PART - 1 CH - 1 Chemical Reactions and Equations — Science STD 10 — Question
Gujarat BoardEnglish MediumSTD 10SciencePART - 1 CH - 1 Chemical Reactions and Equations3 Marks
Question
What does one mean by exothermic and endothermic reactions? Give examples.
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Answer
Exothermic reaction: A chemical reaction in which heat energy is evolved during the formation of product is called an exothermic reaction. For example, Combustion of natural gas (methane) is an exothermic reaction. $CH _4(g)+2 O _2$ (g) $\rightarrow CO _2(g)+2 H _2 O ( g )+$ heat Endothermic reaction: A chemical reaction in which heat is absorbed during the formation of products is called an endothermic reaction. For example, Decomposition of silver chloride in presence of sunlight is called an endothermic reaction. $2 AgCl ( s ) \xrightarrow{\text { Sunlight }} 2 Ag ( s )+ Cl _2(g)$
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