Ch. 14 ap & 17 kinetics & equilibirum **test ** [80 points] Honors 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 {Δ [SO_{2}] / Δ time = - 1.0 mM / second}, then [10 points]

a. {Δ [O

_{2}] / Δ time} = ___________b. {Δ [SO

_{3}] / Δ time} = _________

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)}<-->b. mix aqueous solutions of sodium carbonate and copper (II) nitrate.

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. If the solubility of calcium phosphate is 1.0 µM, then its K_{ sp} = ___. [10 points]

7. 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}, I _{2}, and HI are 1.0 M, 2.0 M, and 3.0 M respectively. [10 points]