1. ANSWER ALL QUESTIONS
1. The data below were collected for the reaction: BrO3
–
+ 5 Br–
+ H3O+
→ 3 Br2 + 9 H2O
Exp Initial Concentration of Reactants (mol/L) Initial Rate (mol/L•s)
BrO3
–
Br–
H3O+
1 0.10 0.10 0.10 1.2
2 0.20 0.10 0.10 2.4
3 0.10 0.30 0.10 3.6
4 0.20 0.10 0.15 5.4
a. Determine the rate law for this reaction.
b. Calculate the value of k for this reaction and express it with the correct units.
Chemistry Unit
Session 2013/2014
Semester 2
Sample QUIZ Paper
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2. 2. The data below were collected for the reaction at 327 °C: H2 (g) + I2 (g) → 2 HI (g)
Experiment Initial [H2], M Initial [I2], M Initial Rate, mol/L•s
1 0.113 0.110 3.01 x 10–4
2 0.220 0.330 1.76 x 10–3
3 0.550 0.110 1.47 x 10–3
a. Determine the rate law for this reaction.
b. Calculate the value of k for this reaction and express it with the correct units.

3. Answer:
1.a. Rate = k[BrO3
–
][Br–
][H3O+
]2
note: you will not receive full credit if you only write k[BrO3
–
][Br–
][H3O+
]2
, of if you
capitalize K (that’s a different constant!), or if you write in the value of k instead of just
k. The great thing about a rate law is that it works at any temperature, but k is different at
different temperatures.
b. k = 1.2 x 104
L3
/mol3
s
2 .a. Rate = k[H2][I2]
b. k = 0.0243 L/mol s