Unit 2: Matter

Front

What is matter?

Back

Matter is anything that has mass and takes up space.

Front

What is density?

Back

Density is the mass of an object divided by its volume, often expressed in g/cm³.

Front

What happens to water when it is heated?

Back

When water is heated, it gains energy, which can cause it to change state from liquid to gas (evaporation) when it reaches its boiling point.

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 occurs when a substance transforms into a different substance with different properties.

Front

What is the boiling point of water?

Back

The boiling point of water is 100°C (212°F) at standard atmospheric pressure.

Front

What is evaporation?

Back

Evaporation is the process by which liquid water turns into water vapor (gas) at temperatures below its boiling point.

Front

What is condensation?

Back

Condensation is the process by which water vapor cools and changes back into liquid water.

Front

What is the relationship between temperature and state of matter?

Back

Temperature affects the state of matter; increasing temperature can cause solids to melt into liquids and liquids to evaporate into gases.

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.