5.P.2.3 Chemical and Physical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the composition of the substance. Examples include burning, rusting, and cooking.

Front

What happens to water when heat is added?

Back

When heat is added to water, it can change from a solid (ice) to a liquid (water) or from a liquid to a gas (steam). This is a physical change.

Front

What happens to leaves when they burn?

Back

When leaves burn, they undergo a chemical change, resulting in the formation of ashes and gases.

Front

What is rust?

Back

Rust is a reddish-brown substance that forms when iron reacts with oxygen and moisture in the air. This process is a chemical change.

Front

What is an example of a chemical change in food?

Back

Frying an egg is an example of a chemical change because it transforms the egg's proteins and creates new substances.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change because it changes from solid to liquid without changing its chemical structure.

Front

What does it mean when an apple turns brown?

Back

When an apple turns brown, it is undergoing a chemical change due to oxidation, which alters its appearance and flavor.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not change the substance's chemical identity, while a chemical change results in the formation of new substances.

Front

What is an example of a physical change involving water?

Back

Boiling water is an example of a physical change where water changes from liquid to gas (steam) without changing its chemical composition.