Energy Changes in Chemical Reactions (3)

Chemistry

Not quite remember

I easily remember

Example of endothermic reactions (4)

Dissolving ammonium salts in water

Definition of heat of reaction, ΔH

Is the heat change of one mole of reactant that reacts or one mole of product that is formed

Symbol of heat of reaction

ΔH

Unit of heat of reaction, ΔH

kJ mol−1

Heat of reaction when when heat is released to the surroundings

Heat of reaction, ΔH is negative sign

Heat of reaction when when heat is absorbed from the surroundings

Heat of reaction, ΔH is given a positive sign

The symbol Δ, delta

Is the fourth letter in the Greek alphabet that denotes difference or change

The energy change in a chemical reaction

Can be represented using an energy level diagram

The energy level diagram

Shows the difference in the heat energy content between the reactants and the products

Example of energy level diagram for an exothermic reaction

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