Practice exam 1 · 30 pages · 120 marks · 15 minutes reading, 2 hours 30 minutes writing

Chemistry – Practice exam 1

Biogas, cells, the contact process, copper refining, flavour esters, a forensic solvent, aspartame and vinegar.

Marks by area of study

Unit 3 AOS 1: 37 marksUnit 3 AOS 2: 26 marksUnit 4 AOS 1: 17 marksUnit 4 AOS 2: 28 marksSustainability: 3 marksKey science skills: 10 marks

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

Q	Context	Marks
1	A dairy farm in Gippsland feeds cow manure into an anaerobic digester	15
2	Students investigated galvanic cells made by connecting a nickel half-cell (a nickel electrode in 1.0 M Ni(NO3	10
3	Sulfur trioxide is made industrially in the contact process by reacting sulfur dioxide with oxygen over a vana	11
4	Copper is purified by electrolysis	9
5	Methyl butanoate has an apple-like odour and is used as a food flavouring	11
6	A liquid found at a crime scene is thought to be a solvent with molecular formula C5H10O	12
7	Aspartame is an artificial sweetener about 200 times sweeter than sucrose	9
8	A brand of white vinegar is labelled ‘ethanoic acid 4.0% w/v’ (4.0 g per 100 mL)	13

Section A: what each question tests (30 marks)

Q	Key knowledge	Area of study
1	fossil fuels and biofuels: origin and renewability	Unit 3 AOS 1
2	energy content of carbohydrates, proteins and fats	Unit 3 AOS 1
3	balanced equations for incomplete combustion of ethanol	Unit 3 AOS 1
4	electrical calibration of a solution calorimeter	Unit 3 AOS 1
5	calorimetry: enthalpy of solution from calibration factor	Unit 3 AOS 1
6	oxidation numbers; oxidation and reduction	Unit 3 AOS 1
7	galvanic cells: electrodes, electron and ion flow	Unit 3 AOS 1
8	predicting spontaneous redox reactions from the electrochemical series	Unit 3 AOS 1
9	comparison of fuel cells and galvanic cells	Unit 3 AOS 1
10	fuel cell half-equations in alkaline conditions	Unit 3 AOS 1
11	mass–volume stoichiometry of combustion at SLC	Unit 3 AOS 1
12	primary cells: half-equations in alkaline conditions	Unit 3 AOS 1
13	Maxwell–Boltzmann distributions and temperature	Unit 3 AOS 2
14	equilibrium constants for reversed and multiplied equations	Unit 3 AOS 2
15	interpreting concentration–time graphs; effect of volume change	Unit 3 AOS 2
16	predicting products of aqueous electrolysis	Unit 3 AOS 2
17	rechargeable cells: discharge and recharge	Unit 3 AOS 2
18	Faraday’s laws: mass deposited in electroplating	Unit 3 AOS 2
19	concordant titres and outliers in volumetric analysis	Units 3–4 Key science skills
20	systematic and random errors; accuracy and precision	Units 3–4 Key science skills
21	IUPAC naming of alcohols with alkyl substituents	Unit 4 AOS 1
22	atom economy of fermentation	Units 3–4 Cross-study
23	overall yield of a multistep synthesis	Unit 4 AOS 1
24	optical isomers: identifying chiral centres	Unit 4 AOS 1
25	separation of immiscible liquids in organic synthesis	Unit 4 AOS 2
26	qualitative tests for functional groups	Unit 4 AOS 2
27	IR absorptions of functional groups	Unit 4 AOS 2
28	¹H NMR splitting (n + 1 rule) and number of environments	Unit 4 AOS 2
29	formation of peptide bonds	Unit 4 AOS 2
30	enzymes: effect of temperature and denaturation	Unit 4 AOS 2