Reaction Rates Starter 2

What is the main role of a catalyst in a chemical reaction?

• To increase the temperature of the reaction

• To speed up the reaction without being used up

• To change the colour of the reactants

• To increase the amount of product formed

If you increase the temperature of a reaction mixture, what usually happens to the rate of reaction?

• The rate decreases

• The rate stays the same

• The rate increases

• The reaction stops

Which of the following will increase the rate of a reaction between a solid and a liquid?

• Using larger pieces of the solid

• Decreasing the temperature

• Crushing the solid into a powder

• Diluting the liquid

What effect does increasing the concentration of a reactant have on the rate of reaction?

• It decreases the rate

• It has no effect

• It increases the rate

• It stops the reaction

Which of the following is NOT a way to increase the rate of a chemical reaction?

• Lowering the temperature

• Adding a catalyst

• Increasing the concentration of reactants

• Increasing the surface area of a solid reactant

A catalyst works by:

• Raising the activation energy needed for the reaction

• Lowering the activation energy needed for the reaction

• Making the products heavier

• Changing the reactants into different chemicals

If you cut a potato into small cubes before adding it to hydrogen peroxide, what will happen to the rate of reaction compared to using a whole potato?

• The rate will decrease

• The rate will stay the same

• The rate will increase

• The reaction will not happen

Which of the following best explains why increasing the surface area of a solid reactant increases the rate of reaction?

• It makes the solid heavier

• It allows more particles to react at the same time

• It changes the temperature

• It adds more reactants

• The reaction would slow down

• The reaction would speed up

• The reaction would stop

• The products would change

Which of the following statements about catalysts is true?

• Catalysts are used up during the reaction

• Catalysts can be recovered and used again

• Catalysts decrease the amount of product formed

• Catalysts make the reaction colder