Chapter 12- Kinetics

A) 1.1 × 10-4

B) 2.2 × 10-4

C) 2.8 × 10-4

D) 4.4 × 10-4

E) 5.5 × 10-4

A)

B)

C)

D)

E) All of the above are valid expressions of the reaction rate.

A) mol L-1s-1

B) L mol-1s-1

C) mol2 L-2s-1

D) mol L-1s-2

E) L2 mol -2s-1

A) is the time necessary for the reactant concentration to drop to half its original value

B) is constant

C) can be calculated from the reaction rate constant

D) does not depend on the initial reactant concentration

E) All of the above are correct.

A) 0.096

B) 0.65

C) 0.81

D) 1.2

E) 0.54

A) 65 minutes

B) 120 minutes

C) 145 minutes

D) 180 minutes

E) 198 minutes

A) 2.4

B) 0.27

C) 0.24

D) 1.4

E) 1.2 × 10-2

A) 0.693

B) 3.08 × 10-3

C) 1.25

D) 12.5

E) 4.44 × 10-3

A) the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0

B) the rate of both first-order and second-order reactions do not depend on reactant concentrations

C) the rate of a first-order reaction depends on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations

D) a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed

E) None of the above are true.

A) k[N2O5]2

B)

C) k[N2O5]

D)

E)2k[N2O5]

A) reactant molecules collide less frequently

B) reactant molecules collide more frequently and with greater energy per collision

C) activation energy is lowered

D) reactant molecules collide less frequently and with greater energy per collision

E) reactant molecules collide more frequently with less energy per collision

A) collision frequency

B) collision energy

C) collision orientation

D) all of the above

E) none of the above

A) product

B) activated complex

C) activation energy

D) enthalpy of reaction

E) atomic state

A) goes up if the reaction is exothermic

B) goes up if the reaction is endothermic

C) goes up regardless of whether the reaction is exothermic or endothermic

D) stays the same regardless of whether the reaction is exothermic or endothermic

E) stays the same if the reaction is first order

A) A

B) B

C) C

D) D

E) X

A) If we know that a reaction is an elementary reaction, then we know its rate law.

B) The rate-determining step of a reaction is the rate of the fastest elementary step of its mechanism.

C) Since intermediate compounds can be formed, the chemical equations for the elementary reactions in a multistep mechanism do not always have to add to give the chemical equation of the overall process.

D) In a reaction mechanism, an intermediate is identical to an activated complex.

E) All of the above statements are true.

A) increasing the concentrations of reactants

B) raising the temperature of the reaction

C) adding a catalyst for the reaction

D) removing products as the reaction proceeds

E) increasing the pressure

A) by changing the value of the frequency factor (A)

B) by increasing the overall activation energy (Ea) of the reaction

C) by lowering the activation energy of the reverse reaction

D) by providing an alternative pathway with a lower activation energy

E) All of these are ways that a catalyst might act to increase the rate of reaction.

A) there is so little nitrogen in the atmosphere

B) nitrogen exists in the atmosphere primarily as its oxides which are very unreactive

C) nitrogen is very unreactive, largely due to its triple bond

D) of the extreme toxicity of nitrogen

E) of the high polarity of nitrogen molecules preventing them from dissolving in biological fluids, such as those inside cells

A) -2/3

B) +2/3

C) -3/2

D) +1

E) +3/2

A) NH3

B) O2

C) NO2

D) H2O

E) The rates of appearance/disappearance are the same for all of these.

A) doubles

B) remains unchanged

C) triples

D) increases by a factor of 4

E) is reduced by a factor of 2

A) 8.2

B) 11

C) 3.6

D) 0.048

E) 8.4

A) 7.8 × 10-2

B) 3.8 × 10-2

C) 2.0 × 10-2

D) 1.3

E) 18

A) 3.85

B) 0.0650

C) 0.0169

D) 0.260

E) 0.0860

A) 2.3 × 10-5

B) 4.5 × 10-5

C) 9.0 × 10-5

D) 4.5 × 10-3

E) 9.0 × 10-3

A) 0.0276 M

B) 0.0324 M

C) 0.0353 M

D) 0.0480 M

E) 0.0402 M

A) 9.56 × 103

B) 2.85 × 104

C) 576

D) 4.33 × 1087

E) 1.36 × 102