Enthlapy Change Flashcards
What is the definition of enthalpy
The total energy in the system
Definition of exothermic
A reaction where the reactants have more energy than the products and energy is released into the surroundings
Definition of endothermic
A reaction where the reactants have less energy than than the products and energy is taken in
Activation energy
The minimum required energy to start a reaction
Definition of standard conditions and states
The atmosphere of pressure where liquids and gases be pure, and that solution be at 1M concentration
Enthalpy change of reaction definition
The total amount of energy lost or gained in a reaction
Enthalpy change of formation definition
When 1 mol of a compound is formed from its constituent elements in there standard states
Enthalpy change of combustion definition
The total energy given out when 1 mol of a substance is completely burned in its standard states
Enthalpy change of neutralisation definition
The enthalpy change when solution of acid and alkali react under there standard condition to produce 1 mol of water
Average bond enthlapy
When 1 mol of gaseous bonds are broken
Enthalpy change per mol calculation
ΔH= q/moles
Enthalpy change in joules
q= mcΔT
Why is energy released into the surrounding during an exothermic reaction
More energy is released when making the new ones than is absorbed when breaking the old ones
Why is heat taken in during an endothermic reaction
This is because more energy is used in breaking the bonds in the reactants than is released when the new ones are formed
