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 changes in state, shape, or size.

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 properties of the substance.

Front

Is breaking glass a physical or chemical change?

Back

Breaking glass is a physical change because it alters the shape and size of the glass without changing its chemical composition.

Front

Is freezing juice a physical or chemical change?

Back

Freezing juice is a physical change because it changes the state of the juice from liquid to solid without changing its chemical composition.

Front

What is an example of a physical change?

Back

Ripping paper is an example of a physical change because it changes the shape and size of the paper without changing its chemical properties.

Front

Is melting butter a physical or chemical change?

Back

Melting butter is a physical change because it changes the state of the butter from solid to liquid without altering its chemical composition.

Front

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

Back

Rust is NOT a physical change; it is a chemical change because it involves a reaction that forms a new substance.

Front

What happens during a physical change?

Back

During a physical change, the form of a substance changes, but its chemical identity remains the same.

Front

What happens during a chemical change?

Back

During a chemical change, substances react to form new substances with different chemical properties.

Front

Can physical changes be reversed?

Back

Many physical changes can be reversed, such as freezing and melting, but some may not be easily reversible.