Bond Energies Flashcards
1
Q
What must always be supplied to break bonds?
A
Energy
2
Q
What happens to bonds during a chemical reaction?
A
Old bonds are broken and new bonds are formed
3
Q
What type of reaction is it when the bonds break?
A
Endothermic because energy is supplied to break the bonds
4
Q
What type of reaction is it when the bonds are formed?
A
Exothermic because energy is released
5
Q
What are the three stages of working out the overall energy change in bond energies?
A
- Find the energy required to break the origanal bonds
- Find the energy released by forming the new bonds.
- Find the overall energy change
6
Q
What equation do you use to work out the overall energy change?
A
overall energy change = energy required to break bonds - energy released by forming bonds
