GCSE Chemistry - States of Matter & Changing State #21

The video explains the states of matter—solid, liquid, and gas—using particle theory. It describes how particles behave in each state and how substances transition between states through heating and cooling. The video also discusses the limitations of the particle model, noting that it simplifies complex interactions between particles.

What holds the particles together in a solid state?

• Weak forces of attraction

• Magnetic forces

• Strong forces of attraction

• No forces of attraction

What happens to the particles in a solid when it is heated to its melting point?

• They become more compact and form a lattice

• They lose energy and stop moving

• They gain energy and vibrate more, breaking free from their bonds

• They dissolve into a gas

How do particles in a liquid behave compared to those in a solid?

• They are fixed in place and cannot move

• They are free to move around and are arranged randomly

• They form a rigid lattice structure

• They are tightly packed and vibrate in place

What is the behavior of gas particles in terms of motion?

• They move in a fixed pattern

• They are stationary and do not move

• They move in circular paths

• They move in straight lines and are deflected randomly

What happens to a gas when it is cooled sufficiently?

• It expands and fills the container

• It condenses into a liquid

• It becomes a solid immediately

• It evaporates into the air