Chemistry Reveiw

Keq

100

Given the following equation and concentrations, write the equilibrium expression and solve for Keq.    

H₂(g)   +   I₂(g)   ⇄   2 HI(g)

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

Keq = 0.0016/0.0013

Keq = 1.23

200

CO + H₂O <--> CO₂ + H₂

For this reaction, the value of Keq = 0.400. At equilibrium, the following concentrations were obtained: [CO] = 4.56, [H2O] = 2.34, [CO2] = ?, [H2] = 6.9   What is the equilibrium concentration of CO2?

[CO2] = 0.619 M

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)

This equilibrium has a value of Keq = ???.    If 7.0 moles of XY are injected into a 2.5 L container at 25°C , and reaches equilibrium with a concentration of 2M,  find the equilibrium Keq.  

Keq = 0.04

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)

400

H2(g)+I2(g)⇌2HI(g)

At a certain temperature, the equilibrium constant Keq is 49.0.

Initially, a container holds 1.00 M H₂ and 1.00 M I₂. What are the concentrations at equilibrium?

• [H2]=[I2]=1.00−x=0.222M

• [HI] = 2x = 1.556,

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

What other course does Mrs. OConnor teacher?

AP Biology

200

What is my birthday month?

March!

300

What year was the START of Stevenson High School?

1965