MediumChemistryHigh School (9–10)GeneralChemical Reactions › Types of Chemical ReactionsConceptual

Name the kind of energy that causes each decomposition.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

$2\text{KClO}_3 \rightarrow 2\text{KCl} + 3\text{O}_2$ , in a hot test tube
$2\text{NaCl} \rightarrow 2\text{Na} + \text{Cl}_2$ , from molten salt with a current
$2\text{H}_2\text{O}_2 \rightarrow 2\text{H}_2\text{O} + \text{O}_2$ , faster in sunlight, which is why it is sold in dark bottles

Need a reminder? The key ideaShow

Combination: $\text{A} + \text{B} \rightarrow \text{AB}$ . Decomposition: $\text{AB} \rightarrow \text{A} + \text{B}$ , by heat, light or electricity. Displacement: $\text{A} + \text{BC} \rightarrow \text{AC} + \text{B}$ , when A is more reactive. Double displacement: $\text{AB} + \text{CD} \rightarrow \text{AD} + \text{CB}$ , often with a precipitate.

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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← Name the type of each reaction. 2CO + O₂ → 2CO₂; 2HgO → 2Hg + O₂; Mg + CuSO₄ → MgSO₄ + Cu; KCl +…Quicklime, CaO, is added to water to make slaked lime. →

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Name the kind of energy that causes each decomposition.

The worked solution

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