bond enthalphy

Question 1

straight chain alkane bond enthalphy

Answer 1

If you plot against the number of carbon atoms in the molecule, for straight chain alkanes, you get a straight line graph, this is because the bond energy increases the same amount as we are adding an extra alkyl group.

Question 2

Bond dissociation enthalpy is

Answer 2

defined as the enthalpy change required to break a covalent bond with all species in
the gaseous state.

Question 3

C- H, may have slightly different bond enthalpies so you would use

Answer 3

the mean bond enthalpy

Question 4

hess law

Answer 4

The fact that you get our rhe same amount of energy when

you make a bond, as you pur in co break it is an example of Hess’s law.