DF 1 Flashcards
1
Q
What is enthalpy change?
A
The heat energy transferred in a reaction at constant pressure
2
Q
Unit for enthalpy change
A
KJ / mol
3
Q
What are the standard conditions for enthalpy change?
A
298K and 100KPa
4
Q
Degrees Celsius -> K
A
+ 273
5
Q
When is change in enthalpy negative?
A
When the reaction is exothermic
6
Q
What is an exothermic reaction?
A
A reaction that gives out energy and heats the surroundings
7
Q
What types of reactions are usually exothermic?
A
Combustion and oxidation
8
Q
What is the standard enthalpy change of formation of a pure element in its standard state?
A
0
9
Q
Delta H =
A
H(products) - H(reactants)
