Reversible and Irreversible change

Front

What is a reversible change?

Back

A reversible change is a change that can be undone or reversed, allowing the substance to return to its original state.

Front

What is an irreversible change?

Back

An irreversible change is a change that cannot be undone, resulting in the substance being permanently altered.

Front

Give an example of a reversible change.

Back

Melting ice is an example of a reversible change, as it can be frozen back into ice.

Front

Give an example of an irreversible change.

Back

Baking a cake is an example of an irreversible change, as the ingredients cannot be returned to their original state.

Front

Is burning wood a reversible change?

Back

No, burning wood is an irreversible change because it transforms the wood into ash and smoke.

Front

What happens during melting?

Back

During melting, a solid changes into a liquid when heat is applied.

Front

What is the process called when a liquid turns into a solid?

Back

The process is called freezing.

Front

What is an example of a physical change?

Back

Dissolving sugar in water is an example of a physical change, as it can be reversed by evaporating the water.

Front

What is an example of a chemical change?

Back

Rusting of iron is an example of a chemical change, as it results in a new substance that cannot be reversed.

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.