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WAEC Chemistry 2018 Theory — Question 11

Question 11 of 24 from the West African Examinations Council (WAEC) Chemistry 2018 Theory paper, with the correct answer and a full explanation.

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2.(a)(i) State the collision theory of reaction rates. (ii) Using the collision theory, explain briefly how temperature affects the rate of a chemical reaction.

Model answer

(i) The collision theory states that there must be an effective collision between reacting particles for a reaction to occur. (ii) As temperature increases, particles gain more kinetic energy and collide more frequently and more effectively; this increase in collision rate/frequency increases the reaction rate.

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