chemistry

rates of chemical reactions and the collision model Home > Rate of a Chemical Reaction - Chemical Kinetics > Rates of Chemical Reactions and the Collision Model   Rates of Chemical Reactions and the Collision Model   Reaction rates are affected both by reactant concentrations and by temperature . The collision model , that is based on the kinetic-molecular theory , explains for both of these effects at the molecular level. In general only a small number of reactant collisions leads to products (in certain cases 1 in 10 13 collisions). The basic principles of the collision model (collision theory) are as follows: Molecules must collide to react – Collisions are necessary to transfer kinetic energy, to break reactant chemical bonds and form product bonds The greater the number of collisions per second the greater the reaction rate – This agrees with the observation that as reactant concentration increases the rate of a reaction increas

Rate of a Chemical Reaction Home > Rate of a Chemical Reaction - Chemical Kinetics   Rate of a Chemical Reaction - Chemical Kinetics Chemical kinetics is the area of chemistry in which reaction rates are studied. Kinetics is largely an experimental science. Reaction rate is called the speed at which a chemical reaction occurs. Some chemical reactions are complete within a fraction of a second (explosions) while others take years (corrosion of metals) or even centuries (formation of mineral’s in Earth). The basic concepts covered in this post are the following: Factors that affect the rate of chemical reactions Definition of the rate of reaction   What are the factors that affect the rate of chemical reactions? Four factors allows us to change the rate at which a reaction occurs:   Physical state and nature of the reactants Reactants in the same physical state tend to react faster since there is a greater chance for collis