What is exothermic reaction? Which of this communication s an exothermic reaction
a. Heating calcium carbonate
b. Adding water to calcium oxid
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Exothermic Reaction
These are types of reactions where along with products, heat is also generated. For example, in the above reaction between calcium oxide and water, a large amount of heat gets produced making the reaction mixture warm. Other examples of exothermic reactions are –
Burning of natural gas
CH4(g) + 2O2 (g) → CO2 (g) + 2H2O (g)
The formation of slaked lime (calcium hydroxide, Ca(OH)2) when water is added to lime (CaO) is exothermic. Formation of water from molecular hydrogen and oxygen and the formation of a metal oxide such as calcium oxide (CaO) from calcium metal and oxygen gas are examples.
CaO + H20 ---> Ca(OH)2 used for painting
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