States of matter

What is a solid?

A solid has a definite shape and volume. Its particles are closely packed together.

What is a liquid?

A liquid has a definite volume but takes the shape of its container. Its particles are less tightly packed than solids.

What is a gas?

A gas has no definite shape or volume. Its particles are far apart and move freely.

True or false: Plasma is a state of matter.

True, because plasma consists of charged particles and is found in stars.

Difference between solid and liquid.

Solids have a fixed shape; liquids take the shape of their container.

Fill in the blank: Water can exist as ____.

Water can exist as solid (ice), liquid (water), and gas (steam).

What causes gas to expand?

Gas expands when heated. The particles move faster and spread apart.

What happens to ice when heated?

Ice melts into water, changing from a solid to a liquid.

True or false: All substances can exist in all states.

False, because some substances do not exist as gases or plasmas.

What is plasma?

Plasma is a hot gas with charged particles. It is found in stars and neon lights.

Difference between gas and plasma.

Gas has neutral particles; plasma has charged particles.

Which state of matter has the most energy?

Plasma has the most energy due to its charged particles.