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 the rearrangement of atoms. Examples include burning, rusting, and cooking.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

What happens during condensation?

Back

During condensation, water vapor cools and changes into liquid water, which is a physical change.

Front

What causes iron to rust?

Back

Iron rusts due to a chemical reaction with oxygen and moisture in the air, forming iron oxide.

Front

What is an example of a new substance forming?

Back

Lighting a match is an example of a new substance forming because it produces ash and gases.

Front

What happens when wood burns?

Back

When wood burns, it undergoes a chemical change, producing ash, smoke, and gases.

Front

Is cutting a piece of paper a physical or chemical change?

Back

Cutting a piece of paper is a physical change because the paper remains paper, just in smaller pieces.

Front

What is an example of a physical change?

Back

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

Front

What is an example of a chemical change?

Back

An example of a chemical change is baking a cake, where ingredients react to form a new substance.