Chemhw6.2

10 Questions | Total Attempts: 296

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Chemhw6.2

These questions deal with collision theory, activation energy, and catalysts. REMEMBER: PERIOD# followed by FIRST & LAST NAME


Questions and Answers
  • 1. 
    A catalyst is added to a system at equilibrium.  If the temperature remains constant, the activation energy of the forward reaction
    • A. 

      Decreases

    • B. 

      Increases

    • C. 

      Remains the same

  • 2. 
    Base your answer to this question on the information below. A student wishes to investigate how the reaction rate changes with a change in concentration of HCl(aq). Given the reaction: Zn(s) + HCl(aq) → H2(g) + ZnCl2(aq) Identify one other variable that might affect the rate and should be held constant during this investigation. [1]
  • 3. 
    Base your answer to this question on the information below. A student wishes to investigate how the reaction rate changes with a change in concentration of HCl(aq). Given the reaction: Zn(s) + HCl(aq) → H2(g) + ZnCl2(aq) Describe the effect of increasing the concentration of HCl(aq) on the reaction rate and justify your response in terms of collision theory. [1]         (HINT:  2 word answer)
    1.  
  • 4. 
    Given the reaction: S(s) + O2(g) → SO2(g) + energy Which diagram best represents the potential energy changes for this reaction?
    • A. 
    • B. 
    • C. 
    • D. 
  • 5. 
    In most aqueous reactions as temperature increases, the effectiveness of collisions between reacting particles
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Remains the same

  • 6. 
    Given the reaction at 25°C: Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g) The rate of this reaction can be increased by using 5.0 grams of powdered zinc instead of a 5.0-gram strip of zinc because the powdered zinc has
    • A. 

      Lower kinetic energy

    • B. 

      Lower concentration

    • C. 

      More surface area

    • D. 

      More zinc atoms

  • 7. 
    Given the reaction: N2(g) + O2(g) + 182.6 kJ → 2 NO(g) Which change would cause an immediate increase in the rate of the forward reaction?
    • A. 

      Increasing the concentration of NO(g)

    • B. 

      Increasing the concentration of N2(g)

    • C. 

      Decreasing the reaction temperature

    • D. 

      Decreasing the reaction pressure

  • 8. 
    At STP, which 4.0-gram zinc sample will react fastest with dilute hydrochloric acid?
    • A. 

      Bar

    • B. 

      Lump

    • C. 

      Powdered

    • D. 

      Sheet metal

  • 9. 
    Which information about a chemical reaction is provided by a potential energy diagram?
    • A. 

      The oxidation states of the reactants and products

    • B. 

      The average kinetic energy of the reactants and products

    • C. 

      The change in solubility of the reacting substances

    • D. 

      The energy released or absorbed during the reaction

  • 10. 
    A catalyst works by
    • A. 

      Increasing the potential energy of the reactants

    • B. 

      Increasing the energy released during a reaction

    • C. 

      Decreasing the potential energy of the products

    • D. 

      Decreasing the activation energy required for a reaction