Measuring Rates of Reaction (AQA A-Level Chemistry): Flashcards

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Measuring Rates of Reaction
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Rate of reaction

Change in concentration per unit time

Rate of reaction formula

change in concentrationtime\frac{\text{change in concentration}}{\text{time}}

Rate of reaction units

mol dm−3 s−1\text{mol} \, \text{dm}^{-3} \, \text{s}^{-1}

Collision theory

Particles collide with sufficient energy & correct orientation

Concentration effect on rate

Increases rate - more particles, more collisions

Temperature effect on rate

Increases rate - more kinetic energy, more successful collisions

Pressure effect on rate (gases)

Increases rate - particles closer, more collisions

Surface area effect on rate

Increases rate - more particles exposed to collisions

How catalysts increase rate

Provides alternative pathway with lower activation energy

Measuring rate with gas

Gas syringe measures volume at time intervals

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