Reaction Rate Defined
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A reaction rate is a reactant's or product's concentration change divided by elapsed time, reported as a positive quantity.
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Dissolved hydrogen peroxide loses concentration over hours as it decomposes; dividing that loss by the elapsed time gives its rate.
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A reactant's concentration falls as a reaction runs, so its change is negative — the rate flips that sign to stay positive.
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- 1604 Relative Reaction Rates from Stoichiometry
- 1610 Average, Instantaneous, and Initial Rate
- 1615 Reactant Identity and Reaction Rate
- 1632 The Rate Law and Reaction Order
- 1741 Dynamic Equilibrium: Equal Rates, Not Equal Concentrations
- 1746 Equilibrium as a Consequence of Kinetics
- 2061 Spontaneous Process Defined
- 2063 Twin: Spontaneous Does Not Mean Fast