thermo chem equations(2.2)

Question 1

energy profile diagram

Answer 1

• represents energy changes that occur during the course of a reaction

Question 2

heat content/enthaply

Answer 2

chemical energy of a substance

Question 3

enthaply change/ heat of reaction

Answer 3

the exchange of heat energy between the system an dsurroundings
also known as ΔH

Question 4

enthalpy change reaction

Answer 4

ΔH = Hp – Hr
- within exothermic reactions the ΔH is negative
- withing endothermic reactions the ΔH is positive

Question 5

thermochemical equations

Answer 5

the value of ΔH is in units kJ mol–1

Question 6

activation energy

Answer 6

energy required to break the bonds of reactants
-the barrier that must be overcome before a reaction can get started
- thus, a reaction ant proceeds unless the bonds in the reactant are broken
- can be in both exothermic and endothermic