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Energy Change Definitions

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Total cards: 9•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (9)

#1
Front (Question)

Define heat of reaction

Back (Answer)

Heat of reaction (delta h) is defined as the net change of chemical potential energy of the system.

#2
Front (Question)

Define exothermic reaction.

Back (Answer)

Exothermic reactions are reactions which transform chemical potential energy into thermal energy.

#3
Front (Question)

Define endothermic reactions.

Back (Answer)

Endothermic reactions are reactions that transform thermal energy into chemical potential energy.

#4
Front (Question)

Is bond breaking endo or exothermic?

Back (Answer)

The breaking of bonds is endothermic whilst the formation of bonds is exothermic.

#5
Front (Question)

Delta H is ___ for endothermic reactions.

Back (Answer)

Positive.

#6
Front (Question)

Delta H is ___ for exothermic reactions.

Back (Answer)

Negative.

#7
Front (Question)

Exothermic reactions ___ ___ and thus ___ the temperature of the reaction mixture.

Back (Answer)

• Release heat 2. Increase

#8
Front (Question)

Endothermic reactions ___ ___ and thus ___ the temperature of the reaction mixture.

Back (Answer)

• Absorb Heat 2. Decrease

#9
Front (Question)

How else can Heat of reaction be presented?

Back (Answer)

Energy of products - energy of reactants.