SACE Stage 2 Chemistry case studies
SACE Stage 2 Chemistry · Put your knowledge to work in context.
SACE Stage 2 Chemistry is the final-year chemistry subject within the South Australian Certificate of Education, the senior secondary qualification awarded in South Australia and delivered through related programs elsewhere. It is typically taken by students in their final year of schooling who need a physical science for tertiary entry, or who want a rigorous grounding in chemical reasoning before further study. The SACE Stage 2 Chemistry case studies are 5 cases and about 3,858 words.
1Is the Adit the Only Source? Iron and Acidity in Clearwater Creek
A disused copper mine discharges water from an adit into Clearwater Creek, which flows at 0.35 m³/s. Sampling sites: A is 200 m upstream of the adit, B is 500 m downstream.
755 words, about 4 min2Ammonia Plant: Temperature, Purge and the Pressure Upgrade
An ammonia plant runs N2(g) + 3H2(g) ⇌ 2NH3(g), ΔH = -92 kJ/mol, at 450 °C and 200 atm over a promoted iron catalyst. Equilibrium conversion of N2 at 200 atm is 26% at 450 °C, 40% at 400 °C and 55% at 350 °C; at 250 atm and 450 °C it is 33%.
861 words, about 4 min3Batch 17: Acid Value, Water and Winter Blending
A farmers' cooperative makes biodiesel from used cooking oil by transesterification with methanol and NaOH catalyst. Deliveries vary in quality, so each batch is checked before reaction.
758 words, about 4 min40.4% Copper: Smelt or Leach?
A copper deposit averages 0.40% Cu, mostly chalcopyrite. Two development options are on the table.
721 words, about 4 min5A Six ppb Drift at the Roadside NO2 Station
A roadside air-quality station measures NO2 by chemiluminescence and logs 1-hour averages in ppb. On a winter morning the analyser recorded 118, 96 and 84 ppb in three consecutive hours; the 24-hour average was 46 ppb.
763 words, about 4 min