Physical and Chemical Change Reading Check

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.

Front

Give an example of a physical change.

Back

An ice cube melting is an example of a physical change.

Front

What happens to a copper penny over time?

Back

A copper penny can undergo a chemical change and turn greenish due to the formation of copper carbonate.

Front

What is an indicator that a chemical change has occurred?

Back

Indicators of a chemical change include the formation of a new substance, color change, gas production, and temperature change.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide.

Front

How can burning paper be classified?

Back

Burning paper is a chemical change because it results in the formation of new substances, such as ash and gases.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is the mass of a saltwater mixture if 25 grams of salt is dissolved in 1,000 grams of water?

Back

The mass of the saltwater mixture would be 1,025 grams.

Front

What is an example of a new substance being formed?

Back

A nail rusting is an example of a new substance being formed.