Written Paper
Section I
Question 24 - 2002 HSC
Assess the impact of atomic absorption spectroscopy (AAS) on the scientific understanding of trace elements.
Written Paper
Section I
Question 25 - 2002 HSC
(a) Provide the systematic name of the CFC illustrated. (b) Identify the bonding within the ozone molecule, using a Lewis electron-dot diagram. (c) Discuss how CFCs damage the ozone layer, using relevant equations.
Written Paper
Section I
Question 26 - 2002 HSC
(a) Describe a test to determine whether a given sample of water is 'hard' or 'soft'. (b) Given the concentration of magnesium carbonate in a sample of hard water, calculate the mass, in mg, of magnesium carbonate in 150mL of this sample.
Written Paper
Section I
Question 27 - 2002 HSC
Describe the physical and chemical processes needed to purify and sanitise a town water supply.
Written Paper
Section I
Question 32 - 2002 HSC
(a) Identify the functional group in glycerol; compare reactions of glycerol and 1-propanol with cold dilute KMnO4. (b) Discuss the value of electron spectroscopy and scanning tunnelling microscopy in forensic chemistry analysis. (c) Identify the class of compounds used to break proteins into fragments of different lengths; describe the processes of electrophoresis and chromatography in separating organic compounds. (d) Outline the equipment and procedure used to analyse emission spectrum of sodium; explain how emission spectrum is produced. (e) Discuss uses of DNA analysis in forensic chemistry.
Written Paper
Section I
Question 28 - 2002 HSC
(a) Define saponification and account for the cleaning action of soap. (b) Calculate the equilibrium constant for a reaction used to form sulfuric acid. (c) Describe the reaction when sulfuric acid is added to water; using equations, describe the use of sulfuric acid as an oxidising agent, a dehydrating agent and as a means of precipitating sulfates. (d) Outline a procedure to investigate an equilibrium reaction; explain how the reaction can be analysed quantitively. (e) Evaluate changes in the industrial production methods for sodium hydroxide.
Written Paper
Section I
Question 29 - 2002 HSC
(a) Type of electrochemical cell producing a spontaneous reaction; voltage required to operate an illustrated cell as an electrolytic cell. (b) How the work of early scientists increased our understanding of electron transfer reactions. (c) Method for removing salt from a shipwreck artefact; chemical procedures used to clean and preserve artefacts. (d) Procedure for comparing the rate of corrosion in different acidic and neutral solutions; explain whether data supports a hypothesis that acidic environments accelerate the corrosion of shipwrecks. (e) Analyse the effect of ocean depth on corrosion of metallic objects.
Written Paper
Section I
Question 31 - 2002 HSC
(a) Identify the metal ion that produces a yellow colour in a flame test; explain how some metal ions produce a colour in a flame. (b) Describe the bonding in a coordination complex. (c) Explain the term reflectance spectrum; outline how infrared and ultraviolet light are used to determine the chemical composition of pigments. (d) State the electronic configuration of manganese in terms of subshells; outline the procedure used to determine oxidising strength of potassium permanganate; justify a conclusion about oxidising strength of potassium permanganate. (e) Analyse trends in the physical properties of the first transition series.
Written Paper
Section I
Question 16 - 2002 HSC
(a) Name alkene used in first-hand investigation to compare its reactivity with its corresponding alkane. (b) Outline the procedure used in the investigation. (c) Describe the results obtained and include relevant chemical equations.
Written Paper
Section I
Question 17 - 2002 HSC
Explain why alkanes and their corresponding alkenes have similar physical properties, but very different chemical properties.
Written Paper
Section I
Question 18 - 2002 HSC
(a) Name the type of polymerisation shown in the chemical equation. (b) Assess current developments in the use of biopolymers.
Written Paper
Section I
Question 19 - 2002 HSC
(a) Describe the conditions under which a nucleus is unstable. (b) Describe processes by which an unstable isotope undergoes radioactive decay, using a flow diagram showing the sequence of products released during the decay of uranium.
Written Paper
Section I
Question 20 - 2002 HSC
(a) Identify a common household base. (b) Assess the validity of a conclusion that all colourless solutions tested in an experiment were basic, using a table of results and a table of indicator colours at various pH levels.
Written Paper
Section I
Question 21 - 2002 HSC
Evaluate the impact of industrial sources of sulfur dioxide and nitrogen oxides on the environment, making use of appropriate chemical equations.
Written Paper
Section I
Question 22 - 2002 HSC
(a) Calculate the pH of a hydrochloric acid solution, given equal concentrations of hydrochloric acid, sulfuric acid and acetic acid and a known pH for the acetic acid. (b) Compare the pH values of the sulfuric acid and hydrochloric acid solutions. (c) Explain why the acetic acid solution has a higher pH than the hydrochloric acid solution.
Written Paper
Section I
Question 23 - 2002 HSC
(a) Identify the gas released when the cap is removed from a bottle of soft drink. (b) Given a graph showing how the mass of cap, bottle and contents changes over time, calculate the volume of gas released at 25°C and 101.3kPa (Note: since 2003 HSC, molar volume is expressed at 100kPa).
