HSC_Chem_Past_Paper_Sol

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Unformatted text preview: l chloride monomer): Used in electrical wire coating because it is an electrical insulator, tough and flexible. Also used in water pipes as it is a non-metal it does not corrode or rust. OR Polystyrene (made from the styrene monomer): Used for foam cups as it is a good insulator of heat. Also used for packaging as it is easy to mould to various complex shapes. For full marks you need 2 uses and 2 properties. (c) Polymer made from the vinyl chloride monomer: [[Image:sci_chem_pastpapers_2004hsc_17c_1.png|Polyvinylchloride (PVC)]] OR sometimes drawn as, (The above method is better though. See 2004 HSC Notes from the Examination Centre – Chemistry, p7.) H H H H C C C C H Cl n H Cl Polymer made from the styrene monomer: _____________________________________________________________________________________________________ HSC CHEMISTRY PAST PAPER SOLUTIONS – ANDREW HARVEY 17 2000 HSC ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– [[Image:sci_chem_pastpapers_2004hsc_17c_3.png|Polystyrene]] OR sometimes drawn as, (The above method is better though. See 2004 HSC Notes from the Examination Centre – Chemistry, p7.) H H H H C C C C H C6H5 n H C6H5 Question 18: Question 19: Question 20: Question 21: (a) Qualitative analysis refers to observing qualities, properties or observations and making a judgement based on these observations. Quantitative analysis refers to performing numerical calculations based on data from experiment or other to make a judgement. (b) (c) Question 22: (a) Amphiprotic substances are able to act as both proton donors and proton acceptors. (b) H<sub>2</sub>PO<sub>4</sub><sup>–</sup> + H<sub>2</sub>O → H<sub>3</sub>O<sup>+</sup> + HPO<sub>4</sub><sup>2-</sup> H<sub>2</sub>PO<sub>4</sub><sup>–</sup> + H<sub>3</sub>O<sup>+</sup> → H<sub>2</sub>O + H<sub>3</sub>PO<sub>4</sub> Question 23: Question 24: (a) <math>n = cv</math> <math>n = 0.01 \times 10 = 0.1</math> <math>c = \frac {n}{v} = \frac {0.1}{10 + 90} = 0.001</math> mol L<sup>-1</sup> <math>pH = -log_10 0.001 = 3.00</math> (b) They are used as food additives as they (c) Question 25: Question 26: Question 27: _____________________________________________________________________________________________________ HSC CHEMISTRY PAST PAPER SOLUTIONS – ANDREW HARVEY 18 2000 HSC ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––...
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This document was uploaded on 09/19/2013.

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