Physical vs. Chemical Changes

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 boiling.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves making or breaking of bonds between atoms. Examples include rusting, burning, and digestion.

Front

What happens when sodium reacts with chlorine?

Back

A new compound is formed — salt.

Front

Which change can be easily reversed?

Back

Physical Change.

Front

What is an example of a physical change?

Back

Water boiling.

Front

What is conductivity?

Back

Conductivity is the property of matter that allows a substance to transfer heat or electricity.

Front

What happens to the molecules during a physical change?

Back

The molecules may change their arrangement or state, but their chemical structure remains the same.

Front

What happens to the molecules during a chemical change?

Back

The molecules rearrange to form new substances with different properties.

Front

Is ripping paper a physical or chemical change?

Back

Ripping paper is a physical change.

Front

What is an example of a chemical change?

Back

Metal rusting.