States of Matter and Phase Changes

The video explains the three states of matter: solid, liquid, and gas. Solids have closely packed particles that vibrate but do not move freely, maintaining their shape. Liquids have particles that are less tightly packed, allowing them to change shape and take the form of their container. Gases have particles that move freely in all directions, allowing them to spread out and change shape. The video also covers how heating and cooling can change materials from one state to another, such as melting, evaporating, freezing, and condensing.

Which state of matter has particles that are closely packed and vibrate in place?

• Solid

• Liquid

• Gas

• Plasma

What happens to a solid when it is heated?

• It condenses into a liquid.

• It melts into a liquid.

• It evaporates into a gas.

• It freezes into a solid.

What is the process called when a liquid turns into a gas?

• Evaporating

• Melting

• Condensing

• Freezing

How does cooling affect a gas?

• It freezes into a solid.

• It condenses into a liquid.

• It evaporates into a gas.

• It melts into a liquid.

Which process describes a liquid becoming a solid?

• Melting

• Freezing

• Evaporating

• Condensing