Chemical Decomposition Reactions

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Questions and Answers

Calcium hydroxide reacts rapidly with carbon dioxide.

False (B)

What is the result of applying heat to mercuric oxide?

It forms a solid compound
It forms calcium carbonate
It breaks into mercury and oxygen (correct)
It reacts with carbon dioxide

What gas is involved in the decomposition of calcium hydroxide?

carbon dioxide

Mercuric oxide decomposes into _ and _.

<p>mercury, oxygen</p> Signup and view all the answers

Match the following compounds with their resulting elements upon decomposition:

<p>Calcium hydroxide = Carbon dioxide and calcium carbonate Mercuric oxide = Mercury and oxygen Calcium carbonate = Calcium oxide and carbon dioxide</p> Signup and view all the answers

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Study Notes

Chemical Decomposition Reactions

A chemical decomposition reaction occurs when a single compound breaks down into two or more simpler substances.
Example 1: Slaked lime, applied to building walls, reacts slowly with carbon dioxide in the air to form a thin layer of calcium carbonate. This is a decomposition reaction as calcium carbonate is formed from slaked lime and carbon dioxide.
Example 2: Heating mercuric oxide leads to its decomposition into the elements mercury and oxygen.