Physical or Chemical Change

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

Front

What is a physical change?

Back

A physical change is a process that alters the form or appearance of a substance without changing its chemical composition.

Front

Give an example of a chemical change.

Back

Lighting a match is an example of a chemical change, as it produces new substances (ash, smoke) and releases energy.

Front

Give an example of a physical change.

Back

Melting ice cream is an example of a physical change, as it changes from solid to liquid but remains the same substance.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between atoms in molecules are broken and new bonds are formed, resulting in new substances.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but their chemical structure remains the same.

Front

What is an indicator of a chemical change?

Back

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

Front

What is an indicator of a physical change?

Back

Indicators of a physical change include changes in state (solid, liquid, gas), shape, or size without altering the substance's chemical identity.

Front

What is rusting an example of?

Back

Rusting is an example of a chemical change, as iron reacts with oxygen to form iron oxide (rust), a new substance.

Front

What is the process of sublimation?

Back

Sublimation is a physical change where a solid changes directly into a gas without becoming a liquid, such as dry ice turning into carbon dioxide gas.