Chemical and Physical Reactions Quiz

What is the main difference between a chemical and a physical reaction?

• A chemical reaction involves a change in temperature.

• A physical reaction can only occur in liquids.

• A chemical reaction results in the formation of one or more new substances.

• A physical reaction involves the rearrangement of molecules.

Which of the following is a sign of a chemical reaction?

• Boiling water

• Dissolving sugar in water

• Rusting of iron

• Melting of ice

What is required to start a chemical reaction?

• Activation energy

• Water

• Light

• Heat

In a chemical reaction, what happens to the atoms involved?

• They are destroyed.

• They are created.

• They are rearranged.

• They remain unchanged.

What is a reactant in a chemical reaction?

• A substance produced by the reaction.

• A substance that speeds up the reaction without being consumed.

• A substance that is present at the start of the reaction.

• A substance that is added to stop the reaction.

What does the Law of Conservation of Mass state about chemical reactions?

• Mass can neither be created nor destroyed.

• Mass increases after a chemical reaction.

• Mass decreases after a chemical reaction.

• Mass can be created during a chemical reaction.

Which of the following is an example of a chemical change?

• Freezing water into ice

• Cutting a piece of paper

• Burning wood

• Mixing sand and water

What role do catalysts play in chemical reactions?

• They increase the temperature of the reaction.

• They decrease the reaction time by lowering the activation energy.

• They are used up in the reaction.

• They prevent the reaction from happening.

What is a product in a chemical reaction?

• A substance that is used to start the reaction.

• A substance that is unchanged by the reaction.

• A substance that is present at the end of the reaction.

• A substance that increases the rate of the reaction.

Which of the following is a characteristic of a chemical reaction?

• Change in state of matter

• Change in color

• Change in volume

• Change in shape