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Chemical Reaction and Equations

NIOS · Class 10 · Science & Tech

Quick revision notes for Chemical Reaction and Equations — NIOS Class 10 Science & Tech. Key concepts, formulas, and definitions for last-minute revision.

45 questions36 flashcards5 concepts

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A comparison diagram illustrating the differences between physical changes (e.g., melting ice, boiling water, tearing paper) where no new substance is formed, and chemical changes (e.g., burning wood,
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Key Topics to Revise

1

1. Chemical Changes and Chemical Equations

  • Physical changes are temporary and the substance returns to its original form.
  • Chemical changes are permanent and cannot be reversed to the original substance.
  • In a chemical equation, reactants are written on the left and products on the right.
2

2. Balancing Equations and Important Conditions

  • The Hit and Trial method is used for balancing equations.
  • Start with the compound containing the maximum number of atoms.
  • Balance one element at a time.
3

3. Mole, Mass, and Volume Relations

  • 6.022 x 10^23 molecules of any substance constitute one mole.
  • A balanced equation shows the mole ratio of reactants and products.
  • For gases, the volume ratio follows the coefficients when temperature and pressure are the same.
4

4. Types of Chemical Reactions

  • The main types are combination, decomposition, displacement, and double displacement reactions.
  • A combination reaction forms one product from two or more reactants.
  • A decomposition reaction breaks one compound into two or more substances.

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Full Notes

Key Concepts

A chemical equation is a symbolicA balanced equation has the sameAn equation with unequal numbersBalancing is done by changing onlyA single product is formed from

Frequently Asked Questions

What are the important topics in Chemical Reaction and Equations for NIOS Class 10 Science & Tech?
Key topics in Chemical Reaction and Equations include Chemical Reactions and Equations - Concept Overview, Chemical Reactions and Equations - Chapter Overview, Chemical Reactions and Equations Overview. These are the concepts NIOS Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Chemical Reaction and Equations — NIOS Class 10 Science & Tech?
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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