IGCSE Chemistry 0620/21/O/N/21 Q13


13 Which statements about the effect of increasing the temperature on the rate of a reaction are correct?

1 It increases the rate of a reaction.
2 It increases the activation energy.
3 It increases the frequency of collisions.

A 1, 2 and 3    B 1 and 2 only    C 1 and 3 only    D 2 and 3 only

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Answer ( 1 )


    Increasing the temperature will increase the kinetic energy possessed by the fast moving particles. Increased kinetic energy makes the reacting particles move faster, hence the reacting particles collide with each other more frequently. (3 is true)

    If frequency of collision between particles increases, the frequency of effective collision between particles also increases, hence rate of reaction increases. (1 is true)

    Th activation energy of a reaction is constant. Increasing the temperature will only allow the reacting particles to overcome the activation energy more easily, it doesn’t change the activation energy itself. (2 is false)

    Ans: C 1 and 3 only

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