Factors Affects Of Chemical Reaction

23 Questions | Total Attempts: 576

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Factors Affects Of Chemical Reaction

Questions and Answers
  • 1. 
    Activation energy is required to initiate
    • A. 

      Endothermic reactions only.

    • B. 

      Neither exothermic or endothermic reactions.

    • C. 

      Both exothermic and endothermic reactions.

    • D. 

      Exothermic reactions only.

  • 2. 
    Which condition will increase the rate of a chemical reaction?
    • A. 

      Increased temperature and decreased concentration of reactants

    • B. 

      Increased temperature and increased concentration of reactants

    • C. 

      Decreased temperature and decreased concentration of reactants

    • D. 

      Decreased temperature and increased concentration of reactants.

  • 3. 
    Given the reaction:     2 SO2(g) + O2(g) --> 2 SO3(g)  The rate of the forward reaction increases by adding more SO2 because the
    • A. 

      Number of molecular collisions will increase

    • B. 

      Temperature will increase

    • C. 

      Forward reaction is endothermic

    • D. 

      Reaction will shift to the left

  • 4. 
    A catalyst works by doing what?
    • A. 

      By increasing the kinetic energy of the molocules

    • B. 

      By reducing the activiation energy

    • C. 

      By increasing the activation energy

    • D. 

      By providing a large surface area

  • 5. 
    What factors can alter the rate of a reaction?
    • A. 

      Temperature

    • B. 

      Molocule size

    • C. 

      X ray absorption

    • D. 

      Absorptivity

  • 6. 
    What is the Delta H value for this reaction?
    • A. 

      572 kJ mol-1

    • B. 

      1370 kJ mol-1

    • C. 

      -572 kJ mol -1

    • D. 

      1942 kJ mol -1

  • 7. 
    Activation energy is required to initiate
    • A. 

      Endothermic reactions only.

    • B. 

      Neither exothermic or endothermic reactions.

    • C. 

      Both exothermic and endothermic reactions.

    • D. 

      Exothermic reactions only.

  • 8. 
    When NH4NO3 is dissolved in water, the temperature of the water decreases.  When NaOH is dissolved in a separate water sample, the temperature of the water increases.  Based on these observations, it can be concluded that the dissolving of
    • A. 

      Both salts are endothermic.

    • B. 

      Both salts are exothermic.

    • C. 

      NH4NO3 is exothermic and the dissolving of NaOH is endothermic.

    • D. 

      NH4NO3 is endothermic and the dissolving of NaOH is exothermic.

  • 9. 
    Given the reaction:     2 SO2(g) + O2(g) --> 2 SO3(g)  The rate of the forward reaction increases by adding more SO2 because the
    • A. 

      Number of molecular collisions will increase

    • B. 

      Temperature will increase

    • C. 

      Forward reaction is endothermic

    • D. 

      Reaction will shift to the left

  • 10. 
    A collision model can only happen when two molecules collide just right?
    • A. 

      True

    • B. 

      False

  • 11. 
    A reaction only takes when a molecule separates?
    • A. 

      True

    • B. 

      False

  • 12. 
    Does the collision model only apply to when molecules collide?
    • A. 

      Yes

    • B. 

      No

  • 13. 
    On this graph, which letter represents the activation energy? (hint: it isn't F)
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

    • E. 

      E

  • 14. 
    Which three factors affect the rate of a chemical reaction?
    • A. 

      Catalyst, Product Concentration, Container Volume

    • B. 

      Temperature, Reactant Concentration, Pressure

    • C. 

      Temperature, Reactant Concentration, Catalyst

    • D. 

      Temperature, Product Concentration, Container Volume

  • 15. 
    In the reaction 2A + B --> 2C + D, the -[A] per time was found to be 5.0  .  What is the rate of change of B?
    • A. 

      25 M/min

    • B. 

      10 M/min

    • C. 

      2.5 M/min

    • D. 

      5.0 M/min

  • 16. 
    Consider the reaction which ammonia is synthesized from nitrogen and hydrogen gases: How is the rate of formation of ammonia related to the rate of consumption of hydrogen?
    • A. 

      The rate of formation of ammonia is two thirds the rate of consumption of hydrogen

    • B. 

      The rate of formation of ammonia is half the rate of consumption of hydrogen

    • C. 

      The rate of formation of ammonia is equal to the rate of consumption of hydrogen

    • D. 

      The rate of formation of ammonia is 1/5 times the rate of consumption of hydrogen

  • 17. 
    Use the information below to determine the order of the reaction with respect to the concentration of A. A + B -->  P Trial     [A]            [B]        rate 1          0.273       0.763    2.83 2          0.273       1.526    2.83 3          0.819       0.763    25.47
    • A. 

      3

    • B. 

      4

    • C. 

      2

    • D. 

      1

  • 18. 
    The difference between the potential energy of the products and the potential energy of the reactants is the
    • A. 

      Heat of fusion

    • B. 

      Heat of reaction

    • C. 

      Free energy

    • D. 

      Activation energy

  • 19. 
    The decomposition of nitrogen dioxide to nitrogen and oxygen is second-order with a rate constant k = 12.5 M-1 s-1. What is the half-life for the reaction if [NO2]0 = 0.00260 M
    • A. 

      30.8 sec

    • B. 

      0.0800 sec

    • C. 

      0.0554 sec

    • D. 

      61.5

  • 20. 
    Which of the following graphs is linear for A --> products
    • A. 

      Ln[A] versus t if first-order in A

    • B. 

      Ln[A] versus t if second-order in A

    • C. 

       versus  if second-order A

    • D. 

      1/[A] versus t if first-order in A

  • 21. 
    For the reaction A --> B, the activation energy is  = 125 kJ/mol and the heat of reaction, H = 50. kJ/mol. What is the  for the reverse reaction in kJ/mol?
    • A. 

      125 kJ/mol

    • B. 

      -75 kJ/mol

    • C. 

      75 kJ/mol

    • D. 

      -125 kJ/mol

  • 22. 
    Which of the following will lower the activation energy for a reaction? 
    • A. 

      Adding a suitable catalyst

    • B. 

      Increasing the concentrations of reactants

    • C. 

      Raising the temperature of the reaction

    • D. 

      All of these options will lower the activation energy for a reaction

    • E. 

      There is no way to lower the activation energy of a reaction

  • 23. 
    Refer to the equation below, where two mechanisms are proposed for the reaction of nitrogen dioxide with carbon monoxide: NO2(g) + CO(g) --> CO2(g) + NO(g) Mechanism I: NO2(g) + CO(g) --> CO2(g) + NO(g) (one step) Mechanism II: NO2(g) + NO2(g) --> NO3(g) + NO(g) (slow) NO3(g) + CO(g) --> CO2(g) + NO2(g) (fast) What is the predicted rate law for Mechanism II?  
    • A. 

      Rate=k[NO2]

    • B. 

      Rate=k[NO2][CO]

    • C. 

      Rate=k[NO2]^2[CO]

    • D. 

      Rate=k[NO2]^2

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