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. Examples include rusting, burning, and digestion.

Front

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

Back

Rust is NOT an example of a physical change; it is a chemical change.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Melting butter for popcorn is a physical change.

Front

What happens during a chemical change?

Back

During a chemical change, one or more new substances are formed, and the original substances lose their chemical properties.

Front

True or False: Rust on an iron bar is an example of a chemical change.

Back

True.

Front

True or False: A change in color always indicates a physical change.

Back

False; a change in color can indicate a chemical change.

Front

What is an example of a physical change?

Back

Examples of physical changes include boiling water, melting ice, and breaking glass.

Front

What is an example of a chemical change?

Back

Examples of chemical changes include burning wood, baking a cake, and rusting iron.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.