energetics

Question 1

Enthalpy change

Answer 1

Enthalpy change is the amount of heat energy taken in or given out from the surroundings during a reaction at a constant pressure

Question 2

In an exothermic reaction energy is transferred from the

Answer 2

system to the surroundings.
The products have less energy than the reactants

Question 3

In an exothermic reaction the change in heat energy is

Answer 3

negative

Question 4

In an exothermic reaction the energy is transferred from the

Answer 4

surroundings to the system.
The products have more energy than the reactants.

Question 5

In an endothermic reaction the change in heat energy is

Answer 5

positive