exam questions Flashcards
1
Q
state the standard conditions for enthalpy measurements
A
25 degrees
100Kpa
2
Q
suggest whether the enthalpy change of vaporisation of bromine is exo or endothermic
A
- endothermic
- energy is required to overcome london forces
3
Q
explain in terms of bond breaking/forming why a reaction can be exothermic
A
- more energy is released in making bonds
- than is required to break bonds
4
Q
suggest why the calculated value for a combustion enthalpy change may be different to a data book value
A
- heat loss
- incomplete combustion
5
Q
explain in terms of bond breaking/making why the enthalpy change of formation can be endothermic
A
- more energy is required to break bonds
- than is released in making bonds
