Physical and Chemical Changes Review

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 bending.

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 changes such as rusting, burning, and digestion.

Front

How does temperature affect chemical reactions?

Back

Higher temperatures usually cause chemical reactions to happen faster due to increased energy and movement of particles.

Front

What is an example of a physical change?

Back

Filling an ice cube tray with water that freezes into ice cubes is an example of a physical change.

Front

What is a sign of a chemical change?

Back

A sign of a chemical change is the production of a new odor, color change, gas formation, or the formation of a precipitate.

Front

Is painting a door a physical or chemical change?

Back

Painting a door is an example of a physical change because the paint can be removed without changing the door's chemical structure.

Front

What happens to the properties of a substance during a physical change?

Back

The properties of a substance may change (like shape or state), but its chemical identity remains the same.

Front

What happens to the properties of a substance during a chemical change?

Back

The properties of a substance change, and a new substance is formed with different chemical properties.

Front

Can physical changes be reversed?

Back

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

Front

Can chemical changes be reversed?

Back

Chemical changes are often not easily reversible, as they involve the formation of new substances.