You will learn
- Define mixture and pure substance.
- Classify mixtures.
- Explain solutions and suspensions.
- Identify alloys.
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
- Mixtures can be separated by physical means.
- A solution looks clear and the solute does not settle.
- A suspension settles on standing.
- Alloys are metal mixtures.
Words to know
two or more substances mixed but not chemically joined
only one kind of substance
a mixture where a solute dissolves in a solvent
a mixture of metals
1. Discover: The kitchen sort
Sandra lays out salt water, muddy water, orange juice, a steel spoon and distilled water. “Which are mixtures?” her teacher asks. Sandra sorts them: salt water (solution), muddy water (suspension), steel (alloy), distilled water (pure).
Think: How could she check muddy water is a suspension?
2. Understand: Mixtures
Idea 1: Pure or mixed
A pure substance contains one kind of substance, such as distilled water. A mixture contains two or more substances that are not chemically joined and keep their own properties.
Idea 2: Types
A solution (salt in water) stays clear. A suspension (mud in water) settles. An alloy such as brass or steel is a mixture of metals.
Idea 3: Everyday
Air is a mixture of gases. Seawater is a solution. Soil is a mixture of mineral grains, air, water and organic matter.
3. Worked examples
Example 1 (I show you): Sort
Pure or mixed.
- One kind?
- More?
- Decide.
Answer: Classify each.
Example 2 (We do it together): Test
Suspension.
- Stand.
- Settles.
- Cloudy.
Answer: Settles over time.
Example 3 (You try): Name
Alloys.
Show the steps and answer
- Steel.
- Brass.
- Bronze.
Answer: Metal mixtures.
Did you know?
Air is about 78 percent nitrogen and 21 percent oxygen, with small amounts of other gases.
Why this matters
Most materials we use are mixtures, so separating them is important.
4. Explore: Mixture station
Make a salt solution, a sand suspension and a sieve mix of rice and beans; observe each after 10 minutes and classify.
- Make three mixtures.
- Stir.
- Wait.
- Classify.
Think about it: what did you notice?
What did you notice? The sand settled; the salt did not.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ is two or more substances not chemically joined.
- A ___ substance has one kind of substance.
- A ___ is a solute dissolved in a solvent.
- An ___ is a mixture of metals.
Guided practice
Question 1. What is a mixture?
Several substances.
Question 2. What is a pure substance?
One kind.
Question 3. What is a solution?
Dissolved.
Independent practice
Level 1: Start
- What is a mixture?
- What is a pure substance?
- What is a solution?
- What is an alloy?
- Is air a mixture?
Level 2: Grow
- Why separate?
- Why alloys?
- Why settle?
Level 3: Stretch
- Make mixtures.
- Classify.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain the difference between a solution and a suspension.
Show a sample answer
Use examples.
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: Can be solutions.
Fix: No.
8. Lesson summary and revision card
- I can define mixture and pure substance.
- I can classify mixtures.
- I can explain solutions and suspensions.
- I can identify alloys.
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
- Mixtures can be separated by physical means.
- A solution looks clear and the solute does not settle.
- A suspension settles on standing.
- Alloys are metal mixtures.
11. Next lesson
Next lesson: Separation methods. 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 mixture and alloy. [2 marks]
- Classify salt water, mud water and brass. [3 marks]
- Explain why a suspension settles. [3 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- Solution [1]; suspension [1]; alloy [1]
- Not dissolved [1]; heavy particles [1]; gravity [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 mixture?
- What is a pure substance?
- What is a solution?
- What is an alloy?
- Is air a mixture?
- Why separate?
- Why alloys?
- Why settle?
- Make mixtures.
- Classify.
Homework
List five mixtures in your kitchen.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is a mixture? | Several substances. | 1 |
| 2. What is a pure substance? | One kind. | 1 |
| 3. What is a solution? | Dissolved. | 1 |
| 4. What is an alloy? | Metal mixture. | 1 |
| 5. Is air a mixture? | Yes. | 1 |
| 6. Why separate? | Useful parts. | 1 |
| 7. Why alloys? | Stronger. | 1 |
| 8. Why settle? | Not dissolved. | 1 |
| 9. Make mixtures. | Table. | 1 |
| 10. Classify. | Chart. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Several substances.; 2 One kind.; 3 Dissolved.; 4 Metal mixture.; 5 Yes.. Level 2: 1 Useful parts.; 2 Stronger.; 3 Not dissolved.. Level 3: 1 Table.; 2 Chart.; 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 Define mixture and pure substance | 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 Classify mixtures | 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 Explain solutions and suspensions | 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 Identify alloys | 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: “All clear liquids are pure.” Can be solutions.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Classify mixtures.
- 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 studies mixtures. You do not need to be an expert to help.
- Sort the kitchen.
- Ask “Mixture or pure?”
- 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: define mixture and pure substance; classify mixtures; explain solutions and suspensions; identify alloys.
Prerequisite knowledge. Grade 5 ideas: states of matter, changes of state, mixtures and dissolving.
Materials. Cups, salt, sand, rice, beans, sieve. 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. Set out cups.
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). Show salt water and muddy water and ask, “How are these different?”
Explanation (10 min). Teach mixtures.
Guided activity (10 min). Learners make.
Independent activity (10 min). Learners classify.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. One kind or more? Does it settle?
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. “All clear liquids are pure.” Can be solutions.
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. Classify mixtures. 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 8; 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.