Enthalpy Flashcards
(15 cards)
What is enthalpy
All the heat energy that is stored in a chemical system
Where is the enthalpy change on a profile
How do you show that it is negative
The difference between the reactants and the products
Downward pointing arrow
What is the energy profile for this reaction
What is the symbol for enthalpy
H
What is the rule with representing Ea on a profile
Upwards pointing arrow
What is the symbol for standard conditions
What is standard temperature, pressure and concentration
Temperature - 298 K
Pressure - 100kPa
Concentration - 1mol/dm^3
What is the symbol and unit for standard enthalpy change
kJ mol^-1
What are the four standard enthalpy changes
Standard enthalpy change of combustion
Standard enthalpy change of neutralisation
Standard enthalpy change of formation
Standard enthalpy change of reaction
What is the symbol for standard enthalpy change of combustion
What is the standard enthalpy change of combustion
The enthalpy change when one mole of a substance reacts completely with oxygen under standard conditions and all their chemicals are in their standard states
What is standard enthalpy change of neutralisation
The enthalpy change when one mole of water is formed in a neutralisation reaction under standard conditions and when all the chemicals are in their standard states
What is the standard enthalpy change of neutralisation of a reaction that includes any strong acid and any strong alkali
The value is -57 kJ mol^-1
What is the standard enthalpy change of formation
The enthalpy change when one mole of a compound is formed from its elements under standard conditions and all of the chemicals are in their standard states
What is the standard enthalpy change of reaction
The enthalpy change in the molar quantities shown by the balanced chemical equation under standard conditions and when all the chemicals are in their standard states
