DETERMINATION OF THE GAS CONSTANT - Writing Laboratory Reports
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GASCONSTANT-markingScheme-2017.docxDETERMINATION OF THE GAS CONSTANT – Marking Scheme
Name: ............................ Date: ........................ Maximum marks: 20
OBJECTIVES: [1 mark]
INTRO: [1 mark]
80 to 200 words (> 300 words = -0.5 marks)
METHOD: Reference laboratory manual and mention changes only [1 mark]
RESULTS (show all calculations and units) [9 marks]
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Weight of magnesium: |
[0.5 mark] |
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Calculated moles of magnesium used:
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[1 mark]
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Volume of hydrogen collected: |
[0.5 mark] |
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Temperature of water: |
[0.5 mark] |
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Laboratory pressure (atm): (1 atmosphere = 1.013 x 105 pascal) |
[0.5 mark]
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Water vapour pressure: (See Table 1 in Introduction) Graph must be included |
[1 mark]
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Pressure of hydrogen (= Lab. pressure - Water vapour pressure) |
[1 mark]
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Calculation: R = PV = nT |
[2 marks]
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Units, Significant figures etc |
[1 mark]
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% error |
[1 mark]
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DISCUSSION [5 marks]
300 – 600 words (> 700words = -0.5 marks)
About the experiment and results:
What you have derived from the results- for example-behaviour of gases
Experimental errors: at least 2 valid reasons
Theoretical errors: at least 2 valid reasons
How to minimise the errors:
Other ideas, Applications of this experiment, thinking outside the box
CONCLUSION [2 marks]
80 – 200 words (> 300words = -0.5 marks)
REFERENCES [1 mark]
Use CDU Harvard style or APA6th. More details can be found at http://libguides.cdu.edu.au/cdureferencing
A minimum of 4 relevant references are required.
