Rate as change per unit time
Rate as change per unit time
The rate of reaction is the change in concentration of a reactant or product per unit time. If concentration is measured in mol dm−3\text{mol} \, \text{dm}^{-3}moldm−3 and time in s, rate is usually quoted in mol dm−3 s−1\text{mol} \, \text{dm}^{-3} \, \text{s}^{-1}moldm−3s−1.
Step-by-step lessons on OCR A A Level Chemistry How fast?. Each one builds up to exam-style questions. Build confidence with atomic structure, bonding and moles calculations early on, since these underpin the more demanding organic mechanisms, equilibrium and practical-analysis topics that dominate Year 2.