Calculations for AS and A level Chemistry
Being confident in tackling different types of mole calculation is the foundation upon which much of A level chemistry stands
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Using the Arrhenius equation to find the activation energy for a reaction
For almost all reactions there is an energy barrier to overcome – this is known as the activation energy, Ea,
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Differential and integrated rate equations for first order reactions
The decomposition of dinitrogen pentoxide is a first order reaction . 2N2O5(g) ⇾ 4NO2(g) + O2(g) The rate of the
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Half life and first order reactions
All first order reactions have a constant half life, t½, which means that the time taken for the concentration of
Rearranging equations to give straight line graphs in Chemistry
Graphs are one of the best ways we have to determine the quantitative relationship between an observed (plotted on the
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Understanding logarithms and natural logarithms in chemistry
A logarithm is simply the number of times we need to multiply one number together to make another number i.e.
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Understanding indices and powers
Numbers expressed as an index or power of a base number are common in chemistry and you need to be
What is a clock reaction?
A clock reaction can be used to measure the rate of reaction in certain circumstances. In a typical reaction the
Using colorimetry to follow the rate of a reaction
We can use a colorimeter to follow the rate of a reaction if one of the reactants or products is
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Determining orders of reaction and a rate equation from experimental data
In order to write a rate equation (rate law) for a reaction we need to know the orders of reaction
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Understanding the rate law and orders of reaction
The reaction between hydroxide ions and bromoethane involves a collision between a molecule of each of the reactants, which means
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