D = Bond energy

Question 1

What will the change in energy value be if the reaction is:

1-Exothermic
2-Enothermic

Answer 1

1 = -delta H value

2 = +delta H value

Question 2

Change in energy = ?

Answer 2

Change in energy = bonds broken +(-bonds formed)

Units = KJ/mol

Question 3

Steps for a bond energy calculation?

Answer 3

1-Balanced symbol equation

2-Write the reaction as the bonds (the picture bit)

3-Look at the table provided for the bond energy values

4-Change in energy = bonds broken +(-bonds formed)

Units = KJ/mol

Question 4

Reactants and products of reactions that are:

1-Exothermic

2-Endothermic

Answer 4

1- More reactants than products

2-More products than reactants