Energy Changes

Question 1

Exothermic reaction

Answer 1

A reaction in which heat is released to the surrounding.

Question 2

Endothermic reaction

Answer 2

A reaction in which heat is absorbed from the surroundings.

Question 3

Enthalpy Change of Reaction, [Change] H

Answer 3

The amount of energy involved in a chemical reaction is known as the enthalpy change of the reaction.

It represents the difference in energy content of the reactants and products.

Question 4

Bond energy

Answer 4

The average amount of heat absorbed to break one mole of that particular X-Y bond in a particular compound in the gaseous state.

Question 5

In order for a reaction to take place,

Answer 5

The particles must be correctly oriented,

The collision must occur with a minimum amount of energy

Question 6

Activation Energy, Ea

Answer 6

The minimum energy that is needed by the reactant particles in order for a chemical reaction to occur.