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Chemical Reactions

ICSE · Class 8 · Chemistry

Quick revision notes for Chemical Reactions — ICSE Class 8 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

63 questions40 flashcards5 concepts

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Key Topics to Revise

1

1. Chemical Reaction and Its Signs

  • A chemical reaction changes substances into new substances with different properties.
  • Reactants are the substances that take part in a reaction.
  • Products are the new substances formed in a reaction.
2

2. Conditions Needed for Reactions

  • Some reactions need close contact between reactants.
  • Some reactions happen faster in solution form.
  • Some reactions need heat energy.
3

3. Catalysts and Enzymes

  • Manganese dioxide is a positive catalyst.
  • Manganese dioxide mixed with potassium chlorate in the ratio 1:4 lowers the decomposition temperature from 700°C to about 300°C.
  • Manganese dioxide remains unaffected in the reaction.
4

4. Types of Chemical Reactions

  • The four main types of chemical reactions are combination, decomposition, displacement, and double displacement.
  • Combination reaction means two or more substances combine to form one substance.
  • Decomposition reaction means one compound breaks into simpler substances on heating.

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Full Notes

Key Concepts

A chemical reaction is a chemicalA reaction involves breaking chemical bondsImportant signs include evolution of gasA combination reaction is oneA decomposition reaction is one

Frequently Asked Questions

What are the important topics in Chemical Reactions for ICSE Class 8 Chemistry?
Chemical Reactions covers several key topics that are frequently asked in ICSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Chemical Reactions — ICSE Class 8 Chemistry?
Understand the core concepts first, then work through the 63 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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