2.8.4 Bond Enthalpies

Question 1

What do we always know the value of bond enthalpy will be?

Answer 1

We know it will always be positive because energy is required to break the bonds

Question 2

What are bond enthalpies dependent on?

Answer 2

Bond enthalpy values are dependent on the attraction between the nuclei and the electrons of the atom

Question 3

What is mean bond enthalpy?

Answer 3

Mean bond enthalpy is an average bond enthalpy across a range of molecules

Question 4

What is the equation to work out the standard enthalpy?

Answer 4

Standard enthalpy = energy released from making products - energy released from breaking reactants

Question 5

What is the definition of ‘bond enthalpies’?

Answer 5

Bond enthalpy is the standard enthalpy change associated with breaking one mole of bonds in a gaseous substance into gaseous atoms