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3 years ago

6

Which of these is an indication that a chemical reaction has occurred? A.Melting of a substance B.Boiling of a substance C.Forma

tion of a gas D.Freezing of a substance

1 answer:

podryga [215]3 years ago

7 0

The answer is formation of gas because melting, boiling, and freezing are only property changes

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3 years ago

PLZ HELP For the reaction: 2NO2(g) → N2O4(l),

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It is calculated by subtracting the enthalpy of reactants from the enthalpy of products.

$\Delta H=H_{products}-H_{reactants}$

$\Delta H$ = enthalpy change = ?

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$H_{reactants}$ = enthalpy of reactants

For the given reaction :

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3 years ago

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Explanation:

hope this helps :).

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