Question

state two endothermic and exothermic reactions

Answer 1

Exothermic
2Na+Cl² - 2NaCl
HCl+NaOH-NaCl+H²O
Endothermic
CaCO3 (+ heat energy) ==> CaO + CO2
C8H18 ==> C6H14 + C2H4
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Answer 2

A change that occurs with the absorption of heat is called an endothermic change.

Examples:

Melting of ice
Evaporation of spirit.

On the other hand , a change that occurs with the production of heat is called an exothermic change.

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Examples:

Burning of matchstick
Glowing of an electric bulb.

Reactions:

Endo.

2Na + Cl 2 - 2NaCl
HCl + NaOH - NaCl. +H2O

Exo.

Ca CO3 = CaO +CO2
C8H18= C6H14+C2H4