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Why are decomposition reactions called t...

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

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In a combination reaction, two or more substances combine to form a single product. Also, a large amount of heat is evolved.
The decomposition reactions require energy either in the form of heat, light or electricity for breaking down one substance into two or more substances.
`N_(2)+3H_(2)rarr2NH_(3)+"Heat"`, Combination reaction
`2NH_(3)+"Heat"rarrN_(2)+3H_(2)`, Decomposition reaction
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  10. Why is respiration considered an exothermic reaction? Explain.

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  11. Why are decomposition reactions called the opposite of combination rea...

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  12. Write one equation each for decomposition reactions where energy is su...

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