Physical and Chemical 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 one or more new substances with different properties. Examples include rusting, burning, and digestion.

Front

Which of the following is NOT an example of a physical change?

Back

Rust is NOT an example of a physical change; it is a chemical change.

Front

What are some signs of a chemical change?

Back

Signs of a chemical change include color change, gas production (bubbles, fizzing), temperature change, and the formation of a precipitate.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but their chemical structure remains the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in new substances.

Front

Give an example of a physical change.

Back

An example of a physical change is ice melting into water.

Front

Give an example of a chemical change.

Back

An example of a chemical change is wood burning to form ash and smoke.

Front

What is rusting an example of?

Back

Rusting is an example of a chemical change.

Front

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

Back

A physical change does not create new substances, while a chemical change does.