C2.4 Rates of reaction

Question	Answer
Two equations for the rate of a chemical reaction	1) Rate= Quantity of reactant used up/time 2) Rate= Quantity of product formed/time
3 experimental ways of measuring the rate of a reaction	1. Measure the loss in mass of reactants over time using a mass balance 2. Measure the volume of gas produced over time using a gas syringe 3. Measure the time taken for a solution to become opaque
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The collision theory states a chemical reaction can only occur if...	1. Reacting particles collide 2. Reacting particles collide with sufficient energy
5 factors that affect the rate of a chemical reaction	1. Temperature 2. Concentration 3. Pressure 4. Surface area 5. Catalyst
Increase in temp	Increasing the temperature increases the speed of the reacting particles so they collide more frequently and more energetically. This increases the rate of reaction.
Increase in pressure	More particles in a given volume Increases the frequency of collisions so increases the rate of reaction
Increase in concentration	More particles in a given volume Increases the frequency of collision so increases the rate of reaction
Increase in surface area	Increases the frequency of collisions so increases the rate of reaction

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	Created by tanya-williams46 almost 9 years ago