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Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
Chemical Reactions and Equations
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03/09/2021 5:14 pm
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Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
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03/09/2021 5:17 pm
Decomposition reactions are called the opposite of combination reactions because of the following:
- In decomposition reactions, larger molecules break to give simple molecules while in combination reactions, two or more smaller.
- elements compounds combine to form new compounds.
- Decomposition reactions are endothermic while most of the combination reactions are exothermic.
For example:
Combination reaction
2H2(g) + O2(g) + Heat ➝ 2H2O(l)
H2(g) + Cl2(g) + Sunlight ➝ 2HCl(g)
Decomposition reaction
CaCO3(s) ➝ CaO(s) + CO2(g)
2Pb(NO3)2(s) ➝ 2PbO(s) + 4NO2(g) + O2(g)
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