Physical and Chemical Changes Review

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, involving a rearrangement of atoms.

Front

Give an example of a physical change.

Back

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

Front

Give an example of a chemical change.

Back

An example of a chemical change is baking a cake, where ingredients undergo a chemical reaction to form a new product.

Front

What happens to energy during a chemical change?

Back

During a chemical change, energy can be absorbed or released, often in the form of heat or light.

Front

What is the difference between physical and chemical changes?

Back

Physical changes affect the form of a substance but not its chemical composition, while chemical changes result in the formation of new substances.

Front

What is an example of a change in the state of matter?

Back

An example of a change in the state of matter is boiling water, which changes from liquid to gas.

Front

What type of change is rusting of iron?

Back

Rusting of iron is a chemical change, as it involves a reaction with oxygen to form iron oxide.

Front

What is meant by the term 'conservation of mass' in chemical changes?

Back

The conservation of mass states that in a chemical reaction, the mass of the reactants equals the mass of the products.

Front

What is a characteristic of a physical change?

Back

A characteristic of a physical change is that it is usually reversible, such as freezing and melting.