AQA A Level Chemistry复习笔记1.7.5 Effect of Concentration & Pressure

Category: A-level课程, 教材笔记, 福利干货 Date: 2022年6月30日下午12:42

Concentration, Pressure & Rate of Reaction

Concentration

The more concentrated a solution is, the greater the number of particles in a given volume of solvent
An increase in concentration causes in an increased collision frequency and therefore an increased rate of reaction

The diagram shows a higher concentration of particles in (b) which means that there are more particles present in the same volume than (a) so the chances and frequency of collisions between reacting particles is increased causing an increased rate of reaction

Pressure

An increase in pressure in reactions that involve gases has the same effect as an increase in the concentrations of solutions
When the pressure is increased, the molecules have less space in which they can move
This means that the number of effective collisions increases due to an increased collision frequency
An increase in pressure therefore increases the rate of reaction

The diagram shows a higher pressure in (b) which means that the same number of particles occupy a smaller volume, resulting in an increased collision frequency and therefore increased rate of reaction

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