Subjective Type

a) Why are decomposition reactions called the opposite of combination reactions? Explain with equations of these reactions. b) Express the following facts in the form of a balanced chemical equation: "When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed".

Solution

Those reactions in which a compound splits up into two or simpler substances are known as decomposition reactions.
Example: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.

$$CaCO_3\xrightarrow[(Decomposition)]{Heat}CaO$$ $$+$$ $$CO_{2(g)}$$
Calcium carbonate Calcium oxide Carbon dioxide
(Limestone) (Lime)

They are called opposite of combination reactions because, in a combination reaction, two or more substances combine to form a single substance.
Example: Magnesium and oxygen combine when heated formed magnesium oxide.

a) $$2Mg_{(s)} +O_2\overset{Combination}{\longrightarrow}2MgO_{(s)}$$
Magnesium Oxygen Magnesium Oxide


b) $$Cu_{(s)} +2AgNO_{3(aq)} \rightarrow Cu(NO_3)_{2(aq)} +2Ag_{(s)}$$

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