In the following chemical equation: a + b + c d + heat
does product d have more or less energy when compared to a, b, and c combined?

 less

Explanation:

Chemical equation:

A + B + C  → D = Heat

A chemical reaction in which heat is released is exothermic reaction. The reaction is exothermic when the energy of product is less than energy of reactant.

Exothermic reaction:

The type of reactions in which energy is released are called exothermic reactions.

In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.

For example:

Chemical equation:

C + O₂   →  CO₂

ΔH = -393 Kj/mol

it can be written as,

C + O₂   →  CO₂ + 393 Kj/mol

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increased stability in the completion of fluorine's outer shell.