Rates of Reaction

Chemistry

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Reactions

The rate of a chemical reaction is found by measuring the amount of a reactant used or the amount of a product formed in a unit of time.

Chemical reactions only happen when particles collide with enough energy to react. The minimum energy they need to react is called the "activation energy".

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Increasing Temperature, concentration, pressure an

Increasing the temperature, concentration of solutions, pressure of gasses, or the surface area of solid reactants causes particles to collide more frequently.

Increasing the temperature of reactants causes the particles to collide more often with more energy.

Increasing the concentration of reactants, pressure of gasses, or the surface area of solid reactants causes particles to collide more frequently.

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Cont.

Concentrations of solutions measured in moles per dm3 enable you to compare the number of particles of the substances dissolved in the solution.

Equal volumes of gasses at the same temperature and pressure contain the same number of molecules (and the same  number of moles)

Catalysts change the rate of particular reactions and are more important in speeding up industrial processes.

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