![]() An increase in the number of particles per unit volume (concentration) increases the chance of their colliding. Concentration – For a chemical reaction to occur, the particles must collide.The energy required to give molecules enough kinetic energy to form an activated complex is known as the activation energy for the reaction. When such a change occurs, an activated complex is formed, which allows the reaction to proceed. For these molecules to react, they must collide with enough kinetic energy to cause changes in the electron clouds of both molecules. Ionic reactions are almost instantaneous because of the strong attraction between the charged particles.īecause of electron cloud repulsion, most neutral molecules that come in contact with one another bounce off without reacting.Reactions with bond rearrangement or electron transfer generally take longer than ionic reactions. ![]() ![]() The nature of the reactants involved in a chemical reaction will determine the kind of bonding that occurs. The study of reaction rates is the study of the forming and breaking of chemical bonds. Different chemical reactions take place at different rates. The units of reaction rate are (moles / dm 3) / second.
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