Year 7 · Science · Particles and states of matter · Lesson 1
Solids, liquids and gases
The particle model of solids, liquids and gases - arrangement, movement and forces - and how it explains shape, flow and compression.
16-minute video lesson
Teaching, worked examples and 20 practice questions solved step by step.
Watch free for a monthWhat your child will learn
- Describe particles in each state
- Draw particle diagrams
- Explain properties using particles
The method
- State.
- Arrangement.
- Movement.
- Link with ‘so’.
Key words: particle model, solid, liquid, gas, compress, vibrate.
Worked examples
The first three practice questions from the lesson, with every step.
Question 1
Name the three states of matter.
- Step 1: S, L, G
Answer: solid, liquid, gas
Question 2
Which state has a fixed shape?
- Step 1: Hard
Answer: solid
Question 3
Which state can be compressed?
- Step 1: Gaps
Answer: gas