Cameroon GCE A-Level Chemistry case studies
Cameroon GCE A-Level Chemistry · Put your knowledge to work in context.
The Cameroon GCE Advanced Level Chemistry is the two-year post-Ordinary Level qualification examined by the Cameroon General Certificate of Education Board, normally taken by students in the Upper Sixth (Terminale) as the school-leaving and university-entrance credential for science pathways. It is used for admission to faculties of science, medicine, pharmacy, engineering and agriculture, and for teacher-training and laboratory-technician routes, so a strong grade matters beyond simple certification. The Cameroon GCE A-Level Chemistry case studies are 5 cases and about 3,287 words.
1Spirit-burner calorimetry: why the fuel value falls short
In a school laboratory, a student burns propan-1-ol (Mr = 60.0) in a spirit burner beneath a copper can. The can contains 200 g of water and has a mass of 85 g; the specific heat capacities are 4.18 J g⁻¹ K⁻¹ for water and 0.385 J g⁻¹ K⁻¹ for copper.
554 words, about 3 min2Dinitrogen tetroxide equilibrium under compression
At 350 K, 0.200 mol of dinitrogen tetroxide is sealed in a 2.00 dm³ flask and allowed to reach equilibrium: N2O4(g) ⇌ 2NO2(g). Analysis shows that 0.060 mol of N2O4 remains.
592 words, about 3 min3Identifying an ester from hydrolysis tests
A colourless liquid A has the molecular formula C4H8O2 and a pleasant smell. It does not react with sodium carbonate solution and gives no colour with bromine water in the dark.
684 words, about 3 min4Preparing and testing a phosphate buffer for an enzyme assay
A technician must prepare 250.0 cm³ of a phosphate buffer of pH 7.40 for an enzyme assay. Stock solutions are 0.100 mol dm⁻³ sodium dihydrogen phosphate, NaH2PO4, and 0.100 mol dm⁻³ disodium hydrogen phosphate, Na2HPO4.
695 words, about 3 min5Colorimetric iron determination in fortified cereal
To determine the iron content of a fortified breakfast cereal, a student grinds 20.0 g of cereal, digests it in acid, and makes the solution up to 100.0 cm³. A 10.0 cm³ aliquot is treated with excess potassium thiocyanate and made up to 50.0 cm³; the red complex absorbs at 480 nm.
762 words, about 4 min