RATE OF REACTION AND RATE LAWS MULTIPLE CHOICE TEST

Select the best answer:
1. It is the change in the concentration of reactants or products per unit of time.
          a.  Rate law
          b.  Rate constant
          c.  Rate of reaction
          d.  Instantaneous rate
2.  Which of the following is the unit of reaction rate?
          a.  M/s
          b.  m/s
          c.   M/s²
          d.  m/s²
3. Which of the following is not a factor affecting reaction rate?
          a.  Temperature
          b.  Pressure
          c.  Concentration of Reactants
          d.  Presence of catalyst
4.  It shows how the rate of reaction depends on the concentration of reactants.
          a.  Rate law
          b.  Rate constant
          c.  Rate of reaction
          d.  Instantaneous rate
5.  If the rate law of a reaction is Rate = k[A]²[B], what is the overall reaction order?
          a.  first order overall
          b.  second-order overall
          c.  third order overall
          d.  fourth-order overall
6.  In the rate law in no. 5, what is the reaction order with respect to A?
          a.   first order 
          b.  second-order 
          c.  third order 
          d.  fourth-order 
7.  If the unit of rate constant in the second-order overall reaction is  M^-1s^-1, what is the unit of rate constant of the first order overall?
          a.  M²s^-1
          b.  s^-1
          c.  M^-3s^-1
          d.  s^-2
8.  In the equation A  +   B  →  C, what is the expression of the rate of disappearance of the products?
          a.  Rate = ∆[A] /∆t
          b. Rate =  ∆[B] /∆t
          c.  Rate = ∆[C] /∆t
          d.  Rate = -∆[A] /∆t
9.  Which of the following is an example of a first-order reaction?
          a.  A →  Products
          b.  2A →  Products
          c.  A  +  A  →  Products
          d.  AB  →  Products
 10.  The rate law for a reaction is Rate = k [A][B]²,  Which of the following statement is false?
          a.  The reaction is first order in A.
          b.  The reaction is second order in B
          c.  The reaction is second-order overall.
          d.  k is the reaction rate constant
11.  The data in the table below were obtained from the reaction:  A  +    B  →   P
         

 

         The rate law for this reaction is 

           a.  Rate = k[A][B]

           b.  Rate = k[A]²[B]

           c.  Rate = k[A]²[B]²

           d.  Rate = k[A]²

12.  A reaction was found to be zero order in A,  Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________.

           a.  remain constant

           b.  increase by a factor of 27.

           c.  increase by a factor of 9.

           d.  triple. 

13.  The minimum energy required to initiate a chemical reaction is called________.

           a. catalyst.

           b. activation energy.

           c.  orientation factor.

           d.  molecularity.

14.  The rate law of the overall reaction, A  +  B  →  C is rate = k[A]². Which of the following will not increase the rate of reaction?

          a.  increasing the concentration of reactant A

          b.  increasing the concentration of reactant B
          c.  increasing the temperature of the reaction
          d.  adding a catalyst for the reaction
15. The reaction of nitric oxide and hydrogen gas at 1280^oC is

2NO(g)  +  2H₂(g)  →  N₂(g)  +  H₂O(g)

      If the rate law of the reaction is rate = k[NO]²[H₂] and the k value is  2.5 x 10² M^-2.s^-1, what is the reaction rate of the reaction when [NO] = 1.0 x 10^-3 and [H₂] = 2.0 x 10^-3?
          a.  2.0 x 10^-7 M/s
          b.  2.0 x 107 M/s
          c.  5.0 x 10^-7 M/s
          d.  5.0 x 10⁷ M/s

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