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Solving a system of three linear equations in 3 unknowns using Gaussian Elimination (or Gauss-Jordan algorithm) in 5 stages. Solutions are all integers. Introductory question where the numbers come out quite nice with not much dividing. Set-up is meant for formative assessment. Adapated from a question copied from Newcastle.

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Calculate the concentration of a dilute acid given the amount and concentration of dilute alkali to neutralise it. Cribbed from this Bitesize problem.

There are steps to break down the calculation, and the student must give units at each step.

Preparing solutions to given concentrations/dilutions.

Instructions to candidates:-

a)        questions are to be attempted

b)       Answer questions in the spaces provided 

d)       Approved calculators are allowed

e)        Marks for each question are shown

f)       The total mark for the paper is 100.

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