Class 8 Science Chapter 8 Nature of Matter: Elements, Compounds, and Mixtures (New Course)

Report a question

What’s wrong with this question?

You cannot submit an empty report. Please add some details.

Dear User,

To attempt the free quiz, you are requested to first register on the portal if you are not registered yet. After successful registration, please login using your created username and password.

If you are already registered, please login by entering your username and password.

If you are not registered yet, kindly register first using the registration link given below:

Click here to register: https://yourlearningbuddy.com/registration/

By attempting the quiz, you will be able to analyze your performance and identify your learning gaps for better preparation and improvement.

Username or Email Address

Password

Remember Me

I. Chapter Summary

This chapter introduces students to the classification of matter based on its composition. It explains the differences between elements, compounds, and mixtures, along with their properties and examples. Students learn how substances combine, how mixtures can be separated using physical methods, and why understanding the nature of matter is essential in science, industry, and daily life. The chapter builds a strong foundation for Chemistry concepts in Classes 9–10.

II. Key Concepts Covered

1. Classification of Matter

   • Matter classified as elements, compounds, and mixtures based on composition.

2. Elements

   • Pure substances made of only one kind of atom.

   • Cannot be broken down into simpler substances by chemical means.

3. Compounds

   • Pure substances formed when two or more elements combine chemically in a fixed ratio.

4. Mixtures

   • Combination of two or more substances mixed physically in any ratio.

5. Types of Mixtures

   • Homogeneous mixtures (solutions)

   • Heterogeneous mixtures

6. Differences between Elements, Compounds, and Mixtures

   • Based on composition, properties, and separation methods.

7. Separation of Mixtures (Introductory)

   • Filtration, evaporation, handpicking, sieving, sedimentation.

III. Important Questions

(A) Multiple Choice Questions (1 Mark)

1. Which of the following is a pure substance?

   • (a) Air

   • (b) Salt solution

   • (c) Iron

   • (d) Soil
     ✔ Correct Answer: (c)

2. A compound always has:

   • (a) Variable composition

   • (b) Fixed composition

   • (c) Only one element

   • (d) No definite properties
     ✔ Correct Answer: (b)

3. Which of the following is a homogeneous mixture?

   • (a) Sand and water

   • (b) Oil and water

   • (c) Salt dissolved in water

   • (d) Soil
     ✔ Correct Answer: (c)

4. Which method is used to separate iron filings from sand?

   • (a) Filtration

   • (b) Evaporation

   • (c) Handpicking

   • (d) Magnetic separation
     ✔ Correct Answer: (d)

(Note: Class 8 has no board PYQs; questions are PYQ-pattern based.)

(B) Short Answer Questions (2/3 Marks)

1. Define an element. Give two examples.

2. What is a compound? Write two characteristics.

3. Differentiate between homogeneous and heterogeneous mixtures.

4. Name any two methods of separation of mixtures and explain one briefly.

(C) Long Answer Questions (5 Marks)

1. Explain the differences between elements, compounds, and mixtures with examples.

2. Describe various methods used to separate mixtures with suitable examples.

3. Explain why a compound has properties different from its constituent elements.

4. Classify the following into elements, compounds, and mixtures:

   • Air, Water, Copper, Salt solution, Carbon dioxide

(D) HOTS – Higher Order Thinking Skills

1. Why is air considered a mixture and not a compound?

2. If a substance has a fixed melting point and definite composition, how would you classify it? Justify your answer.

IV. Key Formulas / Concepts

• Element: Pure substance made of one type of atom

• Compound: Chemical combination of elements in fixed ratio

• Mixture: Physical combination of substances in any ratio

• Homogeneous Mixture: Uniform composition

• Heterogeneous Mixture: Non-uniform composition

(No numerical formulas are prescribed in this chapter.)

V. Deleted Portions (CBSE 2025–2026)

No portions have been deleted from this chapter as per the rationalized NCERT textbooks.

VI. Chapter-Wise Marks Bifurcation (Estimated – CBSE 2025–2026)

VII. Previous Year Questions (PYQ-Pattern Based)

(Class 8 has no board exam; listed questions are based on recurring CBSE school exam trends)

1 Mark

• Define an element.

2/3 Marks

• Write two differences between compounds and mixtures.

5 Marks

• Explain methods of separation of mixtures with examples.

VIII. Real-World Application Examples

• Water purification: Filtration and evaporation.

• Cooking: Separation of impurities from grains.

• Industrial chemistry: Use of compounds like cement and fertilizers.

• Air: Used as a mixture in respiration and combustion.

IX. Student Tips & Strategies for Success (Class 8)

Time Management

• Create comparison tables for quick revision.

• Practice classification questions daily.

Exam Preparation

• Learn definitions with examples.

• Focus on differences and reasoning questions.

Stress Management

• Relate concepts to daily life.

• Use diagrams and charts for easy recall.

X. Career Guidance & Exploration

For Classes 9–10

• Foundation for Chemistry, Environmental Science, Material Science.

• Early exposure exams: Science Olympiads, NTSE.

For Classes 11–12

• Career paths:

  • Chemist

  • Chemical Engineer

  • Environmental Scientist

  • Research Scientist

• Entrance exams: JEE, NEET, CUET, IISER Aptitude Test

XI. Important Notes

• NCERT definitions are exam-critical.

• Focus on concept clarity over memorization.

• Regular revision ensures confidence and accuracy.