1) Collision theory states that for a chemical reaction to happen the reactant particles must:  a) Collide with each other and have sufficient energy to react b) Collide with each other c) Have sufficient energy to react d) Be heated 2) What is the activation energy? a) energy released to the surroundings b) Minimum amount of energy needed by particles to react c) energy taken away from the surroundings d) Temperature required to start a chemical reaction 3) Which of the following factors both increases the frequency of collisions and makes the collisions more energetic? a) surface area increases b) pressure increases c) temperature increases d) concentration increases 4) How do catalysts increase the rate of a reaction? a) They increase the activation energy b) They lower the activation energy c) the collisions are more energetic d) the frequency of collisions increase 5) Give two reasons why the student’s prediction is correct. Tick two boxes: a) The particles are more concentrated. b) The particles have a greater mass. c) The particles move faster. d) The particles have more energy. 6) Which two variables should the student keep constant? Tick two boxes: a) Amount of water in the trough b) Concentration of acid c) Mass of marble chips d) Size of marble chips e) Volume of measuring cylinder 7) Select two points which explain, in terms of particles and collisions, the effect that increasing the surface area of the marble chips has on the rate of reaction. a) increasing the surface area increases rate b) more successful collisions c) more collisions d) more frequent collisions (between particles) 8) Calcium carbonate is a catalyst for the industrial production of biodiesel. Select one reason why using a catalyst reduces costs. a) decreases rate of reaction b) increases rate of reaction c) raises temperature can be used d) the catalyst is used up

Collision Theory

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