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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, altering the chemical composition of the original substance.

Front

Give an example of a physical change.

Back

An example of a physical change is glass breaking.

Front

Give an example of a chemical change.

Back

An example of a chemical change is baking a cake.

Front

What happens to food when it spoils?

Back

When food spoils, it undergoes a chemical change.

Front

What type of change occurs when ice melts?

Back

Melting ice is a physical change.

Front

What type of change occurs when wood burns?

Back

Burning wood is a chemical change.

Front

What is the main difference between physical and chemical changes?

Back

The main difference is that physical changes do not change the substance's identity, while chemical changes do.

Front

What is an example of a reversible physical change?

Back

An example of a reversible physical change is freezing and melting water.

Front

What is an example of an irreversible chemical change?

Back

An example of an irreversible chemical change is rusting of iron.