Question 51 : For a certain reaction, it is found that the equation relating the specific rate constant, k(M/s), and absolute temperature, T, is: lnk = -4420/T + 120. What is the value of the specific rate constant, k(M/s) at 500 K?
1. 28.8
2. 204
3. 36
4. 10.4
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Question 52 : What is the activation energy, in kJ/mole, for the process described in problem 9?
1. -36.7
2. 36.7
3. -42
4. 42
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Question 53 : For a certain first order reaction, it is found that it takes 156 seconds for the concentration of reactant to fall from 0.100 M to 0.0500 M. How much time would it take for the concentration of reactant to fall from 0.0500 M to 0.0250 M?
1. 156
2. 76
3. 15
4. 312
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Question 54 : A 000 g sample of live grass gives 116 decays per hour of carbon-1 A 000 g sample of grass found in an Egyptian tomb gives 34 decays per hour. The half-life of carbon-14 is 5720 years. How old, in years, is the ancient grass?
1. 19500
2. 1680
3. 10100
4. 7020
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Question 55 : For a certain reaction, it is found that the rate equation is R = 0.015 L/mol·s[A][B] Calculate the rate of the reaction, in mol/L·s, when [A] = 0.022 M and [B] = 0.055 M.
1. 0 x 10^-6
2. 0 x 10^-7
3. 5 x 10^-2
4. 8 x 10^-5
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Question 56 : The reaction A + B -> products is found to be second order in [A] and first order in [B]. The rate equation would be:
1. R = k[A]²[B]
2. R = k[A][B]²
3. R = k[B]
4. R = k[A][B]
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Question 57 : Which of the following would NOT increase the rate of reaction
1. adding a catalyst
2. increasing the concentration of reactants
3. raising the temperature
4. increasing the volume of the container for a gaseous reaction.
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Question 58 : For the reaction 2A + 3B + C = Products, the rate equation is
1. R = k[A]²[B]³[C]
2. R = k[A][B][C]
3. R = k[A]²
4. Insufficient information to fix rate equation
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Question 59 : Which of the following compound is depleting the ozone umbrella?
1. Bromomethane
2. Chloroform
3. chlorofluorocarbons
4. None
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Question 60 : The term — dx/dt in the rate expression refers to the?
1. instantaneous rate of the reaction
2. Average rate of the reaction
3. increase in concentration of the reactants
4. Change in concentration of. the reactants with time
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