Medium
$(a)$ Classify the following chemical reactions as exothermic or endothermic:
$(i)$ Electrolysis of water
$(ii)$ Burning of natural gas
$(iii)$ Decomposition of calcium carbonate
$(iv)$ Burning of magnesium ribbon in air.
$(i)$ Electrolysis of water
$(ii)$ Burning of natural gas
$(iii)$ Decomposition of calcium carbonate
$(iv)$ Burning of magnesium ribbon in air.
(N/A) $(i)$ Electrolysis of water is an endothermic reaction because it requires electrical energy to break the bonds of water molecules.
$(ii)$ Burning of natural gas (methane) is an exothermic reaction as it releases a large amount of heat energy during combustion.
$(iii)$ Decomposition of calcium carbonate is an endothermic reaction because it requires heat energy to decompose into calcium oxide and carbon dioxide.
$(iv)$ Burning of magnesium ribbon in air is an exothermic reaction as it releases heat and light energy during the formation of magnesium oxide.
$(ii)$ Burning of natural gas (methane) is an exothermic reaction as it releases a large amount of heat energy during combustion.
$(iii)$ Decomposition of calcium carbonate is an endothermic reaction because it requires heat energy to decompose into calcium oxide and carbon dioxide.
$(iv)$ Burning of magnesium ribbon in air is an exothermic reaction as it releases heat and light energy during the formation of magnesium oxide.
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$(ii)$ sublimation of silver chloride
$(iii)$ decomposition of chlorine gas from silver chloride
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