1. The reaction

2NO

was studied by measuring its initial rate for varying initial concentrations of NO

Expt. # | [NO_{2}]_{initial} | [F_{2}]_{initial} | Rate |

1 | 0.0125 M | 0.0253 M | 0.0560 M / s |

2 | 0.0250 M | 0.0253 M | 0.1120 M / s |

3 | 0.0125 M | 0.0506 M | 0.1120 M / s |

a) Rate = 215 M

b) Rate = 385 M

c) Rate = 514 M

d) Rate = 177 M

e) Rate = 673 M

2. The reaction

2NO

was studied by measuring its initial rate for varying initial concentrations of NO

Expt. # | [NO_{2}]_{initial} | [F_{2}]_{initial} | Rate |

1 | 0.0125 M | 0.0253 M | 0.0280 M / s |

2 | 0.0250 M | 0.0253 M | 0.0560 M / s |

3 | 0.0125 M | 0.0506 M | 0.0560 M / s |

a) Rate = 88.5 M

b) Rate = 12.5 M

c) Rate = 12.5 M

d) Rate = 38.7 M

e) Rate = 42.8 s

3. The reaction

2NO

was studied by monitoring its initial rate under varying conditions of reactant concentrations. The results of three such experiments are presented in the following table:

Expt. # | [NO_{2}]_{initial} | [F_{2}]_{initial} | Rate |

1 | 3.4 x 10^{-3} M | 3.2 x 10^{-3} M | 1.8 x 10^{-5} M/s |

2 | 6.8 x 10^{-3} M | 3.2 x 10^{-3} M | 3.6 x 10^{-5} M/s |

3 | 3.4 x 10^{-3} M | 6.4 x 10^{-3} M | 3.6 x 10^{-5} M/s |

a) R = (1.65 / M s) [NO

b) R = (487 / M2 s) [NO

c) R = (517 / M2 s) [NO

d) R = (1.52 x 10

e) R = (1.43 x 10

4. What statement can be made about the chemical reaction in problem 3?

a) The reaction definitely MUST be elementary

b) The reaction definitely must NOT be elementary

c)The reaction could possibly be elementary, but we can't be sure

5. The reaction

2NO(g) + H

was studied by the initial rate method to determine the rate law. The following table gives the results of three experiments, all conducted at the same temperature. Determine the orders of reaction with respect to NO and H

Expt. # | [NO]_{0} | [H_{2}]_{0} | Rate |

1 | 1.17 x 10^{-3} M | 4.30 x 10^{-3} M | 1.05 x 10^{-5} M/s |

2 | 3.51 x 10^{-3} M | 4.30 x 10^{-3} M | 9.45 x 10^{-5} M/s |

3 | 1.17 x 10^{-3} M | 8.60 x 10^{-3} M | 4.20 x 10^{-5} M/s |

6. Based on the rate law you determined for the reaction in problem 5, which of the following is a correct statement? (Note: Base your answer solely on your rate law, and the reaction given in the problem, and not on the reasonableness that such a reaction could actually occur in a single step. The problem may be using a ficticious reaction and / or ficticious data.

a) The reaction in problem 5 definitely MUST be elementary

b) The reaction in problem 5 definitely must NOT be elementary

c) The reaction in problem 5 could possibly be elementary, but we can't be sure

7. The reaction

SO

is first order with respect to SO

a) 0.002 mol / L b) 0.014 mol / L c) 0.024 mol / L

d) 0.0305 mol / L e) 0.0312 mol / L

8. If a chemical reaction occurs 2 times faster at 40

a) 21.5 kJ / mol b) 33.8 kJ / mol c) 41.2 kJ / mol

d) 54.7 kJ / mol e) 72.1 kJ / mol

ANSWERS:

1 d 2 a 3 a 4 b

5 R = 4.15 x 10

6 b 7 c 8 d