5.2.2 - bond breaking and making

Question 1

what does bond breaking mean for heat energy and what type of reaction is it

Answer 1

heat energy is absorbed

endothermic reaction

Question 2

what does bond making mean for heat energy and what type of reaction is it

Answer 2

heat energy is released

exothermic reaction

Question 3

for each bond what is the amount of heat energy is releases or absorbs called

Answer 3

bond energy (BE)

Question 4

what are the units of bond energy

Answer 4

kJ/mol

Question 5

how can the enthalpy change of a reaction be calculated

Answer 5

ΔH = bonds broken - bonds made

Question 6

what type of reaction does the reaction profile diagram represent

Answer 6

exothermic reaction

Question 7

what is energy absorbed and released like in an exothermic reaction

Answer 7

energy absorbed < energy released

Question 8

what is energy absorbed and released like in an endothermic reaction

Answer 8

energy absorbed > energy released

Question 9

what is the energy needed to break the bonds called

Answer 9

activation energy