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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, altering the chemical composition of the original substance.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Physical change.

Front

Which of the following is NOT an example of a physical change: crumpled paper, pencil sharpening, shrunken clothing, or rust?

Back

Rust.

Front

True or False: In a physical change, the makeup of matter is changed.

Back

False.

Front

When mixing two liquids, if one floats on top of the other, is this a physical or chemical change?

Back

Physical change.

Front

What are some signs of a chemical change?

Back

Signs of a chemical change include color change, production of heat, and light produced.

Front

What happens to the molecules during a physical change?

Back

The molecules may change their arrangement or state (solid, liquid, gas) but their chemical structure remains the same.

Front

What happens to the molecules during a chemical change?

Back

The molecules rearrange to form new substances with different chemical properties.

Front

Give an example of a physical change.

Back

Examples include melting ice, boiling water, or dissolving sugar in water.