You will learn
- State the particle model.
- Explain evidence for particles.
- Draw particle diagrams.
- Evaluate the model.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- Matter is made of tiny particles.
- Particles are always moving.
- There are spaces between particles.
- Models have limits.
Words to know
a very small piece of matter
the smallest unit of an element
two or more atoms joined together
a simplified picture of how something works
1. Discover: The tea bag
Esi puts a tea bag in a cup of still water. The colour spreads out without stirring. “The water and tea particles are moving and mixing,” says Ms Frimpong. “We cannot see them, but the evidence shows they exist.”
Think: What other everyday evidence suggests tiny moving particles?
2. Understand: Particles
Idea 1: Idea
The particle model says all matter is made of tiny particles (atoms and molecules). They are always moving and have spaces between them.
Idea 2: Evidence
Evidence includes diffusion of smells and dyes, dissolving sugar and the way gases can be squashed. These are easier to explain with particles.
Idea 3: Limits
A model such as dots or balls is a simplification. Real particles are not hard balls and are far too small to see directly.
3. Worked examples
Example 1 (I show you): State
Model.
- Tiny.
- Moving.
- Spaces.
Answer: Three ideas.
Example 2 (We do it together): Give
Evidence.
- Smell spreads.
- Dye spreads.
- Sugar dissolves.
Answer: Three examples.
Example 3 (You try): Judge
Limits.
Show the steps and answer
- Balls.
- Too simple.
- Not seen.
Answer: Model limits.
Did you know?
A single drop of water contains roughly 1.7 sextillion (1.7 × 10²¹) molecules.
Why this matters
The particle model explains how the world of matter behaves.
4. Explore: Dye in water
Drop food colouring gently into still cold water and warm water in clear cups and compare how fast the colour spreads.
- Fill two cups.
- Add one drop to each.
- Observe.
- Compare.
Think about it: what did you notice?
What did you notice? The colour spread faster in warm water.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ is a very small piece of matter.
- An ___ is the smallest unit of an element.
- A ___ is atoms joined together.
- A ___ is a simplified picture.
Guided practice
Question 1. What is a particle?
Tiny piece.
Question 2. What is an atom?
Smallest unit.
Question 3. What is a molecule?
Joined atoms.
Independent practice
Level 1: Start
- What is a particle?
- What is an atom?
- What is a molecule?
- Are particles moving?
- What is a model?
Level 2: Grow
- Why particles?
- Why warm faster?
- Why limits?
Level 3: Stretch
- Compare cups.
- Draw particles.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain how dye spreading supports the particle model.
Show a sample answer
Use movement.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: Vibrate.
Fix: Simplified.
8. Lesson summary and revision card
- I can state the particle model.
- I can explain evidence for particles.
- I can draw particle diagrams.
- I can evaluate the model.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- Matter is made of tiny particles.
- Particles are always moving.
- There are spaces between particles.
- Models have limits.
11. Next lesson
Next lesson: Solids. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define atom and molecule. [2 marks]
- Give two pieces of evidence for particles. [3 marks]
- State the particle model. [3 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- Two [2]; link to particles [1]
- Tiny [1]; moving [1]; spaces [1]
- Any [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is a particle?
- What is an atom?
- What is a molecule?
- Are particles moving?
- What is a model?
- Why particles?
- Why warm faster?
- Why limits?
- Compare cups.
- Draw particles.
Homework
Explain how smell reaches you from a kitchen.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is a particle? | Tiny piece. | 1 |
| 2. What is an atom? | Smallest unit. | 1 |
| 3. What is a molecule? | Joined atoms. | 1 |
| 4. Are particles moving? | Yes. | 1 |
| 5. What is a model? | Simplified picture. | 1 |
| 6. Why particles? | Explain behaviour. | 1 |
| 7. Why warm faster? | Move faster. | 1 |
| 8. Why limits? | Simplified. | 1 |
| 9. Compare cups. | Table. | 1 |
| 10. Draw particles. | Diagram. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Tiny piece.; 2 Smallest unit.; 3 Joined atoms.; 4 Yes.; 5 Simplified picture.. Level 2: 1 Explain behaviour.; 2 Move faster.; 3 Simplified.. Level 3: 1 Table.; 2 Diagram.; 3 Sentence..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 State the particle model | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Explain evidence for particles | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Draw particle diagrams | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Evaluate the model | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “Particles are still in solids.” Vibrate.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: State the particle model.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child learns the particle model. You do not need to be an expert to help.
- Watch dye spread.
- Ask “What is happening?”
- Mind spills.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: state the particle model; explain evidence for particles; draw particle diagrams; evaluate the model.
Prerequisite knowledge. Grade 5 ideas: states of matter, changes of state, mixtures and dissolving.
Materials. Clear cups, water, food colouring. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Warm water.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Spray air freshener at the front and ask, “Why do those at the back smell it?”
Explanation (10 min). Teach the particle model.
Guided activity (10 min). Learners test.
Independent activity (10 min). Learners draw.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. How do you know? What is the model missing?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Particles are still in solids.” Vibrate.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. State the particle model. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 6 Unit 5, topic 2; Next Generation Science Standards, structure and properties of matter; Cambridge Lower Secondary Science, chemistry; IB Primary Years Programme, how the world works. These sources informed the lesson.