Physical & 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 changes in size, shape, or state of matter.

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 chemical composition of the substance.

Front

Give an example of a physical change in the human body.

Back

Teeth breaking food down into smaller pieces is an example of a physical change during digestion.

Front

Give an example of a chemical change in the human body.

Back

Burning wood in a campfire is an example of a chemical change, as it produces new substances like ash and smoke.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes a change in temperature, production of gas, formation of a precipitate, or a change in color.

Front

What is rust and how is it formed?

Back

Rust is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide.

Front

What happens to the state of matter during a physical change?

Back

During a physical change, the state of matter can change (e.g., solid to liquid) but the chemical composition remains the same.

Front

What is an example of a change in state of matter?

Back

Melting ice into water is an example of a change in state of matter, which is a physical change.

Front

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

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in new substances being formed.

Front

What is an example of a physical change involving paper?

Back

Crumpling a piece of paper is an example of a physical change.