Bond Energies Flashcards
(7 cards)
1
Q
what kind of process is bond breaking and why?
A
endothermic: energy must be supplied to make existing bonds
2
Q
what kind of process is bond formation and why?
A
exothermic: energy is released when new bonds are formed
3
Q
in endothermic reactions, the energy used to break bonds is…
A
greater than the energy released by forming them
4
Q
in exothermic reactions, the energy released by forming bonds is…
A
greater than the energy used to break them
5
Q
equation to work out bond energy
A
enthalpy change (ΔH) = total energy absorbed to break bonds - total energy released in making bonds
6
Q
endothermic reaction has a _______ energy change
A
positive
7
Q
exothermic reaction has a _______ energy change
A
negative
