Page 6 Extract discriminating selection use and presentation of scientific data

Page 6 extract discriminating selection use and

This preview shows page 9 - 13 out of 21 pages.

Page 6 Extract discriminating selection, use and presentation of scientific data and ideas to make meaning accessible to intended audiences through innovative use of a table This represents the most recent data on heats of combustion Linking and application of concepts, principles, theories and schema to find solutions in complex and challenging situations The values were used to calculate the bond dissociation energies of the compounds These values will be compared with experimental and bond energy calculation values These values show the energy stored within the molecule
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10 | Chemistry 2007 Sample assessment and indicative responses Comments Page 7 Extract Calculating the heat of combustion from bond dissociation energy values. Page 7 extract shows that the bond dissociation energy calculations for the branched materials were the same. Page 10 Extract linking and application of algorithms and concepts to find solutions in a complex and challenging situation The student understands the term exothermic and energy diagrams The student has used secondary data in the decision making process for the design of the investigation formulation of justified significant questions/hypoth eses which inform effective and efficient design, refinement and management of investigation The stored chemical energy for methanol is 653kJ Hypothesis/question has been modified due to research All calculations are based on this method
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Queensland Studies Authority February 2013 | 11 Comments Page 12 Extract Page 10 Extract Several calorimetry methods were compared. Methanol CH 3 OH Ethanol C 2 H 5 OH 1-propanol C 3 H 7 OH 1-butanol (n-butanol) C 4 H 9 OH 1-pentanol C 5 H 11 OH 1-hexanol C 6 H 13 OH 1-heptanol C 7 H 15 OH The student identified the 3 dimensional shapes of each of the compounds linking and application of concepts, principles, theories and schema to find solutions in a complex and challenging situation The student identified the placement of the thermometer, the support of the thermometer, heat loss to the surroundings and sufficient fuel in the burner as issues in the methodology comparison and explanation of complex concepts, processes and phenomena This basic set up was considered to be too inefficient to gather accurate and valid This bomb calorimeter is a specialised piece of equipment but has features that could be incorporated into a set-up.
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12 | Chemistry 2007 Sample assessment and indicative responses Comments Page 13 Extract The efficiency of the apparatus was tested and found to be 51.21%. An initial trial showed the efficiency at 49.93%. The student considered this too low. Mathematical check was done to see how much fuel was needed to raise the temperature of 100g of water by 20 0 C. This was 0.2812g. effective and efficient design, refinement and management of the investigation The student now has a planned course of action for the investigation The student has addressed the issues associated with the equipment Refinement of the cover to minimise heat loss Application of the algorithm q = m x C x T
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