Physical Changes versus 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 changes in size, shape, or state of matter.

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 chemical composition of the original substance.

Front

Give an example of a physical change.

Back

Getting a haircut is an example of a physical change because it alters the appearance but not the chemical structure of the hair.

Front

Give an example of a chemical change.

Back

Making popcorn is an example of a chemical change because it involves a chemical reaction that transforms the corn kernels into a different substance.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules may change their arrangement or state (like solid to liquid) but their chemical structure remains the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the molecules break apart and rearrange to form new substances with different chemical properties.

Front

Is smashing cookies a physical or chemical change?

Back

Smashing cookies is a physical change because it changes the shape and size of the cookies without altering their chemical composition.

Front

Is frying eggs a physical or chemical change?

Back

Frying eggs is a chemical change because it involves cooking the eggs, which changes their chemical structure.

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

What are some indicators of a physical change?

Back

Indicators of a physical change include changes in state (solid, liquid, gas), shape, or size without any new substance being formed.