The Reaction Quotient

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063 - The Reaction Quotient

In this video Paul Andersen explains how the reaction quotient is used to determine the progress of a reversible reaction. The reaction quotient (Q) is the ratio of the concentration of products to the concentration of reactants. The reaction quotient will equal the equilibrium constant when the reaction is at equilibrium. Model and graphical analysis of Q is included.

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Music Attribution
Title: String Theory
Artist: Herman Jolly

All of the images are licensed under creative commons and public domain licensing:
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Awesome video! My teacher suggested that putting K>Q, the arrow pointing to the right indicates a right shift while K<Q, the arrow points to the left indicating a left shift. I just think that this helps remember it in an easier manner.

istarzgirl
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We have 2 hours of lecture for this and I did not understand anything. 7 minutes here and I got it. So thank youuu

microbiologeest
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Amazing video! All my students loved watching you teach them about equilibrium.

mariamasankay
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Amazingly so. Wow...that was an amazing job of explaining that. I've always struggled with remembering what to do with Q and K - this helped me understand the ratio and relationship between them. Excellent work. Thanks.

NexusEden
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I always watch your video when I get stock. Thank you very much!! You are the best!!!

Quai
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Wow, this video was such a great help. I had oversimplified the concept in my mind to K = products and Q = reactants. Clearly this assumption was incorrect. 

irule
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Thanks again for all the very helpful videos and cool animations.

someoneOnYoutube
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Hello, Mr Anderson, will you add all these chemistry videos into a playlist?
Thanks for all your wonderful teaching!

jeremysamuels
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Geez, you make it easy. Why can't you be my chem instructor?

kikik
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for the problem at the end, why is the change in M for H2O 0.038 when it changed from 0 to 0.138?

Ange-ornp
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Hi Mr. Anderson,

Could you please expand on why we can only calculate reaction quotients for a homogeneous equilibrium reaction? I asked my AP Chem teacher about this, and he said it shouldn't be the case. What is the reasoning behind this? Thank you!

CliffLiuHD
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excuse me where did that 0.138 come from? I thought it would be 0.038 or am I mistaken?

Cjkhaled
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What if we have more than one reactant and more than one product?

bonbonpony