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covalent bonds are much stronger than hydrogen bonds covalent bonds have bond energies from about 155 to 1000 kj mol hydrogen bonds usually have bond energies from 20 to 30 kj mol even though some hydrogen fluorine hydrogen bonds can have bond energies greater than 155 kj mol
But, only molecules which have polar covalent bonds can do this, non polar covalent bonds cannot form a hydrogen bond. A hydrogen bond is one kind of weak bonds. Other forms of weak bonds are ionic bonds and van der Waals interaction. Weak bonds are attractions which forms easily and quickly and do not a need large amount of energy to break because they are easily broken under natural biological conditions.