Class 10 Science Chapter 1 Chemical Reactions and Equations – Handwritten Notes PDF, Important Questions & Answers

Are you preparing for your Class 10 Science Board Examination 2027? Do you want to understand Chemical Reactions and Equations with simple explanations, important chemical equations and exam-oriented questions?

Career Platform Coaching Centre brings you teacher-prepared handwritten notes for Class 10 Science Chapter 1 – Chemical Reactions and Equations.

These notes are prepared by experienced teachers to help students understand important concepts, learn chemical equations and revise the complete chapter effectively.

This study material is useful for students preparing for CBSE Board, State Boards, NIOS and other school examinations.

Class 10 Science Chapter 1 – Chemical Reactions and Equations

Subject: Science
Class: 10th
Chapter: 1
Chapter Name: Chemical Reactions and Equations
Study Material: Teacher-Prepared Handwritten Notes PDF written By Binod SIR (Faculty Career Plaform)

Class 10 Sci Ch1 Chemical Reactions & Equations Part-1

https://drive.google.com/file/d/1mTg-HFQozVna9AsS3NAWX02J874Xllao/view?usp=sharing

Class 10 Sci Ch1 Chemical Reactions & Equations Part-2

https://drive.google.com/file/d/1CArSEyorAZxxUklT19NwDF2vJL7jTbAg/view?usp=sharing

Class 10 Sci Ch1 PYQ (Chemicals Reactions & Equations)

https://drive.google.com/file/d/1ogeGa1KjrBkBSYlLV6oH3860eV1HFdH1/view?usp=sharing

Useful For: CBSE, State Board, NIOS and Other Boards
Academic Session: 2026–27

Why Are These Handwritten Notes Important?

These handwritten notes have been prepared by teachers to make the chapter easier to understand and revise.

Students can use these notes for:

• Understanding important concepts of chemical reactions.
• Learning chemical equations and their balancing.
• Revising important definitions and examples.
• Understanding different types of chemical reactions.
• Preparing for short-answer and long-answer questions.
• Practicing important questions for board examinations.

Important: Students should study the chapter carefully and practice the chemical equations themselves. Questions in examinations may be framed differently from the examples discussed in class.

Topics Covered in Chapter 1 – Chemical Reactions and Equations

The following important topics are covered in this chapter:

1. Chemical Reactions

A chemical reaction is a process in which one or more substances (reactants) are converted into new substances (products) with different properties.

Examples of common signs of a chemical reaction:

• Change in colour.
• Change in state.
• Evolution of a gas.
• Change in temperature.
• Formation of a precipitate.

2. Chemical Equations

A chemical equation represents a chemical reaction using symbols and chemical formulae.

For example:

Magnesium + Oxygen → Magnesium Oxide

2Mg + O₂ → 2MgO

3. Balanced and Unbalanced Chemical Equations

A balanced chemical equation has an equal number of atoms of each element on both sides of the equation.

According to the law of conservation of mass, mass can neither be created nor destroyed in a chemical reaction.

Therefore, balancing chemical equations is an important part of this chapter.

4. Types of Chemical Reactions

Students should understand the following types of chemical reactions:

A. Combination Reaction

Two or more substances combine to form a single product.

Example:

CaO + H₂O → Ca(OH)₂

B. Decomposition Reaction

A single compound breaks down into two or more simpler substances.

Example:

CaCO₃ → CaO + CO₂

C. Displacement Reaction

A more reactive element displaces a less reactive element from its compound.

Example:

Zn + CuSO₄ → ZnSO₄ + Cu

D. Double Displacement Reaction

Two compounds exchange their ions to form new compounds.

Example:

Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl

E. Oxidation and Reduction

Oxidation involves addition of oxygen or removal of hydrogen, while reduction involves removal of oxygen or addition of hydrogen.

Example:

CuO + H₂ → Cu + H₂O

In this reaction, copper oxide is reduced to copper and hydrogen is oxidised to water.

5. Effects of Oxidation in Everyday Life

Two important concepts are:

Corrosion: The gradual destruction of metals due to their reaction with substances present in the environment.

Example: Rusting of iron.

Rancidity: The oxidation of fats and oils in food, which causes unpleasant changes in smell and taste.

Methods to prevent rancidity include refrigeration, airtight packaging and adding suitable antioxidants.

Important Questions – Class 10 Science Chapter 1

Students should practise these important questions for examination preparation.

1. What is a chemical reaction? Give two examples.
2. What are the different observations that indicate a chemical reaction?
3. Why should a magnesium ribbon be cleaned before burning?
4. What is a balanced chemical equation?
5. State the law of conservation of mass.
6. What is a combination reaction? Give an example.
7. Explain decomposition reactions with examples.
8. What is a displacement reaction?
9. Differentiate between displacement and double displacement reactions.
10. What is oxidation? Explain with an example.
11. What is reduction? Give an example.
12. What is corrosion? How can it be prevented?
13. What is rancidity? Mention two methods to prevent it.
14. Why is respiration considered an exothermic reaction?
15. Differentiate between exothermic and endothermic reactions.

Important Chemical Equations for Practice

Students should learn and practise balancing the following equations:

1. Mg + O₂ → MgO
2. Zn + H₂SO₄ → ZnSO₄ + H₂
3. CaCO₃ → CaO + CO₂
4. Fe + CuSO₄ → FeSO₄ + Cu
5. Na₂SO₄ + BaCl₂ → BaSO₄ + NaCl
6. CuO + H₂ → Cu + H₂O
7. H₂ + O₂ → H₂O
8. KClO₃ → KCl + O₂

Remember to balance each equation before considering it complete.

Watch the Complete Chapter Explanation

At Career Platform Coaching Centre, teachers explain important concepts, chemical reactions, equations and examination-oriented questions in a simple and systematic manner.

Students are advised to watch the complete chapter discussion along with the handwritten notes.

Study Strategy:

1. Read the handwritten notes carefully.
2. Understand every chemical reaction.
3. Practise balancing equations daily.
4. Revise important definitions.
5. Solve textbook exercises and previous-year questions.
6. Attempt chapter-based tests for better preparation.

Who Can Use These Notes?

These Class 10 Science Chapter 1 notes are useful for:

• CBSE Class 10 Board Examination 2027.
• Delhi and other State Board examinations.
• NIOS Class 10 Science preparation.
• Other recognised school boards following similar Science topics.
• Students who want to revise Chemical Reactions and Equations.

About Career Platform Coaching Centre

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Our academic programmes include:

• CBSE Classes 6–12.
• Class 9–10 Foundation.
• Class 11–12 PCM and PCB.
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• NEET-UG.
• Olympiad preparation.

Our Motto: Building Concepts, Creating Futures.

Students can follow Career Platform for handwritten notes, chapter discussions, important questions, board examination updates and educational videos.

Final Words

Chemical Reactions and Equations is an important chapter in Class 10 Science. A clear understanding of chemical equations, balancing, types of reactions, oxidation, corrosion and rancidity will help students build a strong foundation in Chemistry.

Study the teacher-prepared handwritten notes, watch the chapter discussion and practise all important equations regularly.

Keep Learning. Keep Practicing. Achieve Success with Career Platform!