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Quiz 8

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NCAT Practice Test - Practice Test - Chemistry - Reaction Kinetics Quiz

Attempt 10 MCQs on NCAT Practice Test - Practice Test - Chemistry - Reaction Kinetics | Quiz 8

71. How is k calculated from concentration-time data for a second-order reaction?

k = (1/[A]_t - 1/[A]_0)/t
k = (ln[A]_0 - ln[A]_t)/t
k = ([A]_0 - [A]_t)/t
k = ([A]_t - [A]_0)/t

72. What can be determined from temperature dependence of k?

Activation energy
Frequency factor
Order
Equilibrium constant

73. What are the units of k for a zero-order reaction?

M/s
1/s
1/(M s)
M^2/s

74. What does the slope represent in a ln[A] vs t plot for first-order?

Negative slope
Positive slope
Intercept
Curvature

75. How does k vary with temperature?

Exponentially
Linearly
Inversely
Logarithmically

76. How does a catalyst affect rate constant k?

Increases k
Decreases k
No change in k
Increases equilibrium constant

77. What physical meaning does the factor A have?

Collision frequency and orientation
Activation energy
Temperature
Reaction order

78. What is the correct ratio expression?

k2/k1 = e^{Ea/R (1/T1 - 1/T2)}
k2/k1 = e^{Ea/R (1/T2 - 1/T1)}
k2/k1 = (Ea/R)(1/T1 - 1/T2)
k2/k1 = (Ea/R)(T2 - T1)

79. What is the approximate k for N2O5 decomposition at room temperature?

3.4 x 10^{-5} s^{-1}
1.2 x 10^{-4} s^{-1}
2.2 x 10^{-2} s^{-1}
0.1 s^{-1}

80. Which method uses initial rate measurements to find k and orders?

Initial rates method
Integrated rate method
Half-life method
Isolation method

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