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 [SO2] / Δ time = - 1.0 mM / second}, then [10 points]
a. {Δ [O2] / Δ time} = ___________
b. {Δ [SO3] / 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]