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 new chemical substances. It involves a chemical reaction and includes processes like rusting, burning, and cooking.

Front

Is melting wax a physical or chemical change?

Back

Melting wax is a physical change.

Front

What is rust?

Back

Rust is a reddish-brown oxide formed when iron reacts with oxygen in the presence of moisture, indicating a chemical change.

Front

Is rusting an example of a physical change?

Back

No, rusting is an example of a chemical change.

Front

What happens during a chemical reaction?

Back

During a chemical reaction, substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What is an example of a physical change involving water?

Back

Dissolving sugar in water is an example of a physical change.

Front

What is a sign that a chemical reaction has occurred?

Back

Formation of a gas is a sign that a chemical reaction has occurred.

Front

What is an example of a physical change?

Back

Crumpling paper is an example of a physical change.

Front

Which of the following is NOT a physical change: crumpled paper, pencil sharpening, shrunken clothing, or rust?

Back

Rust is NOT a physical change.