Practice exam 3 · 30 pages · 120 marks · 15 minutes reading, 2 hours 30 minutes writing

Chemistry – Practice exam 3

Hydrogen home fuel, a magnesium–seawater battery, cobalt chloride equilibrium, aluminium smelting, isomeric butanols, a chloroalkane's spectra, ibuprofen and caffeine by HPLC.

Marks by area of study

Unit 3 AOS 1: 31 marksUnit 3 AOS 2: 26 marksUnit 4 AOS 1: 19 marksUnit 4 AOS 2: 33 marksSustainability: 6 marksKey science skills: 6 marks

Section B: short-answer and extended-response questions (90 marks)

Q	Context	Marks
1	A Victorian town is trialling the replacement of natural gas (methane) with hydrogen in its gas network for he	12
2	Ocean buoys that measure water temperature are powered by magnesium–seawater batteries	11
3	Hydrated cobalt(II) ions (pink) and chloride ions form tetrachlorocobaltate(II) ions (blue)	11
4	Aluminium is produced by the electrolysis of aluminium oxide dissolved in molten cryolite at about 960 °C	12
5	A student has three unlabelled bottles, X, Y and Z, each containing one of butan-1-ol, butan-2-ol and 2-methyl	11
6	A haloalkane with molecular formula C3H7Cl is known to be either 1-chloropropane or 2-chloropropane	11
7	Ibuprofen is a widely used pain reliever	10
8	Food standards in Australia limit the caffeine content of energy drinks to 320 mg L−1	12

Section A: what each question tests (30 marks)

Q	Key knowledge	Area of study
1	production of biodiesel by transesterification	Unit 3 AOS 1
2	thermochemical equations: ΔH consistent with coefficients	Unit 3 AOS 1
3	volume–volume stoichiometry of gases	Unit 3 AOS 1
4	energy efficiency and mass of fuel	Unit 3 AOS 1
5	energy content of food groups	Unit 3 AOS 1
6	oxidants, reductants and conjugate redox pairs	Unit 3 AOS 1
7	half-equations in basic conditions	Unit 3 AOS 1
8	galvanic cells with inert electrodes	Unit 3 AOS 1
9	ordering reductant strength from experimental data	Unit 3 AOS 1
10	fuel cell electrolytes	Unit 3 AOS 1
11	renewable energy sources and feedstocks	Unit 3 AOS 1
12	calculating average rates of reaction	Unit 3 AOS 2
13	catalysts and Maxwell–Boltzmann distributions	Unit 3 AOS 2
14	calculating Kc from equilibrium concentrations	Unit 3 AOS 2
15	Le Châtelier: removing a product	Unit 3 AOS 2
16	electrolysis of aqueous solutions with inert electrodes	Unit 3 AOS 2
17	requirements for rechargeable cells	Unit 3 AOS 2
18	writing testable hypotheses	Units 3–4 Key science skills
19	percentage uncertainty	Units 3–4 Key science skills
20	naming ketones	Unit 4 AOS 1
21	functional group isomers	Unit 4 AOS 1
22	types of organic reaction	Unit 4 AOS 1
23	atom economy and feedstocks	Unit 4 AOS 1
24	heating under reflux in organic synthesis	Unit 4 AOS 1
25	acid–base titration stoichiometry	Unit 4 AOS 2
26	the fingerprint region	Unit 4 AOS 2
27	¹H NMR: hydrogen environments	Unit 4 AOS 2
28	features of mass spectra	Unit 4 AOS 2
29	levels of protein structure	Unit 4 AOS 2
30	competitive inhibition	Unit 4 AOS 2