Ch. 14 ap & 17 kinetics & equilibirum **test ** [70 points] Chemistry

Show your work in an organized manner, includes any relevant equation / formula, proper units in your work / answer, and the proper number of significant figures in your answer.

1. In the reaction: SO _{2} + O _{2} --> SO _{3} ; if , then [10 points]

a.

b.

2. Write the algebraic expression for the equilibrium constant, K _{c}, in the following chemical reaction. [10 points]

a. HCl

_{(aq)}+ Ca(OH)_{2 (aq)}<--> CaCl_{2 (aq)}+ H_{ 2}O_{(l)}b. Na

_{2}CO_{3 (aq)}+ Cu(NO_{3})_{2 (aq)}<--> CuCO_{3 (s)}+ NaNO_{3 (aq)}

3. The activation energy of a forward reaction is 75 kJ / mole and ∆H is 35 kJ/mole. Based on this information, [10 points]

a. sketch and label the reaction energy profile

b. calculate the activation energy of the backward reaction

4. The chemical reaction: H _{2 (g)} + I _{2 (g)} <--> 2 HI _{(g) } ∆ H > 0 at equilibrium was disturbed by ___; what is the effect on [H _{2}] and[HI] ? Justify your answer. [15 points]

a. increase the volume of the system

b. cool the system

c. remove I

_{2}

5. Determine the rate law (i.e. the value of the exponents & rate constant) of the reaction

N

_{2 (g)}+ 3 H_{2(g)}--> 2 NH_{3 (g)}

based on the following (hypothetical) experimental data. [15 points]

Experiment #

[N

_{2}] (M)[H

_{2}] (M)Rate (mM / second)

1

2.0

2.0

1.0

2

2.0

6.0

4.0

3

4.0

2.0

2.0

6. H_{ 2 (g)} + I _{2 (g)} <--> 2 HI _{(g)} K _{c} = 9.0

Determine the equilibrium concentration of HI, if the initial concentration of H _{2} and I _{2} are 2.0 M, while the initial concentration of HI is 0. [10 points]