Physical and 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 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 changes the composition of the original substance. Examples include rusting, burning, and cooking.

Front

Is melting butter for popcorn a physical or chemical change?

Back

Melting butter for popcorn is a physical change.

Front

What are some indicators of a chemical change?

Back

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

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Dissolving sugar in water is a physical change.

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 happens to the molecules during a chemical change?

Back

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

Front

Is rusting of iron a physical or chemical change?

Back

Rusting of iron is a chemical change.

Front

What is an example of a physical change that occurs when water freezes?

Back

When water freezes, it changes from liquid to solid (ice), which is a physical change.