You give my answer but not practically theorically if someone don't know whether the heat will evolved or absorbed then how he will get to know whether the reaction will be exothermic or endothermic?
Asked by Hitesh Suthar | 29th Jun, 2014, 10:07: PM
We have not understood the query that you have posted. We would request you to clarify / provide additional details so that we may answer this to the best of the ability.
The chemical reactions which proceed with the evolution of heat energy are called as exothermic reactions.
Carbon burns in oxygen to form carbon dioxide and heat energy is produced.
C + O2 → CO2 + Heat
Water added to quick lime (calcium oxide), slaked lime (calcium hydroxide) is produced with lot of heat energy.
CaO + H2O → Ca(OH)2 + Heat
The chemical reactions which proceed with the absorption of heat energy are called as endothermic reactions. Sometimes, the beaker in which the reaction mixture is present becomes cold.
Formation of carbon disulphide
C + 2S + Heat → CS2
When nitrogen and oxygen are heated together to a particular temperature of about 3000oC, nitric oxide gas is formed.
N2 + O2 + Heat → 2NO
Answered by Hanisha Vyas | 30th Jun, 2014, 10:54: AM
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