Particle Theory in Year 7 Science

These flashcards cover the key vocabulary and concepts related to the Particle Theory and changing states of matter as discussed in the Year 7 Science lecture.

Melting

The process where a solid turns into a liquid when heat energy is added.

Evaporation

The process where a liquid turns into a gas when heat energy is added.

Condensation

The process where a gas turns into a liquid when heat energy is removed.

Freezing

The process where a liquid turns into a solid when heat energy is removed.

Sublimation

The process where a solid turns directly into a gas when heat energy is added.

Deposition

The process where a gas turns directly into a solid when heat energy is removed.

Particle Model

A model explaining that all matter is made of particles that are always in motion.

Heating

The process of adding heat energy to a substance.

Cooling

The process of removing heat energy from a substance.

States of Matter

The distinct forms that different phases of matter take on, commonly solid, liquid, and gas.

Energy and Particle Movement

Adding heat to particles makes them gain energy and move faster, while cooling makes them lose energy and slow down.

What are the characteristics of a solid?

Solids have a definite shape and volume, their particles are closely packed together in a fixed arrangement, and they resist changes in shape.

What are the characteristics of a liquid?

Liquids have a definite volume but take the shape of their container, their particles are close together but can move past one another, allowing liquids to flow.

What state of matter is this particle model representing?

Solid

What state of matter is this particle model representing?

Gas

What state of matter is this particle model representing?

Liquid