HCI Prelim P4 Preparation Instructions

2018 HCI C2 H2 Chemistry Preliminary Exam Paper 4 Preparation Instructions Safety Supervisors are advised to remind candidates that all substances in the examination should be treated with caution. Only those tests described in the Question Paper should be attempted. Attention is drawn in particular, to certain mate rials used in the examination. The following codes are used where relevant. • Explosives • Self-Reactives • Organic peroxides • Acute Toxicity (severe) • Flammables • Self Reactives • Pyrophorics • Self-Heating • Emit Flammable Gas • Organic Peroxides • Irritant • Dermal Sensitizer • Acute toxicity (harmful) • Narcotic Effects • Respiratory Tract Irritation • Oxidisers • Carcinogen • Respiratory Sensitizer • Reproductive Toxicity • Target Organ Toxicity • Mutagenicity • Aspiration Toxicity • Gases Under Pressure • Environmental Toxicity • Corrosives 'Hazard Data Sheets', relating to materials used in this examination, should be available from your chemical supplier. Before the Examination 1 Preparation of materials Where quantities are specified for each candidate, they are sufficient for the experiments described in the Question Paper to be completed. In preparing materials, the bulk quantity for each substance should be increased by 25% as spare material should be available to cover accidental loss. More material may be supplied if requested by candidates, without penalty. All solutions should be bulked and mixed thoroughly before use to ensure uniformity. 2 Labelling of materials Materials must be labelled as specified in these instructions. Materials with an FA code number should be so labelled without the identities being included on the label. Where appropriate the identity of an FA coded chemical is given in the Question Paper itself. 3 Identity of materials It should be noted that descriptions of solutions given in the Question Paper may not correspond exactly with the specifications in these Instructions. The candidates must assume the descriptions given in the Question Paper.

You should have the following apparatus and chemicals. Apparatus 1 × 250 cm3 graduated flask; 2 × 50 cm3 burettes; 2 × stands and clamps to hold the burettes; 2 × funnels; 1 × white tile; 1 × 25 cm3 pipette; 1 × pipette filler (or equivalent safety device); 1 × 250 cm3 conical flask; 2 × 10 cm3 measuring cylinders; 1 × 25 cm3 measuring cylinder; 1 × 50 cm3 measuring cylinder; 1 × permanent marker pen suitable for writing on glass; 1 × wash bottle containing deionised water; 1 × thermometer with range –5 oC to +100 oC, graduated to 0.5 C; 7 × test-tubes; 1 × test-tube rack; 2 × boiling tubes; 1 × Bunsen burner; 1 × 250 cm3 beaker; 1 × test-tube holder; 1 × delivery tube; 1 × pair of disposable vinyl gloves; 1 × pair of safety goggles; Access to deionised water; Access to a weighing balance; A clear plastic bag containing: 5 × dropping pipettes; 1 × weighing bottle; 2 × Styrofoam cups; 1 × plastic lid; 1 × spatula; 1 × wooden splint; 3 × litmus papers; 2 × filter papers. Chemicals In clear plastic bag Collect from Teacher’s bench Beside weighing balance Bench reagents FA 1 FA 2 FA 3 FA 4 FA 7 FA 8 FA 9 FA 10 Starch solution FA 6 aqueous ammonia aqueous sodium hydroxide limewater aqueous potassium manganate(VII) aqueous bromine

FA reagents (1 set for every candidate) hazard label per candidate identity notes FA 1 90 cm3 0.0700 mol dm –3 potassium iodate(V) FA 2 120 cm3 1.0 mol dm –3 sulfuric acid, H2SO4 FA 3 80 cm3 0.50 mol dm –3 potassium iodide FA 4 100 cm3 0.1 mol dm –3 sodium thiosulfate Starch solution 10 cm3 20 g dm –3 FA 6 6 g Mixture of equal mass of potassium iodide and lithium chloride stored in a dry, red capped bottle labelled FA 6 (Please cap after each shift), for students to weigh themselves (with big metal spatula) Fresh for each shift FA 7 6 g MnO 2 FA 8 1 g Sodium ethanedioate FA 9 10 cm3 0.5 mol dm –3 manganese(II) sulfate FA 10 0.5 cm3 Cyclohexene Bench reagents (1 set per seat for 3 shifts) hazard label per candidate identity aqueous ammonia 10 cm3 per shift 2 mol dm–3 aqueous sodium hydroxide 10 cm3 per shift 2 mol dm–3 Limewater 10 cm3 per shift Aqueous potassium manganate (VII) 10 cm3 per shift 0.02 mol dm–3 Bromine water 5 cm3 per shift