NCEA L3 Chemistry case studies
NCEA L3 Chemistry · Put your knowledge to work in context.
This page is an independent study resource for NCEA Level 3 Chemistry, a subject within the New Zealand National Certificate of Educational Achievement (NCEA) administered by the New Zealand Qualifications Authority (NZQA). It is written for secondary students in New Zealand preparing for Level 3 Chemistry, and for teachers, tutors, and home-schooled learners supporting them. NCEA Level 3 is the third year of the NCEA qualification and is typically studied in Year 13. We cannot state the number of questions, the exam duration, the passing score, the fee, the retake policy, or the validity period for NCEA Level 3 Chemistry, because the official NZQA pages retrieved for this profile returned "Sorry, we can't find that page" (a 404 page-not-found notice). The NCEA L3 Chemistry case studies are 5 cases and about 2,803 words.
1Methanol Plant: Positive ΔG° but Still Viable?
An industrial chemistry class is evaluating a proposed methanol plant. The core reaction is CO(g) + 2H2(g) ⇌ CH3OH(g).
594 words, about 3 min2Compostable Cutlery Contaminated with Nylon-6,6
A recycling plant receives bales of 'compostable' plastic cutlery. The supplier claims the cutlery is polylactic acid (PLA), a polyester made from lactic acid (2-hydroxypropanoic acid).
537 words, about 3 min3Ethanoate Buffer Under Fermentation Acid Load
A student prepares a buffer for a fermentation experiment by mixing 50.0 mL of 0.100 mol L−1 ethanoic acid (Ka = 1.74 × 10−5) with 50.0 mL of 0.100 mol L−1 sodium ethanoate. The pH meter reads 4.76.
563 words, about 3 min4Silver Electroplating: Efficiency or Silver Ion Depletion?
A technician electroplates steel teaspoons with silver using a silver anode and a silver nitrate electrolyte. The current is 0.500 A and the plating time is 30.0 min.
544 words, about 3 min5Two Isomers of C2H4O2: IR and NMR Evidence
A school laboratory has two unlabelled bottles, both labelled C2H4O2 (M = 60 g mol−1). One contains ethanoic acid (the acid in vinegar); the other contains methyl methanoate, a volatile ester.
565 words, about 3 min