| Front | Double covalent bond |
| Back | two electrons from each bonding atomoriginal orbitals are half filled |
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| Front | Single covalent bonds |
| Back | one electron from each bonding atom is usedoriginal orbitals are half filled |
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| Front | define enthalpy |
| Back | the amount of energy involved with a chemical transformationbond enthalpy is the average energy of a covalent bond, found by breaking this type of bond |
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