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
From the blog
Understanding the ideal gas equation
The ideal gas equation is an amalgamation of Boyle’s law, Charles’s law and Avogadro’s law and it describes the behaviour
Finding the formula of a hydrocarbon from gas volumes
This leads on directly from the previous position molar volume . The video works through a problem to find the
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How to find the volume of gas in a reaction
Avogadro’s law is the basis for calculating the volume of gas produced in a reaction: equal volumes of gases at
Determining an empirical formula using combustion analysis
Combustion analysis is a simple technique used to find the empirical formula of a compound – often an organic or
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Finding the formula of a hydrated salt
Finding the formula of a hydrated salt is no different than determining the empirical formula of any other compound –
Determining the limiting reactant in a reaction
Limiting reactant problems follow on directly from reacting mass calculations. In these questions, you have to figure out which reactant
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Percentage yield calculations
Percentage yield is one of many deciding factors in determining whether or not a reaction is economically viable. It compares
Reacting mass calculations
The key to reacting mass calculations at A level is to have a foolproof method for setting them out so
Empirical vs. molecular formulae
Empirical formula: simplest ratio of the atoms of different elements in a compound Molecular formula: the actual number of each
Working with different units in chemistry
Factor Name Unit Common examples 106 mega M 103 kilo k kg 10-1 deci d dm 10-2 centi c cm