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Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
Decomposition reactions: The reactions in which a compound splits up into two or more simpler substances when energy is provided to it is known as decomposition reactions.
Example: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.
$CaCO_{3}\xrightarrow{Heat} CaO+CO_{2}$
Combination reactions: A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product).
It may be presented in the following form A + B →AB.
eg: H2 + Cl2 → 2HCl
REACTANT 1 + REACTANT 2 → PRODUCT
Decomposition reactions are called the opposite of combination reactions because, in a combination reaction, two or more substances combine with the release of energy to form a single substance.
Example: Carbon combines with oxygen to produce carbon dioxide and energy is released in this process.
$C\ ( s) \ +\ O_{2} \ ( g) \ \rightarrow \ CO_{2} \ +\ Heat$
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