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Types of Chemical Reaction

Tamil Nadu Board · Class 10 · Science

Complete topic list for Types of Chemical Reaction in Tamil Nadu Board Class 10 Science. Key concepts, sub-topics, and what to focus on for board exams.

45 questions35 flashcards5 concepts

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4 Topics · Tamil Nadu Board Class 10 Science

Topics in Types of Chemical Reaction

1

Chemical Reactions – Basics

  • A chemical reaction involves breaking of old bonds and formation of new bonds.
  • Bond breaking absorbs energy; bond formation releases energy.
  • A chemical equation must be balanced — the number of atoms of each element must be equal on both sides (Law of Conservation of Matter).
2

Types of Chemical Reactions – Classification by Atom Rearrangement

  • There are 5 main types: Combination, Decomposition, Single Displacement, Double Displacement, and Combustion.
  • COMBINATION: Two or more reactants combine to form one product. A + B → AB. Also called synthesis or composition reaction. Most are EXOTHERMIC.
  • 3 Sub-types of Combination: (i) Element + Element → Compound (e.g., S + O₂ → SO₂), (ii) Compound + Element → Compound (e.g., PCl₃ + Cl₂ → PCl₅), (iii) Compound + Compound → Compound (e.g., SiO₂ + CaO
3

Reversible and Irreversible Reactions

  • Based on the DIRECTION of reaction, chemical reactions are classified as reversible and irreversible.
  • REVERSIBLE REACTION: Products can be converted back to reactants under suitable conditions. Represented by a double arrow ⇌.
  • Example: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) — PCl₅ decomposes and reforms continuously.
4

Rate of Chemical Reaction and Factors Affecting It

  • Rate of reaction = change in concentration (or amount) of reactants or products per unit time.
  • Formula: Rate = -d[A]/dt = +d[B]/dt for reaction A → B.
  • The negative sign indicates decrease in reactant concentration; positive sign indicates increase in product concentration.

Key Concepts

A reaction in which twoA single compound breaks down intoA reaction between an elementA reaction between two compounds whereA reaction where a substance rapidly

Frequently Asked Questions

What are the important topics in Types of Chemical Reaction for Tamil Nadu Board Class 10 Science?
Key topics in Types of Chemical Reaction include Types of Chemical Reactions – Chapter Overview, Types of Chemical Reactions - Complete Overview, Classification of Chemical Reactions. These are the concepts Tamil Nadu Board Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Types of Chemical Reaction — Tamil Nadu Board Class 10 Science?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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