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)
Chemistry - AS Level
flashcards
Decks in class (39)
# Cards
-
EL 113
-
EL 216
-
EL 3 & 423
-
EL 528
-
EL 65
-
EL 752
-
EL 7 (part 2)48
-
EL 840
-
EL 913
-
DF 19
-
DF 23
-
DF 32
-
DF 42
-
DF 513
-
DF 623
-
DF 79
-
DF - Alkanes26
-
DF - Alkenes19
-
DF - Enthalpy Changes15
-
ES 133
-
ES 223
-
ES 313
-
ES 413
-
ES 52
-
ES 622
-
ES 715
-
ES Flashcards58
-
ES - Redox1
-
ES - Halogenalkanes6
-
ES - Electron Structure11
-
ES - Rates And Equilibris30
-
OZ - Chemistry Of The Air16
-
OZ - Periodicity16
-
OZ - Structure And Bonding14
-
Bond shapes7
-
Flame colours8
-
WM24
-
WM54
-
WM Flashcards17
