DF2- Hess' Law Flashcards
1
Q
What does Hess’ Law state?
A
The enthalpy change in a reaction is independent of the route by which the chemical change takes place
2
Q
What do enthalpy cycles show?
A
- direct and indirect routes by which a chemical reaction can take place
3
Q
Which way to arrows point from intermediate step when using Delta Hf?
A
Towards reactants and products
4
Q
Why can’t enthalpy changes always be measured directly?
A
- high activation energy
- slow rate of reaction
- more than 1 reaction occuring
