Question

Classify the following reaction as an exothermic or an endothermic reaction.

1. Magnesium ribbon when burned in air, it forms magnesium oxide.
2. \[\ce{HCl + NaOH → NaCl + H2O + Heat}\]
3. \[\ce{2KClO3_{(s)} ->[Δ] 2KCl_{(s)} + 3O2}\]
4. \[\ce{CaO + H2O → Ca(OH)2 + Heat}\]
5. \[\ce{CaCO3_{(s)} ->[Δ] CaO_{(s)} + CO2}\]

Answer 1

Reaction	Classification
Magnesium ribbon when burned in air, it forms magnesium oxide.	exothermic
\[\ce{HCl + NaOH → NaCl + H2O + Heat}\]	exothermic
\[\ce{2KClO3_{(s)} ->[Δ] 2KCl_{(s)} + 3O2}\]	endothermic
\[\ce{CaO + H2O → Ca(OH)2 + Heat}\]	exothermic
\[\ce{CaCO3_{(s)} ->[Δ] CaO_{(s)} + CO2}\]	endothermic