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Lesson 20: Mixtures What is a mixture? Types of mixtures Solutions vs suspensions
Year 8 • Chemistry
Lesson 20: Mixtures
In this lesson, students learn what mixtures are, explore different types of mixtures, and understand the key differences between solutions and suspensions using simple everyday examples.
Lesson Objectives
- Define what a mixture is.
- Identify different types of mixtures.
- Understand solutions and suspensions.
- Compare solutions and suspensions.
1. What Is a Mixture?
A mixture is made when two or more substances are mixed together but are not chemically joined.
Each substance keeps its own properties.
[ Image Placeholder – Examples of Mixtures ]
Examples of mixtures:
• Air (mixture of gases)
• Salt and water
• Sand and water
• Air (mixture of gases)
• Salt and water
• Sand and water
2. Types of Mixtures
Mixtures can be grouped based on how well the substances mix.
[ Image Placeholder – Different Types of Mixtures ]
Types of mixtures:
• Solutions – completely mixed
• Suspensions – particles can be seen and may settle
• Solutions – completely mixed
• Suspensions – particles can be seen and may settle
3. Solutions
A solution is a mixture where a substance dissolves completely in a liquid.
The mixture looks clear.
[ Image Placeholder – Solution Example ]
Examples of solutions:
• Salt water
• Sugar in tea
• Lemonade
• Salt water
• Sugar in tea
• Lemonade
4. Suspensions
A suspension is a mixture where solid particles do not dissolve.
The particles may settle at the bottom over time.
[ Image Placeholder – Suspension Example ]
Examples of suspensions:
• Muddy water
• Sand in water
• Flour in water
• Muddy water
• Sand in water
• Flour in water
5. Solutions vs Suspensions
Solution:
• Clear appearance
• Particles do not settle
• Cannot be filtered easily
• Clear appearance
• Particles do not settle
• Cannot be filtered easily
Suspension:
• Cloudy appearance
• Particles settle over time
• Can be filtered
Practice Questions
A. Fill in the Blanks
- A mixture contains __________ or more substances.
- In a solution, the solute __________ completely.
- Suspensions look __________.
- Air is a mixture of __________.
- Sand and water form a __________.
B. True or False
- Mixtures are chemically combined.
- Salt water is a solution.
- Particles in suspensions settle.
- Solutions are cloudy.
- Mixtures can be separated.
C. Short Answer
- What is a mixture?
- Give one example of a solution.
- Give one example of a suspension.
- How can you tell a suspension from a solution?
- Can mixtures be separated? How?
✅ Show Answer Key
A. Fill in the Blanks
- two
- dissolves
- cloudy
- gases
- suspension
B. True or False
- False
- True
- True
- False
- True
C. Short Answer
- A mixture contains substances not chemically joined.
- Salt water / sugar solution.
- Muddy water / sand in water.
- Suspensions are cloudy and settle.
- Yes, by filtration, evaporation, etc.
© Aviate Learning – Mixtures (Year 8)
🧪 Solution or Suspension?
Choose a mixture and decide whether it forms a solution or a suspension.
Think about clarity and whether particles settle.
Choose a mixture and click “Test Mixture”.