Chapter 5 of 20
Revision Notes
Chemical reactions and equations — Revision Notes
Maharashtra Board · Class 10 · Science
Chemical reactions and equations revision notes for Maharashtra Board Class 10 Science: 4 topics in quick points.
45 questions44 flashcards5 concepts
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Key Topics to Revise
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1. Chemical Reaction and Chemical Equation
- A chemical reaction is a process in which some substances undergo bond breaking and are transformed into new substances by formation of new bonds.
- Reactants are the substances taking part in a chemical reaction.
- Products are the substances formed as a result of a chemical reaction.
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2. Balancing Chemical Equations
- An equation is balanced when the number of atoms of each element is the same on both sides.
- Balancing is done by trial and error using whole-number factors.
- The formula of a compound must not be changed while balancing.
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3. Types of Chemical Reactions
- Chemical reactions are mainly classified as combination, decomposition, displacement, and double displacement reactions.
- When two or more reactants combine to form a single product, it is a combination reaction.
- When one reactant gives two or more products, it is a decomposition reaction.
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4. Heat Changes in Reactions and Processes
- Endothermic processes absorb heat from outside.
- Exothermic processes give out heat.
- Melting of ice and dissolution of potassium nitrate in water are endothermic processes.
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Full NotesKey Concepts
A chemical reaction is a processA chemical reaction can be writtenAn equation is balanced ifWhen two or more reactants combineWhen a single reactant gives rise
Frequently Asked Questions
What are the important topics in Chemical reactions and equations for Maharashtra Board Class 10 Science?
Key topics in Chemical reactions and equations include Chemical Reaction and Chemical Equation, Balancing Chemical Equations, Types of Chemical Reactions, Heat Changes in Reactions and Processes. Study these first, then practise questions on each for the Maharashtra Board Class 10 board exam.
How should I revise Chemical reactions and equations for the Maharashtra Board Class 10 board exam?
Learn the core ideas first, then work through the 45 practice questions on Chemical reactions and equations. Revise 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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