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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 is called an exothermic chemical reaction? Give examples.
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Answer

Chemical reaction in which heat is released during the formation of product is called an exothermic reaction.
Examples:
(1) Burning of natural gas:
$CH_4(g)+2 O_2(g) \longrightarrow CO_2(g)+2 H_2 O(g)$
(2) Burning of coal :
$C(s)+O_2(g) \longrightarrow CO_2(g)+\text { Heat }$
(3) Formation of compost manure by decomposition of vegetable matter is also an example of an exothermic reaction.

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