You are watching: Ionic bond stronger than covalent bond
I simply completed AP chemistry in high school, and also in chemistry the is taught that ionic bonds are strongest. However, my AP bio friends informed me that in biology, covalent bonds are strongest. Can someone define why the 2 classes teach this differently?
Covalent bonding is leading in necessary chemistry, but ionic bonds generally have higher dissociation energies. I'm not sure why her friends have actually been led to think that covalent bonds space stronger, together that's normally not true. Certainly more common in biology, but being more common clearly doesn't typical that they're stronger.
Interestingly, the phenomena which cause covalent and also ionic bond to form are not mutually exclusive, for this reason actual chemistry bonds derive their toughness from both forces simultaneously. When we speak to something a covalent bond, it method that covalence is the major reason for the bonding, not that the bond has actually no ionic character.
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As a chemist i am going to say the means this is taught in biologic is type of right and the means it is teach in chemistry is confusing. Ionic bonds room stronger. The takes an ext energy to traction the 2 atoms apart to infinity than it does in a covalent bond. But, that is an energy measured in a vacuum. In the presence of solvent, such as water, this transforms drastically. This is since the two atoms in one ionic bond (as various other commentators mentioned, there is no such thing as a completely ionic or covalent bond, that is just what we call the extremes of various ends of a continuum) once separated do ions. This ions room massively stabalized through the water molecules through non-covalent interactions. What this method in physical terms is that when you break a bond, you no only need to look at the stability of the bond, but also the security of the products. As soon as the commodities are very stable, over there is a smaller power difference in between the the bond and the atoms. So, that is really difficult to break a NaCl link in a vaccuum. That is an extremely easy to do it in water. Therefore in biological contexts, constantly in water, ionic binding are much more suggestions 보다 bonds-a convenient way of relenten ion pairs, and are hence much lot weaker 보다 a covalent bond the doesn't dissociate in the same way. However in a vacuum, the ionic link is much harder to break 보다 a an easy covalent interaction.