Chemical vs Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties. Examples include burning, cooking, and rusting.

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. Examples include melting, freezing, and dissolving.

Front

Give an example of a chemical change.

Back

Fireworks exploding is an example of a chemical change because it produces new substances and energy.

Front

Give an example of a physical change.

Back

Melting chocolate is an example of a physical change because it changes from solid to liquid but remains chocolate.

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 the molecules themselves remain the same.

Front

Is cooking an egg a chemical or physical change?

Back

Cooking an egg is a chemical change because it transforms the proteins in the egg into a different structure.

Front

Is melting wax a chemical or physical change?

Back

Melting wax is a physical change because the wax changes from solid to liquid without altering its chemical composition.

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

What is an indicator of a physical change?

Back

Indicators of a physical change include changes in state (solid, liquid, gas) and changes in shape or size.