Grade 3 Chemistry Quiz: Catalyst

What is a catalyst?

• A substance that slows down a chemical reaction without being consumed

• A substance that speeds up a chemical reaction without being consumed

• A substance that changes color during a chemical reaction

• A substance that has no effect on a chemical reaction

What does a catalyst do to the rate of a reaction?

• Decreases the rate of the reaction

• Has no effect on the rate of the reaction

• Causes the reaction to stop completely

• Increases the rate of the reaction

Does a catalyst increase or decrease the rate of a reaction?

• stay the same

• decrease

• have no effect

• increase

How does a catalyst affect the speed of a chemical reaction?

• A catalyst increases the speed of a chemical reaction by lowering the activation energy required for the reaction to occur.

• A catalyst slows down the speed of a chemical reaction by increasing the activation energy required for the reaction to occur.

• A catalyst has no effect on the speed of a chemical reaction.

• A catalyst only works for certain types of chemical reactions and not all.

Can you give an example of a catalyst?

• Iron

• Wood

• Plastic

• Water

Why are catalysts important in chemistry?

• They are only used in biology, not chemistry

• They speed up chemical reactions without being consumed

• They have no effect on chemical reactions

• They slow down chemical reactions without being consumed

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

• Changes the products of the reaction

• Has no effect on the reaction

• Slows down the reaction by increasing activation energy

• Speeds up the reaction by lowering activation energy

How does a catalyst help in a chemical reaction?

• It has no effect on the reaction.

• It slows down the reaction without being consumed.

• It speeds up the reaction without being consumed.

• It changes the color of the reactants.

What is the purpose of using a catalyst in a reaction?

• To slow down the reaction

• To make the reaction more expensive

• To speed up the reaction without being consumed

• To change the color of the reaction

Why do scientists use catalysts in experiments?

• To speed up chemical reactions without being consumed

• To change the color of the chemicals

• To make the experiment look more interesting

• To slow down chemical reactions without being consumed