Chemical vs. Physical 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 cannot be reversed easily. Examples include burning, rusting, and baking.

Front

What happens to ice when it melts?

Back

When ice melts, it undergoes a physical change from solid to liquid water. This change can be reversed by freezing the water again.

Front

Why is baking a cake considered a chemical change?

Back

Baking a cake is a chemical change because it involves a chemical reaction that produces new substances, and the process cannot be reversed.

Front

What is an example of a physical change?

Back

An example of a physical change is freezing water into ice.

Front

What is an example of a chemical change?

Back

An example of a chemical change is burning paper.

Front

Can a chemical change be reversed?

Back

Most chemical changes cannot be reversed, meaning the original substances cannot be recovered.

Front

What is an indicator of a chemical change?

Back

Indicators of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

Front

What happens when toast is burned?

Back

When toast is burned, it undergoes a chemical change, resulting in the formation of new substances and a change in color and texture.

Front

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

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.