- Endothermic reaction is a chemical reaction that absorbs heat from surroundings.
- When energy is taken from the surrounding during a chemical reaction, the temperature of the surrounding will decrease.
Example of Endothermic Reaction
|Decomposition of carbonate metal by heat|
Decomposition of calcium carbonate by heat
CaCO3 → CaO + CO2
|Decomposition of nitrate metal by heat|
Decomposition of Lead Nitrate by Heat
2Pb(NO3)2 → 2PbO + 4NO2 + O2
|Dissolve potassium nitrate, ammonium nitrate or ammonium chloride in water.|
KNO3 + Water → K+ + NO3–
NH4NO3 + Water → NH4+ + NO3–
NH4Cl + Water → NH4+ + Cl-
|Reaction of heat on hydrated copper(II) sulphate.|
CuSO4•xH2O → CuSO4 + xH2O