Energetics

HideShow resource information
Define Enthalpy Change
The heat energy transferred in a reaction at constant temperature and pressure
1 of 10
Define Standard Enthalpy of Formation
The enthalpy change when one mole of a substance is formed from its elements. All reactants and products in their standard states under standard conditions
2 of 10
Define Standard Enthalpy of Combustion
The enthalpy change when one mole of a substance is combusted completely in oxygen. All reactants and products in their standard states under standard conditions
3 of 10
Define Mean Bond Enthalpy
The average enthalpy change needed to break a covalent bond, averaged over a large number of different molecules
4 of 10
How do you calculate enthalpy change given bond enthalpy data?
BERP Reaction = Reactants - Products
5 of 10
How do you calculate enthalpy change given formation data?
FliPpeR Reaction = Products - Reactants
6 of 10
How do you calculate enthalpy change given combustion data?
CRoPs Reaction = Reactants - Products
7 of 10
Define Hess's Law
The enthalpy change of a reaction is independent of the route taken provided the conditions are kept the same
8 of 10
What is the value of the enthalpy of formation for elements? Why?
0 - because there is no change
9 of 10
Why is it not possible to measure the enthalpy change for combustion reactions?
Cannot ensure that complete/incomplete combustion always occurs
10 of 10

Other cards in this set

Card 2

Front

The enthalpy change when one mole of a substance is formed from its elements. All reactants and products in their standard states under standard conditions

Back

Define Standard Enthalpy of Formation

Card 3

Front

The enthalpy change when one mole of a substance is combusted completely in oxygen. All reactants and products in their standard states under standard conditions

Back

Preview of the back of card 3

Card 4

Front

The average enthalpy change needed to break a covalent bond, averaged over a large number of different molecules

Back

Preview of the back of card 4

Card 5

Front

BERP Reaction = Reactants - Products

Back

Preview of the back of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Energetics resources »