When a chemical change takes place with the release of heat energy, it is said to be an ______ reaction.
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Solution
Exothermic Reactions
“The chemical reactions in which heat energy is evolved are called exothermic reactions.”
For example, the reaction of Calcium oxide () with water to produce Slaked lime ( or Calcium hydroxide) is an exothermic reaction as the reaction is vigorous and a large amount of heat is evolved.
The burning of candles is also exothermic.
Hence, when a chemical change takes place with the release of heat energy, it is said to be an exothermic reaction.