Before Monday, Jan. 30,
- Please watch the 5 videos below.
- Follow along and take notes on the blank notes
- Make a comment.
7.1 a Equilibrium and equilibrium expressions
7.2 Equilibrium can be reached from either direction
7.1 c– This video is edited into 2 parts. It may end abruptly. The next part is in the following video.
7.1 c Part 2 — This is the second part of the above video. It may start abrubptly.
chemistry matters 
In these videos I learned about equilibrium. Reactions can exist both in the forward and reverse directions. As a reaction progresses the rate of forward reaction decreases and the rate of reverse reactions increases until the reaction arrives at equilibrium, or the state at which forward and reverse reactions occur at the same rate. Equilibrium can differ depending on the temperature. We write the equation for a system at equilibrium using a double arrow, and find the equilibrium constant by dividing the products to the power of their coefficients by the reactants to the power of their coefficients. Since pressure is proportional to concentration, an equilibrium constant can be found using pressures instead of concentrations. The value of k can tell us if more products or reactants exist at equilibrium and relatively to what extent. We also need to sometimes manipulate the equilibrium constants. For example, if we must double everything in the reaction, we have to raise the equilibrium constant to the second power. If we have to use the reverse reaction, the equilibrium constant will be the inverse of the original and if we add two reactions together, we must multiply their rate constants
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In this lesson, I learned what an equilibrium constant is and how to write the equilibrium constant expression for a reaction. There are three ways to manipulate equilibrium constants: reversing, multiplying, adding. If the reaction is manipulated, the constant is manipulated.
I didn’t quite understand how we analyzed heterogenous equilibrium.
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In these videos, I’ve learned that equilibrium is when the forward and reverse reactions happen at the same rate. I’ve learned of the equilibrium constant expression for concentration and pressure. I’ve also learned of heterogeneous equilibrium (equilibrium with substances of different states).
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