Bond Energies ( 14.1 )

Question 1

is bond making endothermic or exothermic

Answer 1

bond making is exothermic

Question 2

is bond breaking endothermic or exothermic

Answer 2

bond breaking is endothermic

Question 3

what does bond breaking require

Answer 3

bond breaking requires energy thus making it endothermic

Question 4

what does bond making do

Answer 4

bond making releases energy thus making it exothermic

Question 5

what is bond energy

Answer 5

this is the measurement of the strength of chemical bonds

Question 6

what is the unit of bond energy

Answer 6

kj/mol

Question 7

what is the equation of energy change

Answer 7

energy change = total bond energies of reactants - total bond energies of products

Question 8

In a reaction, the total bond energies of the reactants was 29kJ/mol. The bond energies of the products were 1kJ/mol, 4kJ/mol and 9kJ/mol. What was the energy change?

Answer 8

29 - ( 1 + 4 + 9 )

answer = 15kj/mol

Question 9

when is a reaction endothermic

Answer 9

if the total energy released by forming bonds is less than total energy required to break bonds.