Practice exam 5 · 30 pages · 120 marks · 15 minutes reading, 2 hours 30 minutes writing

Chemistry – Practice exam 5

Coal and gas power stations, circuit-board etching, the iron(III) thiocyanate equilibrium, lead–acid batteries, butanone from but-2-ene, identifying an amide, insulin and the combustion of alcohols.

Marks by area of study

Unit 3 AOS 1: 41 marksUnit 3 AOS 2: 24 marksUnit 4 AOS 1: 19 marksUnit 4 AOS 2: 25 marksSustainability: 4 marksKey science skills: 7 marks

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

Q	Context	Marks
1	Electricity in Victoria has been generated mainly by burning brown and black coal, with gas-fired stations use	12
2	Iron(III) chloride solution is used to etch (dissolve) unwanted copper from printed circuit boards	11
3	Iron(III) ions react with thiocyanate ions to form the deep-red complex ion FeSCN2+.	11
4	A car battery is made of six lead–acid cells	11
5	Butanone is an industrial solvent	12
6	Compound Y has the molecular formula C3H7NO	11
7	Insulin is a small protein hormone that regulates blood glucose	10
8	Students compared the energy released by burning four alcohols	12

Section A: what each question tests (30 marks)

Q	Key knowledge	Area of study
1	properties of biodiesel and petrodiesel	Unit 3 AOS 1
2	energy per gram and per litre	Unit 3 AOS 1
3	the universal gas equation	Unit 3 AOS 1
4	enthalpy of vaporisation of water	Unit 3 AOS 1
5	photosynthesis and respiration	Unit 3 AOS 1
6	identifying oxidants using oxidation numbers	Unit 3 AOS 1
7	predicting reactions from the electrochemical series	Unit 3 AOS 1
8	predicting reactions involving ions with more than one oxidation state	Unit 3 AOS 1
9	fuel cell half-equations in acidic electrolyte	Unit 3 AOS 1
10	energy profiles: forward and reverse activation energies	Unit 3 AOS 2
11	extent of reaction v rate	Unit 3 AOS 2
12	reaction quotient after a concentration change	Unit 3 AOS 2
13	rate and yield	Unit 3 AOS 2
14	comparing electrolytic and galvanic cells	Unit 3 AOS 2
15	factors limiting the life of rechargeable cells	Unit 3 AOS 2
16	Faraday’s laws: volume of gas	Unit 3 AOS 2
17	significant figures in calculated results	Units 3–4 Key science skills
18	validity and controlled variables	Units 3–4 Key science skills
19	naming branched alkenes	Unit 4 AOS 1
20	structural isomers of haloalkanes	Unit 4 AOS 1
21	viscosity of alkanes	Unit 4 AOS 1
22	esterification: identifying reactants	Unit 4 AOS 1
23	atom economy v percentage yield	Unit 4 AOS 1
24	naming carboxylic acids	Unit 4 AOS 1
25	distinguishing carboxylic acids and esters	Unit 4 AOS 2
26	redox titration stoichiometry	Unit 4 AOS 2
27	systematic errors in titration technique	Unit 4 AOS 2
28	IR identification of esters	Unit 4 AOS 2
29	condensation of amino acids	Unit 4 AOS 2
30	enzyme specificity	Unit 4 AOS 2