Rates Of Reactions

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  • Created by: J355 G
  • Created on: 14-11-17 18:28

Using A Catalyst

A catalyst is a substance that speeds up a reaction with out being used up its self so it is not included in the equation.

Different catalysts are needed for differnet reactions but they all work by decreasing the acivation energy need for the reaction to occur. They do this by providing an alternate pathway with a lower activation energy.

Enzymes are biological catalysts

Calculations From Results

The rate of the reaction can be observed either by how quickly the reactants are used up or how quickly the products are formed.

Rate of Reaction = Amount of reactants used up / time

or

Rate of Reactio = Amount of product formed / time

The amount of product can also be measured in moles.

Precipitation And Colour Change

- You can record the visual change in a recation if the intial solution is transparent and the product is a precipitate which clouds a solution

- You can observe a mark through the solution and measure how long it takes for it to disapear. 

- If the reactants are coloured and the products are colourless (or vice versa) you can time how long it takes for the solution to lose or gain its colour

- The results are very subjective. Different people might not agree over the exact point…

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