GTLE Subject Specialism Chemistry case studies
GTLE Subject Specialism Chemistry · Put your knowledge to work in context.
The GTLE Subject Specialism Chemistry paper is the chemistry-specific component of Ghana's teacher licensure examination route for candidates who intend to teach chemistry in basic or secondary schools. It is aimed at graduate and trainee teachers whose degree includes chemistry or a closely related science, and it tests whether they can handle the subject at the depth required to teach it confidently and accurately, not merely whether they can recall a syllabus. The GTLE Subject Specialism Chemistry case studies are 5 cases and about 4,640 words.
1Back-titration of a Mixed Carbonate Antacid Tablet
An analyst at a contract laboratory receives a batch of antacid tablets labelled 'calcium carbonate 250 mg and magnesium carbonate 250 mg per tablet'. One tablet weighs 0.6500 g.
943 words, about 5 min2Pilot-Plant Methanol Reactor: Rate Versus Equilibrium
On a summer placement at a methanol pilot plant, an engineering student is asked to review a proposal to raise the reactor temperature from 520 K to 560 K. The reaction is CO(g) + 2 H₂(g) ⇌ CH₃OH(g), ΔH° = −91 kJ mol⁻¹.
970 words, about 5 min3Preparing a Phosphate Buffer for an Enzyme Assay
An undergraduate preparing an enzyme kinetics practical is asked to make 500.0 cm³ of 0.100 mol dm⁻³ sodium phosphate buffer at pH 7.40. The stock cupboard contains solid NaH₂PO₄·2H₂O (M = 156.01 g mol⁻¹) and Na₂HPO₄·12H₂O (M = 358.14 g mol⁻¹), together with 1.000 mol dm⁻³ HCl and NaOH.
853 words, about 4 min4Silver Plating Brass Handles: Faraday Law and Anode Choice
A small heritage-metal workshop has an order for 40 brass spoon handles, each with a total surface area of 35 cm², to be silver-plated to a nominal thickness of 12 µm. The workshop uses a cyanide-free silver bath, a 0.80 A current per item, and a quoted cathode efficiency of 94%.
930 words, about 5 min5Rate Data and Mechanism for Two Halogenoalkane Hydrolyses
A student investigates the hydrolysis of two halogenoalkanes in aqueous ethanol at 40.0°C by following the release of bromide ions with silver nitrate. The substrates are 1-bromobutane and 2-bromo-2-methylpropane.
944 words, about 5 min