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Chemical Reactions and Equations

Gujarat Board · Class 10 · Science

Quick revision notes for Chemical Reactions and Equations — Gujarat Board Class 10 Science. Key concepts, formulas, and definitions for last-minute revision.

59 questions30 flashcards5 concepts

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An illustration showing common daily life situations where chemical reactions occur, such as milk turning sour, iron rusting, grapes fermenting, food cooking, food digestion, and respiration.
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Key Topics to Revise

1

Chemical Equations – Writing and Balancing

  • A chemical reaction is identified by: change in state, change in colour, evolution of a gas, or change in temperature.
  • A word equation shows reactants on the left-hand side (LHS) and products on the right-hand side (RHS), separated by an arrow (→).
  • A chemical equation uses chemical symbols and formulae instead of names of substances.
2

Types of Chemical Reactions

  • There are 5 main types of chemical reactions: Combination, Decomposition, Displacement, Double Displacement, and Oxidation-Reduction (Redox).
  • COMBINATION REACTION: Two or more reactants combine to form a single product. A + B → AB.
  • DECOMPOSITION REACTION: A single reactant breaks down into two or more products. AB → A + B. It is the opposite of combination.
3

Effects of Oxidation – Corrosion and Rancidity

  • Corrosion is the slow eating away of metals due to reaction with moisture, oxygen, or acids in the environment.
  • Rusting of iron is the most common example of corrosion: Iron + Water + Oxygen → Rust (hydrated iron oxide, Fe₂O₃·xH₂O).
  • Silver tarnishes to form a black coating (silver sulphide, Ag₂S); copper forms a green coating (copper carbonate/basic copper carbonate).

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Full Notes

Key Concepts

A chemical reaction is a processA chemical equation is a symbolicBalancing a chemical equation means adjustingA combination reaction occurs when twoA decomposition reaction is the opposite

Frequently Asked Questions

What are the important topics in Chemical Reactions and Equations for Gujarat Board Class 10 Science?
Key topics in Chemical Reactions and Equations include Chemical Reactions and Equations - Comprehensive Overview, Chemical Reactions and Equations – Complete Chapter Overview, Chemical Reactions and Equations - Complete Overview. These are the concepts Gujarat Board Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Chemical Reactions and Equations — Gujarat Board Class 10 Science?
Understand the core concepts first, then work through the 59 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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