The exponents in a rate law describe the effects of the reactant concentrations on the reaction rate and define the reaction order. Consider a reaction for which the rate law is: rate = k[A]m[B]n If m is 1, the reaction is first order with respect to A. If the exponent is 2, the reaction is second order with respect to A. If n is 1, the reaction is first order in B. If m or n is zero, the reaction is zero order in A or B. If m = 1 and n = 1, the overall order of the reaction is second. (m + n = 1 + 1 = 2). 1. What is the difference between a reaction rate and a reaction's rate constant? 2. What does it mean if a reaction is zero order with respect to a reactant? 3. Doubling the concentration of a reactant increases the rate of a reaction four times. What is the order of the reaction with respect to that reactant? 4. Doubling the concentration of a reactant increases the rate of a reaction four times. Tripling the concentration of a different reactant increases the rate of a reaction three times. What is the order of the reaction with respect to that reactant? 5. H2 (g) + 2 NO (g) → N2O (g) + H2O (g) The rate law for this reaction has been determined experimentally and, under certain conditions, was found to be: rate = k[NO]2[H2] The overall rate of this reaction is 6. CH3OH + CH3CH2OCOCH3 → CH3OCOCH3 + CH3CH2OH Write the rate law for this reaction if this reaction has a rate order of zero with respect to ethyl acetate (CH3CH2OCOCH3) and a rate order of 1 with respect to methanol (CH3OH). 7. CO (g) + NO2 (g) → CO2 (g) + NO (g) If the pressure of NO2 is decreased from 0.50 atm to 0.250 atm, describe how the reaction rate will change. 8. CO (g) + NO2 (g) → CO2 (g) + NO (g) If the concentration of CO is increased from 0.01 M to 0.03 M, describe how the reaction rate will change. Justify your answer.
The exponents in a rate law describe the effects of the reactant concentrations on the
If m is 1, the reaction is first order with respect to A. If the exponent is 2, the reaction is second order with respect to A. If n is 1, the reaction is first order in B. If m or n is zero, the reaction is zero order in A or B.
If m = 1 and n = 1, the overall order of the reaction is second. (m + n = 1 + 1 = 2).
1. What is the difference between a reaction rate and a reaction's rate constant?
2. What does it mean if a reaction is zero order with respect to a reactant?
3. Doubling the concentration of a reactant increases the rate of a reaction four times. What is the order of the reaction with respect to that reactant?
4. Doubling the concentration of a reactant increases the rate of a reaction four times. Tripling the concentration of a different reactant increases the rate of a reaction three times. What is the order of the reaction with respect to that reactant?
5. H2 (g) + 2 NO (g) → N2O (g) + H2O (g) The rate law for this reaction has been determined experimentally and, under certain conditions, was found to be: rate = k[NO]2[H2] The overall rate of this reaction is
6. CH3OH + CH3CH2OCOCH3 → CH3OCOCH3 + CH3CH2OH Write the rate law for this reaction if this reaction has a rate order of zero with respect to ethyl acetate (CH3CH2OCOCH3) and a rate order of 1 with respect to methanol (CH3OH).
7. CO (g) + NO2 (g) → CO2 (g) + NO (g) If the pressure of NO2 is decreased from 0.50 atm to 0.250 atm, describe how the reaction rate will change.
8. CO (g) + NO2 (g) → CO2 (g) + NO (g) If the concentration of CO is increased from 0.01 M to 0.03 M, describe how the reaction rate will change. Justify your answer.
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