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Polar & Non-Polar Molecules: Crash Course Chemistry #23

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10 vistas · 7 años hace

*** PLEASE WATCH WITH ANNOTATIONS ON! SOME INACCURACIES IN GRAPHICS ARE NOTED AND CORRECTED IN ANNOTATIONS. THANKS! ***

Molecules come in infinite varieties, so in order to help the complicated chemical world make a little more sense, we classify and categorize them. One of the most important of those classifications is whether a molecule is polar or non-polar, which describes a kind of symmetry - not just of the molecule, but of the charge. In this edition of Crash Course Chemistry, Hank comes out for Team Polar, and describes why these molecules are so interesting to him.
You'll learn that molecules need to have both charge asymmetry and geometric asymmetry to be polar, and that charge asymmetry is caused by a difference in electronegativities. You'll also learn how to notate a dipole moment (or charge separation) of a molecule, the physical mechanism behind like dissolves like, and why water is so dang good at fostering life on Earth.

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Table of Contents
Charge Assymetry & Geometric Asymmetry 01:33
Difference in Electronegatives 01:49
Hank is Team Polar 00:33
Dipole Moment 03:49
Charge Separation of a Molecule 04:12
Like Dissolves Like 04:41
Water is Awesome 05:10

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Fungi: Death Becomes Them - CrashCourse Biology #39

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10 vistas · 7 años hace

Death is what fungi are all about. By feasting on the deceased remains of almost all organisms on the planet, converting the organic matter back into soil from which new life will spring, they perform perhaps the most vital function in the global food web. Fungi, which thrive on death, make all life possible.

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Table of Contents
1) Biolography 02:07
2) Structure 04:53
3) The Decomposers 06:10
4) The Mutualists 06:38
5) The Predators 07:23
6) The Parasites 07:35
7) Reproduction 08:24

References for this episode can be found in the Google document here: http://dft.ba/-2i0c

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Globalization and Trade and Poverty: Crash Course Economics #16

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10 vistas · 7 años hace

What is globalization? Is globalization a good thing or not. Well, I have an answer that may not surprise you: It's complicated. This week, Jacob and Adriene will argue that globalization is, in aggregate, good. Free trade and globalization tend to provide an overall benefit, and raises average incomes across the globe. The downside is that it isn't good for every individual in the system. In some countries, manufacturing jobs move to places where labor costs are lower. And some countries that receive the influx of jobs aren't prepared to deal with it, from a regulatory standpoint. Anyway, Jacob and Adriene can explain the whole thing to you in 10 minutes.

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