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 bending, cutting, or melting.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include burning, rusting, and cooking.

Front

What happens to the particles in a solid?

Back

In a solid, particles are tightly packed together and vibrate in place, maintaining a fixed shape and volume.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture when two liquids are mixed together.

Front

What is density?

Back

Density is a physical property defined as mass per unit volume of a substance, often expressed in grams per cubic centimeter (g/cm³).

Front

Give an example of a physical change.

Back

Bending a metal rod is an example of a physical change.

Front

Give an example of a chemical change.

Back

Lighting a match is an example of a chemical change.

Front

What state of matter has particles that are loosely packed?

Back

Liquid.

Front

What is the best example of a new substance forming?

Back

Lighting a match, as it produces ash and gases.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not alter the chemical composition of a substance, while chemical changes do.