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 souring of milk.

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes the state of water from solid to liquid without changing its chemical composition.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change because it transforms the wood into ash, smoke, and gases, creating new substances.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but the molecules themselves remain 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 the creation of new substances.

Front

Give an example of a physical change.

Back

An example of a physical change is crumpling a piece of paper.

Front

Give an example of a chemical change.

Back

An example of a chemical change is the reaction of vinegar and baking soda, which produces carbon dioxide gas.

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

Is dissolving sugar in water a physical or chemical change?

Back

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