Chemical reactions and equations — Chapter Summary
Maharashtra Board · Class 10 · Science
Summary of Chemical reactions and equations for Maharashtra Board Class 10 Science. Part of the Maharashtra Board Class 10 Science syllabus.
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Overview
Notice how a blue solution can turn colourless, how a white precipitate can form, and how heat can be released or absorbed. These changes show that substances can break old bonds and form new ones. Count the atoms on both sides of an equation, watch the state symbols, and track which reactions give
Key Concepts
A chemical reaction is a process
A chemical reaction is a process in which some substances undergo bond breaking and are transformed into new substances by formation of new bonds. Rea
A chemical reaction can be written
A chemical reaction can be written in a condensed form using chemical formulae. Reactants are written on the left, products on the right, and an arrow
An equation is balanced if
An equation is balanced if the number of atoms of each element is the same on both sides. Balancing is done by changing factors, not by changing the f
When two or more reactants combine
When two or more reactants combine to form a single product, it is a combination reaction. Examples include NH3(g) + HCl(g) → NH4Cl(s), 2Mg + O2 → 2Mg
When a single reactant gives rise
When a single reactant gives rise to two or more products, it is a decomposition reaction. It may happen by heat or electricity. Examples include CaCO
Learning Objectives
- Understand what a chemical reaction is and how it differs from a physical change
- Write chemical reactions as word equations and chemical equations
- Use symbols for physical states, heat, gas formation, and precipitates
- Balance simple chemical equations using whole-number factors
- Identify combination, decomposition, displacement, and double displacement reactions
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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