Chemical & Physical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances with different properties.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

List three signs of a chemical change.

Back

1. Formation of a precipitate 2. Unexpected color change 3. Production of gas (bubbles) or heat.

Front

What is an example of a physical change?

Back

Cutting, tearing, or breaking an object, such as cutting hair.

Front

What is the main difference between chemical and physical changes?

Back

Chemical changes result in new substances, while physical changes do not.

Front

Which type of change is usually irreversible?

Back

Chemical change.

Front

What happens to the molecules during a chemical change?

Back

Molecules rearrange to form new substances.

Front

What is an example of a chemical change?

Back

Burning wood, which produces ash and smoke.

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.