Physical and Chemical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, or the production of gas.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition, such as changes in state, shape, or size.

Front

Give an example of a chemical change.

Back

Burning wood, rusting iron, or digesting food.

Front

Give an example of a physical change.

Back

Melting ice, boiling water, or breaking a glass.

Front

What are indicators of a chemical change?

Back

Fizzing, foaming, color change, heat production, or light emission.

Front

Is rusting an example of a chemical change?

Back

Yes, rusting is a chemical change as it involves the reaction of iron with oxygen to form iron oxide.

Front

What happens during digestion?

Back

Food undergoes chemical changes as it is broken down into simpler substances by enzymes.

Front

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

Back

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

Front

Is crumpling paper a physical change?

Back

Yes, crumpling paper is a physical change because the paper's chemical structure remains the same.

Front

What is an example of a process that is NOT a physical change?

Back

Rusting of iron is not a physical change; it is a chemical change.