answer qstins

41

Marks: 1

The decay of cesium-135 is first order with a half life is 3.0 million years.  How long (in years) would it take for a 1.4221 g sample to be reduced to 0.4529 g?

Answer:

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42

Marks: 1

The decay of cesium-135 is first order with a half life is 3.0 million years.  How much of 1.1374 g sample would remain after 9.09 million years?

Answer:

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43

Marks: 1

If the rate constant for a reaction at 72.40 oC is 0.299 s-1 and the activation energy is 31.58 kJ/mol, what is the rate constant at 120.0oC?

Answer:

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44

Marks: 1

If the rate of a reaction doubles as the temperature increases from 67.53 oC to 81.01 oC, what is the activation energy (in kJ/mol)?

Answer:

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45

Marks: 1

Activation energy decreases as temperature increases.

Choose one answer.

	a. true
	b. false

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46

Marks: 1

Activation energy increases as temperature increases.

Choose one answer.

	a. true
	b. false

Question

47

Marks: 1

As the temperature increases, the fraction of particles that have sufficient energy to overcome the activation energy increases.

Choose one answer.

	a. true
	b. false

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48

Marks: 1

As the temperature increases, the rate constant decreases.

Choose one answer.

	a. true
	b. false

Question

49

Marks: 1

As the temperature increases, the rate increases.

Choose one answer.

	a. true
	b. false

Question

50

Marks: 1

For a first order reaction, what are the units on the rate constant, k?

Choose one answer.

	a. mol/L
	b. mol/(L*s)
	c. 1/s
	d. L/(mol*s)
	e. mol2/(L2*s)

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51

Marks: 1

For a rate law of rate = k[A], what is the reaction order overall?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

Question

52

Marks: 1

For a rate law of rate = k[A], what is the reaction order with respect to [A]?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

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53

Marks: 1

For a rate law of rate = k[A]2, what is the reaction order overall?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

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54

Marks: 1

For a rate law of rate = k[A]2, what is the reaction order with respect to [A]?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

Question

55

Marks: 1

For a rate law of rate = k[A]2[B], what is the reaction order overall?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

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56

Marks: 1

For a rate law of rate = k[A][B], what is the reaction order overall?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

Question

57

Marks: 1

For a second order reaction, what are the units on the rate constant, k?

Choose one answer.

	a. mol/L
	b. mol/(L*s)
	c. 1/s
	d. L/(mol*s)
	e. mol2/(L2*s)

Question

58

Marks: 1

For a zero order reaction, what are the units on the rate constant, k?

Choose one answer.

	a. mol/L
	b. mol/(L*s)
	c. 1/s
	d. L/(mol*s)
	e. mol2/(L2*s)

Question

59

For the reaction mechanism,

A + B --> C + D (slow)

A + D --> E + B (fast)

the rate determining step is

Choose one answer.

	a. unimolecular.
	b. bimolecular.
	c. termolecular.
	d. cannot be determined.

Question

60

For the reaction mechanism,

A + B --> C + D (slow)

A + D --> E + B (fast)

what is the overall reaction?

Choose one answer.

	a. A + B --> C + D
	b. A + D --> E + B
	c. 2A --> C + E
	d. 2A + B + D --> C + D + E + B

For the reaction mechanism,

A + B --> C + D (slow)

A + D --> E + B (fast)

what is the rate determining step?

Choose one answer.

	a. A + B --> C + D
	b. A + D --> E + B
	c. 2A --> C + E
	d. 2A + B + D --> C + D + E + B

Question

62

Marks: 1

If the initial rate doubles as the concentration of [A] doubles, what is the reaction order with respect to A?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

Question

63

Marks: 1

If the initial rate is unchanged as the concentration of [A] doubles, what is the reaction order with respect to A?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

Question

64

Marks: 1

If the initial rate quadruples as the concentration of [A] doubles, what is the reaction order with respect to A?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

Question

65

Marks: 1

The reaction of A --> products is first order. Therefore, plotting what versus time will result in a straight line?

Choose one answer.

	a. [A]
	b. ln [A]
	c. 1/[A]
	d. [A]2

Question

66

Marks: 1

The reaction of A --> products is second order. Therefore, plotting what versus time will result in a straight line?

Choose one answer.

	a. [A]
	b. ln [A]
	c. 1/[A]
	d. [A]2

Question

67

Marks: 1

The reaction of A --> products is zero order. Therefore, plotting what versus time will result in a straight line?

Choose one answer.

	a. [A]
	b. ln [A]
	c. 1/[A]
	d. [A]2

Question

68

For the reaction mechanism,

A + B --> C + D (slow)

A + D --> E + B (fast)

what is the catalyst?

Answer:

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69

For the reaction mechanism,

A + B --> C + D (slow)

A + D --> E + B (fast)

what is the intermediate?

Answer:

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70

For the reaction mechanism,

A + B --> C + D (slow)

A + D --> E + B (fast)

what is the overall reaction order?

Answer:

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71

For the reaction mechanism,

A + B --> C + D (slow)

A + D --> E + B (fast)

what is the reaction order with respect to A?

Answer:

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72

For the reaction mechanism,

A + B --> C + D (slow)

A + D --> E + B (fast)

what is the reaction order with respect to B?

Answer:

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73

Marks: 1

When the concentration of a substance with a first order decay has been reduced by 1/16, how many half-lifes have elasped?

Answer:

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74

Marks: 1

When the concentration of a substance with a first order decay has been reduced by 1/4, how many half-lifes have elasped?

Answer:

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75

Marks: 1

When the concentration of a substance with a first order decay has been reduced by 1/8, how many half-lifes have elasped?

Answer:

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76

If the value of KC for the reaction of ozone to molecular oxygen is 0.00887, what is the value for the reverse reaction?

Answer:

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77

If the value of KC for the reaction:

2CO(g) + O2(g) --> 2CO2(g) is 1321,

what is the value for

CO(g) + 1/2O2(g) --> CO2(g)?

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Answer:

Question

78

If the value of KC for the reaction:

2CO(g) + O2(g) --> 2CO2(g)

is 1700, what is the value for the reverse reaction?

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Answer:

Question

79

If the value of KC for the reaction:

2NO(g) + O2(g) --> 2NO2(g) is 1829.5,

what is the value for:

NO(g) + 1/2O2(g) --> NO2(g)?

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Answer:

Question

80

If the value of KC for the reaction: 2NO(g) + O2(g) --> 2NO2(g) is 1752, what is the value for the reverse reaction?

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)