Collision Theory Worksheet - Answer Key

 

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  1. What are three requirements for a reaction to proceed?

       

    • Particles must collide with each other.

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    • Particles must be correctly orientated.

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    • Paritcles must have enough energy to meet activation energy (Ea).

    2.  

     

  2. What is Ea?

    The energy required for reactants    àproducts.

    3.  

     

  3. Label




    4.  

     

  4.  Write the Arrhenius Equation

    k = Ae(-Ea/RT)

    5.  

     

  5. The activation energy for the decomposition of HI(g) to H2g) and I2(g) is 186 kJ/mol. The rate constant at 555K is 3.52 x 10-7­L/mol s. What is the rate constant t 645K?

    k = 9.75 x 10-5 M-1s-1

    6.  

     

  6. The reaction

    (CH3)3CBr + OH-    → (CH3)3COH + Br-

    in a certain solvent is first order with respect to (CH3)3CBr and zero order with respect to OH-.  A plot of ln(k) versus 1/T was constructed that resulted in a straight line with the slope of -1.10 x 104 K and a y intercept of 33.5.

       

    • Determine the Ea.

      Ea = 91454 J

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    • Determine A.

      A = 3.54 x 1014

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    • Calculate k at 298K.

      k = 0.0330 s-1

    7.  

     

  7. Consider

    NO2(g) + CO(g)    → NO(g) + CO2(g)

    If the activation energy is 125 kJ/mol, and ΔE for the reaction is -216 kJ/mol. What is the activation energy for the reverse reaction?

    Ea= 341 kJ/mol

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