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Non-commutative substances in chemistry are elements or compounds that do not follow the commutative property. This means that the order in which they interact or combine can affect the outcome of a reaction. An example of a non-commutative substance is hydrogen peroxide (H2O2), which can react differently depending on the order of reagents added.
Chemical reactions have several different energy levels. They have an energy level for the products, the reactants, and an intermediate. The difference in energy between the intermediate and the ractants is called the activation energy. Enzymes reduce the activation energy of reactions and therefore allow reactions to occur within the human body. Reactions require three things: collision, collision with sufficient energy, and collision in the correct orientation. Enzymes increase the collision probability by holding the reactants in place. They also decrease the activation energy. Enzymes also orient the reactants in the correct orientation because of its specific binding sites.