Chemistry Reveiw

Keq

100

Given the following equation and concentrations, write the equilibrium expression.   

H₂(g)   +   I₂(g)   ⇄   2 HI(g)

[HI]^2/[I2][H2]

200

Given the following equation and concentrations, solve for Keq.    

H₂(g)   +   I₂(g)   ⇄   2 HI(g)

[H2] = 0.05 M, [I2] = 0.026 M, [HI] = 0.04 M

Keq = 1.23

300

1. Consider the following equation:

6 CO2(g) + 6 H2O(g)  ⇄ C6H12O6(s) + 6 O2(g)

Assume the reaction is carried out in a 6.0 liter jug and sat long enough so that the reaction reached equilibrium.  The moles at equilibrium are CO2 = 0.025, H2O = 0.003, O2 = 4.0 x 10^-5.  

Determine the numeric value for the equilibrium constant, Keq.

Keq = 1054.71

ICE

100

1. Consider the following reaction:     

 2 XY(g)    ⇄     X2(g)    +     Y2(g)

If you put 2 moles of XY in a 10 L jar, fill in the I and the C of the ICE table

I     0.2.    0.     0. 

C    -2x   +X    +X

200

There are 8 moles of A and 10 moles of B in a 2.0 L solution. At equilibrium [D] = 2 M. Solve for Keq. Are products or reactants favored?

2A (g) + 3B (aq) ⇄ C(l) + 2D (g)

Keq = 0.125 

Reactants Favored

300

In a container of 1.0 L volume, I mix 1.0 mol N2, 1.0 mol H2 and 0.5 mol O2. Write an ICE table when the equilibrium concentration of N2H4 is 0.1M.  Are reactants or products favored?

N2(g) + 4 H2(g) + O2(g) <--> N2H4(g) + 2 H2O(g)

Keq = 0.087 (REACTANTS)

Modeling

100

Draw a particulate that models a Keq greater than one.

Reaction --> A + B = AB

More AB than A and B.

200

In a Concentration vs. Time graph, when the lines intersect, what does that signify? When do you know if equilibrium has been established?

1) Intersection = equal concentration

2) Equilibrium = No longer changing concentration

300

3 H2 (g) + N2 (g) <--> 2 NH3 (g)

1. Initially, you place 8 moles of H2 and 6 moles of N2 in a 2.0 L container. At equilibrium, the concentration of NH3 is 2 M. Find all the equilibrium concentration of all chemicals and then produce a particulate model showing what is in the container at equilibrium.

2 moles of H2, 4 moles of N2, 4 mole of NH3

Fun Facts

100

On average, how many times does a human fart in a day?

14 times

200

What is Deppong's dream job?

Comedic actor (like on SNL)

300

What year was Mr. Deppong born?

1979