SP5L1c (Physical & 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 burning, rusting, and cooking.

Front

At what temperature in degrees Celsius does water freeze?

Back

0 degrees Celsius.

Front

Which of the following is NOT an example of a chemical change? burning a log, rust forming on an object, gas burning on a stove, cutting lemons?

Back

Cutting lemons is NOT a chemical change.

Front

Is hammering wood together to build a house a chemical or physical change?

Back

It is a physical change.

Front

Is melting butter for popcorn a chemical or physical change?

Back

It is a physical change.

Front

What happens to the molecules in a substance 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 in a substance during a chemical change?

Back

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

Front

Give an example of a chemical change that occurs in everyday life.

Back

Examples include cooking food, burning wood, or rust forming on metal.

Front

What is an example of a physical change that can be reversed?

Back

Freezing water to make ice is a reversible physical change.