Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into different substances with new chemical properties.

Front

What is a physical change?

Back

A physical change is a process that alters the form or appearance of a substance but does not change its chemical composition.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change, as it produces ash and smoke, which are different substances.

Front

Give an example of a physical change.

Back

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

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

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

Is rusting of iron a chemical or physical change?

Back

Rusting of iron is a chemical change because it forms a new substance, iron oxide.

Front

Is dissolving sugar in water a chemical or physical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

What is an indicator of a chemical change?

Back

An indicator of a chemical change can include color change, temperature change, gas production, or the formation of a precipitate.

Front

What is an indicator of a physical change?

Back

An indicator of a physical change can include changes in state (solid, liquid, gas) or changes in shape or size.