Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
Answer
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COMBINATION REACTION |
DECOMPOSITION REACTION |
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Two or more substances react to form a single product in a Combination Reaction . |
A single reactant breaks down into more than one product in a Decomposition Reaction. |
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Usually, heat or energy is produced in such reactions. |
Usually, heat or energy is used in such reactions. |
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General equation: A + B → C |
General equation: A → B + C |
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Example: CaO(s) + H 2 O(l) → Ca(OH) 2 (aq) |
Example: CaCO 3 (s) → CaO(s) + CO 2 (g) |
In the above two reactions, since the mechanism is opposite , they are called opposite reactions.
