Physical changes

Front

What is a physical change?

Back

A physical change is a change that alters the form of an object without changing its chemical makeup.

Front

How many states of matter are there?

Back

There are four states of matter: solid, liquid, gas, and plasma.

Front

What happens to water at 100°C?

Back

Water starts to boil at 100°C.

Front

Which state of water is the least dense?

Back

Gas is the least dense state of water.

Front

What is the melting point of ice?

Back

The melting point of ice is 0°C.

Front

What is an example of a physical change?

Back

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

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

What happens to the particles in a solid when it melts?

Back

The particles in a solid gain energy and move apart when it melts.

Front

What is density?

Back

Density is the mass of an object divided by its volume.

Front

Which material requires more heat to melt: copper, nitrogen, water, table salt, or iron?

Back

Iron requires more heat to melt.