Physical and Chemical Changes Review

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 ice or breaking a glass.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting iron or burning wood.

Front

What happens during evaporation?

Back

Evaporation is the process where liquid water turns into water vapor, leaving behind any dissolved substances, like salt.

Front

Can a physical change be reversed?

Back

Yes, many physical changes can be reversed, such as freezing and melting water.

Front

Can a chemical change be reversed?

Back

Most chemical changes cannot be easily reversed, as they create new substances.

Front

What is rust?

Back

Rust is a chemical compound formed when iron reacts with oxygen and moisture, resulting in a reddish-brown substance.

Front

What is an example of a reversible change?

Back

Melting chocolate is an example of a reversible change; it can solidify again when cooled.

Front

What is an example of an irreversible change?

Back

Burning wood is an example of an irreversible change; it creates ash and gases that cannot be turned back into wood.

Front

What is the effect of sunlight on materials?

Back

Sunlight can cause materials, like fabric, to fade or change color over time due to chemical changes.

Front

What is the difference between a physical and chemical change?

Back

A physical change alters the form or appearance of a substance without changing its identity, while a chemical change transforms the substance into a different one.