly to itself, so water clusters into drops. Surface tension gives them their near-spherical shape, because a sphere has the smallest possible surface area to volume ratio. Formation of drops occurs when a mass of liquid is stretched. The animation (below) shows water adhering to the faucet gaining mass until it is stretched to a point where the surface tension can no longer keep the drop linked to the faucet. It then separates and surface tension forms the drop into a sphere. If a stream of water was running from the faucet, the stream would break up into drops during its fall. Gravity stretches the stream, then surface tension pinches it into spheres.[3] Flotation of objects denser than water occurs when the object is nonwettable and its weight is small enough to be borne by the forces arising from surface tension.[2] For example, water striders use surface tension to walk on the surface of a pond in the following way. The nonwettability of the water strider's leg means there is no attraction between molecules of the leg and molecules of the water, so when the leg pushes down on the water, the surface tension of the water only tries to recover its flatness from its deformation due to the leg. This behavior of the water pushes the water strider upward so it can stand on the surface of the water as long as its mass is small enough that the water can support it. The surface of the water behaves like an elastic film: the insect's feet cause indentations in the water's surface, increasing its surface area[4] and tendency of minimization of surface curvature (so area) of the water pushes the insect's feet upward. Separation of oil and water (in this case, water and liquid wax) is caused by a tension in the surface between dissimilar liquids. This type of surface tension is called "interface tension", but its chemistry is the same. Tears of wine is the formation of drops and rivulets on the side of a glass containing an alcoholic beverage. Its cause is a complex interaction between the differing surface tensions of water and ethanol; it is induced by a combination of surface tension modification of water by ethanol together with ethanol evaporating faster than water.
What Happens when Stuff Dissolves?
 
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To see all my Chemistry videos, check out http://socratic.org/chemistry We'll look at what happens when you dissolve ionic and covalent compounds in water. Ionic compounds break apart into the ions that make them up, a process called dissociation, while covalent compounds only break into the molecules, not the individual atoms.
Views: 411164 Tyler DeWitt
Electronegativity Demonstration Device
 
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Build a simple demonstration device to demonstrate the electron tug-of-war between atoms. This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers - http://elearning.flinnsci.com ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting. Be sure to subscribe and check out more videos! Subscribe: https://www.youtube.com/channel/FlinnScientific/ Facebook: https://www.facebook.com/FlinnScientific/ Website: https://www.flinnsci.com/
Views: 3287 FlinnScientific
Determining relative solubility
 
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This video show how to use the Salts and Solubility simulation at PhET to compare solubilities of different salts.
Views: 5701 eAchieveYoung
Bonding Models and Lewis Structures: Crash Course Chemistry #24
 
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Models are great, except they're also usually inaccurate. In this episode of Crash Course Chemistry, Hank discusses why we need models in the world and how we can learn from them... even when they're almost completely wrong. Plus, Lewis Structures! -- Table of Contents Models :06 Linus Pauling & The Bonding Model 9:16 Lewis Dot Structures 4:27 Ionic Bonds 5:30 Covalent Bonds 6:10 Double Bonds 7:17 Triple Bonds 8:14 -- Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Subbable: http://subbable.com/crashcourse
Views: 1496060 CrashCourse
Magnetic Field Due to a Current in a Circular Coil
 
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Useful for CBSE, ICSE, NCERT & International Students Grade : 10 Subject :Physics Lesson :Magnetic Effect of Electric Current Topic: Magnetic Field Due to a Current in a Circular Coil A wire carrying a current generates a magnetic field B whose magnitude and direction at each point in space depend on the length and shape of the wire, the current flowing through the wire, and the location of the point at which the field is determined. Visit www.oztern.com to find personalized test preparation solutions for Pre Medical - AIPMT, AIIMS, JIPMER, State, Pre Engineering - IIT JEE, JEE MAIN, BITSAT, State and Foundations - Class 6 to 10.
Views: 149373 CBSE
Electrodes and voltage of Galvanic cell | Chemistry | Khan Academy
 
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"Identifying the anode and cathode in a galvanic cell, and calculating the voltage using standard electrode potentials. Watch the next lesson: https://www.khanacademy.org/science/chemistry/oxidation-reduction/batter-galvanic-voltaic-cell/v/shorthand-notation-for-galvanicvoltaic-cells?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry Missed the previous lesson? https://www.khanacademy.org/science/chemistry/oxidation-reduction/batter-galvanic-voltaic-cell/v/galvanic-cell-voltaic-cell?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Chemistry channel: https://www.youtube.com/channel/UCyEot66LrwWFEMONvrIBh3A?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Views: 209379 Khan Academy
Metre bridge-Resistance of a wire - MeitY OLabs
 
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This video channel is developed by Amrita University's CREATE http://www.amrita.edu/create ▶ For more Information @ http://amrita.olabs.co.in/?sub=1&brch=6&sim=146&cnt=1 ▶ Amrita Online Lab Project website http://www.olabs.edu.in/ ▶ Subscribe @ https://www.youtube.com/user/amritacreate http://www.youtube.com/amritavlab ▶ Like us @ https://www.facebook.com/CREATEatAmrita Copyright © 2016 Amrita University Developed by Amrita University & CDAC Mumbai. Funded by MeitY (Ministry of Electronics & Information Technology) Metre bridge-Resistance of a wire :- The metre bridge is operates under Wheatstone’s principle. Here, four resistors P, Q, R, and S are connected to form the network ABCD. The terminals A and C are connected to a battery, and the terminals C and D are connected to a galvanometer through keys K1 and K2 respectively. In the balancing condition, there is no deflection on the galvanometer. Then, P/Q = R/S. This video explains how to find the resistance of a given wire using a metre bridge and hence determine the specific resistance of its materials.
Views: 728508 amritacreate
Determination of Concentration of KMnO4 Solution Using Oxalic Acid - MeitY OLabs
 
