4A Chemical and physical properties and changes

Front

What is a chemical property?

Back

A characteristic of a substance that can only be observed during a chemical reaction, indicating how a substance interacts with other substances.

Front

What is a physical property?

Back

A characteristic of a substance that can be observed or measured without changing the substance's chemical identity.

Front

What is a chemical change?

Back

A process that involves the transformation of one or more substances into different substances, resulting in a change in chemical composition.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

Give an example of a chemical property.

Back

Flammability, which indicates how easily a substance can ignite.

Front

Give an example of a physical property.

Back

Density, which is the mass per unit volume of a substance.

Front

What happens during rusting of iron?

Back

Iron reacts with oxygen and moisture in the environment, resulting in the formation of iron oxide, a chemical change.

Front

What is the significance of density in identifying substances?

Back

Density can help distinguish between different substances, as each substance has a unique density.

Front

How does dyeing hair represent a physical change?

Back

Dyeing hair changes its color but does not alter the chemical structure of the hair itself.

Front

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

Back

A physical change does not change the chemical identity of a substance, while a chemical change results in the formation of new substances.