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The Free Dictionary describes a complexation reaction as a chemical reaction between a ligand and a metal ion. A ligand is an ionic entity with at least one atom that contains an unshared pair of electrons. Keep Learning.
You have to have enough energy to overcome the activation energy barrier (that is to start breaking some bonds). For an energy-absorbing reaction, the activation energy must be at least as big as the energy absorbed (and usually much bigger). For an energy-releasing reaction, it could be as small as zero.Enzymes are, by definition, proteins.I assume you want to know why they are good as catalysts. Among other factors, the complex 3-D shape of a protein makes it possible to physically hold reactants in close proximity to each other. just now. Report Abuse. Proteins are very highly structurally complex, which means within their structure are highly specific 'pockets' which act as active sites for reaction catalysis. These sites can be acidic, basic, hydrophilic, hydrophobic, all depending on the nature of the amino acids inside the pocket.