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This video channel is developed by Amrita University's CREATE http://www.amrita.edu/create ▶ For more Information @ http://amrita.olabs.co.in/?sub=73&brch=8&sim=115&cnt=1 ▶ Online Labs for School lab Experiments (Olabs) http://www.olabs.edu.in/ ▶ Learn more about Amrita University http://www.amrita.edu ▶ Subscribe @ http://www.youtube.com/amritacreate https://www.facebook.com/onlinelabs Copyright © 2013 Amrita University Developed by CDAC Mumbai & Amrita University under research grant from Department of IT, Government of India Determination of Concentration of KMnO4 Solution Using Oxalic Acid :- The oxidation and reduction reactions in aqueous solutions involve the transfer of electrons from one species to another. In the oxidation of a substance electron(s) is (are) transferred from the species and in reduction, electron(s) is (are) gained by the species. Oxidation and reduction reactions occur simultaneously. A reaction, which involves simultaneous oxidation and reduction, is called a redox reaction. The titrations involving redox reaction are called redox titrations. In Redox titrations involving potassium permanganate, it acts as a powerful oxidising agent. This video explains how to determine the strength of potassium permanganate solution by titrating it against a standard solution of Oxalic acid.
Views: 286075 amritacreate
What is a schottky diode?
 
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A tutorial covering the advantages and disadvantages of schottky diodes over regular silicon diodes. 200 diodes for $8 on Amazon: http://www.amazon.com/exec/obidos/ASIN/B07BTY8FD2/afromods-20 Webpage: http://www.afrotechmods.com Twitter: http://twitter.com/Afrotechmods Facebook: http://www.facebook.com/Afrotechmods/
Views: 1062692 Afrotechmods
Lewis Diagrams and VSEPR Models
 
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022 - Lewis Diagrams and VSEPR Models In this video Paul Andersen explains how you can use Lewis Diagrams and VSEPR Models to make predictions about molecules. The Lewis diagrams are a two-dimensional representations of covalent bonds and the VSEPR models show how the molecule could exist in three dimensional space. Pi bonding and odd valence electrons require an extension of this model. Music Attribution Title: String Theory Artist: Herman Jolly http://sunsetvalley.bandcamp.com/track/string-theory All of the images are licensed under creative commons and public domain licensing: AJ. A Blue Balloon on a Ribbon, July 18, 2008. Open clip Art Library image's page. http://commons.wikimedia.org/wiki/File:Blue_toy_balloon.svg. "File:Acetic Acid Atoms.svg." Wikipedia, the Free Encyclopedia. Accessed August 18, 2013. http://en.wikipedia.org/wiki/File:Acetic_acid_atoms.svg. "File:AX4E0-3D-balls.png." Wikipedia, the Free Encyclopedia. Accessed August 16, 2013. http://en.wikipedia.org/wiki/File:AX4E0-3D-balls.png. "File:AX6E0-3D-balls.png." Wikipedia, the Free Encyclopedia. Accessed August 18, 2013. http://en.wikipedia.org/wiki/File:AX6E0-3D-balls.png. "File:Bent-3D-balls.png." Wikipedia, the Free Encyclopedia. Accessed August 17, 2013. http://en.wikipedia.org/wiki/File:Bent-3D-balls.png. "File:Linear-3D-balls.png." Wikipedia, the Free Encyclopedia. Accessed August 17, 2013. http://en.wikipedia.org/wiki/File:Linear-3D-balls.png. "File:Nitrate-ion-resonance-2D.png." Wikipedia, the Free Encyclopedia. Accessed August 17, 2013. http://en.wikipedia.org/wiki/File:Nitrate-ion-resonance-2D.png. "File:Nitrogen-dioxide-3D-vdW.png." Wikipedia, the Free Encyclopedia. Accessed August 17, 2013. http://en.wikipedia.org/wiki/File:Nitrogen-dioxide-3D-vdW.png. "File:Pi-Bond.svg." Wikipedia, the Free Encyclopedia. Accessed August 18, 2013. http://en.wikipedia.org/wiki/File:Pi-Bond.svg. "File:Sigma Bond.svg." Wikipedia, the Free Encyclopedia. Accessed August 18, 2013. http://en.wikipedia.org/wiki/File:Sigma_bond.svg. "File:Tetrahedral-3D-balls.png." Wikipedia, the Free Encyclopedia. Accessed August 17, 2013. http://en.wikipedia.org/wiki/File:Tetrahedral-3D-balls.png. "File:Trigonal-3D-balls.png." Wikipedia, the Free Encyclopedia. Accessed August 17, 2013. http://en.wikipedia.org/wiki/File:Trigonal-3D-balls.png. "File:Trigonal-bipyramidal-3D-balls.png." Wikipedia, the Free Encyclopedia. Accessed August 18, 2013. http://en.wikipedia.org/wiki/File:Trigonal-bipyramidal-3D-balls.png.
Views: 363954 Bozeman Science