Chemistry Review

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 (g) + H₂O (g) <--> CO₂ (g)+ H₂ (g)

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)

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

Where did Mrs. Rose obtain her undergraduate degree in Neuroscience and Psychology?

Vanderbilt University

200

What are the names of Mrs. Rose's 3 children?

Maya, Taylor, Evelyn

300

What year was the START of Stevenson High School?

1965