Rate of decomposition of H 2 O 2 = − change in concentration of reactant time interval = − t 2 − t 1 t 2 − t 1 = − Δ Δ t rate of decomposition of H 2 O 2 = − change in concentration of reactant time interval = − t 2 − t 1 t 2 − t 1 = − Δ Δ t For example, the concentration of hydrogen peroxide, H 2O 2, in an aqueous solution changes slowly over time as it decomposes according to the equation: For reactions involving aqueous electrolytes, rates may be measured via changes in a solution’s conductivity.įor reactants and products in solution, their relative amounts (concentrations) are conveniently used for purposes of expressing reaction rates. For reactions involving one or more colored substances, rates may be monitored via measurements of light absorption. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. The rate of reaction is the change in the amount of a reactant or product per unit time. Likewise, the rate of a chemical reaction is a measure of how much reactant is consumed, or how much product is produced, by the reaction in a given amount of time. Wage is a rate that represents the amount of money earned by a person working for a given amount of time. Speed is a familiar rate that expresses the distance traveled by an object in a given amount of time.
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