15.1 Chemical Equilibrium and Equilibrium Constants | General Chemistry

Chad provides a comprehensive lesson on Equilibrium and Equilibrium Constants. First, what is meant by a dynamic equilibrium. When a reaction reaches equilibrium, it is not that the reaction has stopped completely, it is just that it is proceeding in both the forward and reverse directions at the same rate (Forward Rate = Reverse Rate).
Second, equilibrium constants (K) and the law of mass action are introduced. Equilibrium constant expressions are first defined as the ratio of the concentrations of products to reactants and how that typically only aqueous and gaseous species are included. The difference between Kc and Kp is also explained as the equilibrium constant can be written in terms of molar concentrations or partial pressures for reactions involving gases. How to calculate Kp having been given Kc is also demonstrated using a provided equation.
Finally, being given an equilibrium constant for a reaction, it is shown how to determine the equilibrium constant for reactions that are related to the first by a simple stoichiometric ratio (reducing all coefficients by half for instance).
I've embedded this playlist as a course on my website with all the lessons organized by chapter in a collapsible menu and much of the content from the study guide included on the page. Check this lesson out at www.chadsprep.com/chads-gener...
If you want all my study guides, quizzes, final exam reviews, and practice exams, check out my General Chemistry Master Course (free trial available) at www.chadsprep.com/genchem-you...
00:00 Lesson Introduction
00:28 Introduction to Dynamic Equilibrium
02:36 Introduction to Equilibrium Constants
14:42 Kc vs Kp
22:22 Calculating Equilibrium Constants of Related Reactions
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[@ilovegojosomuch]

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You're very wlcome - Glad the channel has helped you so much!

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You're welcome and Thank You!

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Anyone else like Chad's videos before they even watch them?

[@ChadsPrep]

Thanks for the support :)

[@civicstestandn-400applicat3]

Thank you so much! You have been explaining concepts a lot better than my professor. Please continue posting and I look forward to your biochemistry playlist!

[@ChadsPrep]

You're welcome - glad to hear it!

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[@ChadsPrep]

You're welcome and Thank You!

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[@ChadsPrep]

Glad you found us - Happy Studying!

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Glad to hear it!

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Thank You!

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Amazing Video Professor Chad. Thank you! 🧪

[@ChadsPrep]

You're welcome, Matt - Happy Studying!

[@mahnoorrashid7846]

if concentration of product and reactant are not equal then how how rate is equal although rate depends on concentration ?

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[@ChadsPrep]

Thanks from USA - Happy Studying!

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Glad to hear it!

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[@ChadsPrep]

Thanks for your kind words - you should check out my playlists - I have 2 for Organic Chemistry.

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[@ChadsPrep]

Glad the channel is helping you.

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[@ChadsPrep]

You're welcome, Malatins - glad you find them helpful!

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[@ChadsPrep]

Most welcome.

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[@ChadsPrep]

You're welcome - all the best.

[@araitol3935]

20:57 how do you know which one is final and initial if it's in equilibrium.

[@ChadsPrep]

Even at equilibrium we have reactants and products, the final is referring to the moles of gas in products and initial is the moles of gas in reactants

[@TheIzaya100]

Chad do you perhaps a playlist for Biochem? I just started Biochem this semester and I am seeing that it at first is going back to a lot of gen chem math stuff (something I was never really strong at) and was wondering what you think would be good to watch so I can learn that dimenional analysis? Also you are really amazing your one of the reasons I was able to get a B in my ochem 2 class last semester so thank you!

[@ChadsPrep]

I don't have a biochem playlist on youtube (hope to add an updated one next year), but I do have a free one on my website here: www.chadsprep.com/chads-elementary-biochemistry-videos/ You might also consider watching the video in chapter 17 of my old gen chem playlist on buffers too. Hope this helps!

[@TheIzaya100]

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@@TheIzaya100 You're welcome!

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[@user-vl1bk9jh4h]

Sir g again thank you so much

[@ChadsPrep]

You're welcome

[@sibonginkosizikhali4471]

how do see if a reaction's kp is equal kc

[@ChadsPrep]

If I forgot to mention it in the video, I definitely intended to, but Kp and Kc will only be equal if there are an equal number of moles of gas on both the reactants' and products' sides of the reaction. Hope this helps!

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[@ChadsPrep]

Thank you very much - and you as well!

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[@ChadsPrep]

Thank you

[@ilonkaulrich2665]

Can't you multiply the halved equation by 2 instead of doing the square root?

[@ChadsPrep]

At what time in the video?

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Grateful

[@ChadsPrep]

Glad you found the channel, Victor!

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[@ChadsPrep]

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[@ChadsPrep]

Indeed - Well said.