HSC_Chem_Past_Paper_Sol

Corrosion and conservation the biochemistry of

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Unformatted text preview: The Chemistry of Art: Forensic Chemistry: _____________________________________________________________________________________________________ HSC CHEMISTRY PAST PAPER SOLUTIONS – ANDREW HARVEY 7 2000 HSC ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 2005 HSC SECTION I - Part A: Question 1: Question 2: Question 3: 2676 kJ per (12.04*4 + 1.008*10 + 16.00) g = x kJ per 1 g Therefore, <math>x = \frac {2676}{12.01 \times 4 + 1.008 \times 10 + 16.00} = 36.10</math> Question 4: Question 5: Question 6: Ethyl Pentanoate is an ester. Esters are used for flavouring. Question 7: Question 8: H<sub>2</sub>SO<sub>4</sub> <math>pH = - \log_{10} \left ( 2 \times 0.1 \right ) = 0.69897</math> Question 9: Question 10: Question 11: AAS is used to detect concentrations of ''metal'' ions. Question 12: Question 13: Question 14: Question 15: SECTION I - Part B: Question 16 (a): Cyclohexene Question 16 (b): Cyclohexene is flammable. If it ignites it could injure people. To avoid this we made sure there was no open flames near the substances. We also wore safety goggles and a lab coat. _____________________________________________________________________________________________________ HSC CHEMISTRY PAST PAPER SOLUTIONS – ANDREW HARVEY 8 2000 HSC ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– :"Responses that successfully linked the identified hazard and how it was addressed scored well. Responses that scored poorly did not identify a specific hazard for the first hand investigation and/or used vague or generic terms to outline how to address the hazard."<sup>1</sup> Question 16 (c): The alkene and corresponing alkane were placed in sepearte beakers. Bromine water (diluted Br<sub>2</sub>) was placed in each beaker. The colour change of the bromin water was observed. :"Better responses indicated the key elements of a safe, experimental procedure and identified appropriate reactants for this investigation. Weaker responses incorrectly included results and presented contradictory data."<sup>1</sup> Question 17 (a): Not all of the heat is produced by the combustion of the ethanol went into heating the water. Some of the heat was lost to the air, etc. Question 17 (b): <math>\frac {200 \times 4.18 \times 10^{-3} \times \left ( 45 - 21 \right )}{x} = \frac {1367}{1 \times \left ( 12.01 \times 2 + 1.008 \times 6 + 16.00 \right )}</math> <math>x = \frac {200 \times 4.18 \times 10^{-3} \times \left ( 45 - 21 \r...
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