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 process where one or more substances are transformed into new substances with different properties. Examples include rusting, burning, and fermentation.

Front

What are some signs that a chemical reaction has occurred?

Back

Signs of a chemical reaction include the formation of a gas, change in color, formation of a precipitate, and change in temperature.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Melting butter for popcorn is a physical change.

Front

True or False: Change in color is always a sign of a physical change.

Back

False. Change in color can indicate a chemical change.

Front

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

Back

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

Front

What happens during a chemical change?

Back

During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water.

Front

What is an example of a chemical change?

Back

An example of a chemical change is iron rusting.

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.