Chapter 1: Chemical Reactions and Equations

VIGYAN

Chapter 1: Chemical Reactions and Equations Class X Science Characteristics of Chemical Reactions A chemical reaction is characterized by certain observable changes: Formation of a precipitate Evolution of gas Change in colour Change in state Change in temperature Balancing of a Chemical Equation Balancing of a chemical equation means making the number of atoms of each element equal on both sides of the equation. This follows the Law of Conservation of Mass. Steps involved in balancing: Write the word equation. Write the skeletal chemical equation. Enclose the formulae in boxes. List the number of atoms of different elements on LHS (Reactants) and RHS (Products). Select the biggest formula to start balancing. Start balancing different elements which have the highest number of atoms. Check the correctness of the balanced equation. Types of Chemical Reactions 1. Combination Reaction Reactions in which two or more reactants combine to form one product. General Formula: \( A + B \rightarrow AB \) Examples: \( 2M…

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