Bonds & Energy Changes Flashcards

All 4 cards in this deck

Is the breaking of bonds endothermic or exothermic?

Endothermic — heat energy must be taken in to break bonds.

Is the making of bonds endothermic or exothermic?

Exothermic — heat energy is given out when bonds form.

In terms of bonds, when is the overall heat energy change for a reaction exothermic?

When more heat energy is released in forming bonds in the products than is required to break bonds in the reactants.

True or false? If more heat energy is needed to break the bonds in the reactants than is released when bonds form in the products, the reaction is exothermic.

False. The reaction is endothermic, because less energy is released than is taken in.