Energetics Flashcards
1
Q
Why is enthalpgy
A
Measuring change of heat at constant pressure
2
Q
What is standard enthalpy for combustion
A
Enthalpy change when one mole of substance is Burt completely in oxygen in standard states and conditions
3
Q
What is enthalpy of formation
A
Enthalpy change when mole of a compunction is formed from its constituent elements in standard states and conditions
4
Q
How to decrease error in enthalpy experiment
A
Make sure enough oxygen and not incomplete combustion Use polystyrene cup Use a lid Reduce the distance Increase mass of water
5
Q
What is Hess law
A
The enthalpy change whatever the route to get from recactants to products in a chemical reaction
6
Q
What is mean bond enthalpy
A
Avg enthalpy change needed to break the covalent bond across a range of divergent compunds
