NCERT Class 9 Science Exploration: Chapter 5 — 5. Exploring Mixtures and their Separation
This chapter, "Exploring Mixtures and their Separation," from NCERT Class 9 Science Exploration, delves into the classification and separation of mixtures. It explains the difference between homogeneous and heterogeneous mixtures, using examples like sugar in water (homogeneous) and sand in water (heterogeneous). The chapter introduces the concept of solutions and their uniform composition. It also highlights the practical importance of separating mixtures in everyday life, from industrial processes like sugar production to medical diagnostics. Through activities, students are encouraged to observe and differentiate between various types of mixtures, understanding their properties and behavior. This foundational knowledge is crucial for comprehending chemical concepts and their applications in the CBSE curriculum.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 9 |
| Subject | Science |
| Book | Exploration |
| Chapter | Chapter 5 — 5. Exploring Mixtures and their Separation |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 3 minutes |
| Word count | 542 |
Learning outcomes
- Differentiate between homogeneous and heterogeneous mixtures.
- Understand the properties of solutions.
- Recognize the importance of separating mixtures in daily life.
- Identify examples of homogeneous and heterogeneous mixtures.
Vocabulary
| Word | Meaning |
|---|---|
| Homogeneous mixture | A mixture with uniform composition throughout. |
| Heterogeneous mixture | A mixture that is not uniform in composition. |
| Solution | A homogeneous mixture that always remains homogeneous. |
| Suspended particles | Particles that are dispersed in a medium but will settle over time. |
| Evaporation | The process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and/or pressure. |
| Boiling | The rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point. |
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Practice questions
- What is the difference between a homogeneous and a heterogeneous mixture? Answer: A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture does not.
- Give two examples of homogeneous mixtures. Answer: Sugar and water, vinegar, aerated drinks.
- Give two examples of heterogeneous mixtures. Answer: Sand and water, oil and water.
- Why is milk considered a homogeneous mixture in the context of this chapter's initial examples? Answer: When milk is stirred with water, it appears uniform, and the particles are not easily visible, behaving like a homogeneous mixture initially.
Frequently asked questions
What is a homogeneous mixture?
A homogeneous mixture is one where the composition is uniform throughout, like sugar dissolved in water.
What is a heterogeneous mixture?
A heterogeneous mixture is one where the composition is not uniform, such as sand mixed with water.
Can you give an example of a solution?
Yes, vinegar (acetic acid in water) and aerated drinks are examples of solutions.
Why do suspended particles settle in muddy water but not in milk?
In muddy water, particles are larger and settle. In milk, particles are smaller and dispersed, behaving differently initially.
What is the significance of separating mixtures?
Separating mixtures is crucial for industrial processes like sugar production and medical tests.
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Topics covered
NCERT Class 9 Science — Exploration — Chapter 5 — 5. Exploring Mixtures and their Separation. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.