Energetics Flashcards
1
Q
Enthalpy change
A
The heat change of a reaction at constant pressure
2
Q
∆°H
A
Readings taken in standard condition
3
Q
Standard conditions (2)
A
Temp: 298K (25 °C)
Pressure: 101kPa
4
Q
Endothermic characteristics (5)
A
Solution gets cooler
Reaction absorbs energy from surroundings
Bond breaking
Enthalpy change is positive meaning products have higher energy than reactants
Eg. Thermal decomposition
5
Q
Exothermic characteristics (5)
A
Solution gets warmer
Reaction releases energy into surroundings
Bond making
Negative change in Enthalpy meaning products have lower energy than reactants
Eg. Combustion
6
Q
Bond Enthalpy
A
Amount of energy needed to break one mole of a bind type in a molecule in a gaseous state
