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Uncertainty in Measurements · CAPE Chemistry Unit 2

28 past-paper questions on Uncertainty in Measurements, part of Analytical Methods and Separation Techniques, from every CAPE Chemistry Unit 2 paper on Quelpr.

Practise Uncertainty in Measurements
  1. 2(d)1 mark· CAPE Chemistry Unit 2 · 2006 · Paper 2What precaution must be taken when performing the reaction in (b)(iii) in the laboratory?
  2. 1(b)(ii)2 marks· CAPE Chemistry Unit 2 · 2007 · Paper 2State TWO precautions that should be taken to ensure the experiment yields accurate results.
  3. 3(b)(ii)2 marks· CAPE Chemistry Unit 2 · 2007 · Paper 2Calculate the average concentration of PO4^3- found in the three samples.
  4. 2(a)3 marks· CAPE Chemistry Unit 2 · 2011 · Paper 2Distinguish between the terms 'precision' and 'accuracy'.
  5. 2(b)2 marks· CAPE Chemistry Unit 2 · 2011 · Paper 2List THREE pieces of apparatus that could be used to accurately measure 50 cm³ of a liquid.
  6. 2(c)(i)2 marks· CAPE Chemistry Unit 2 · 2011 · Paper 2Complete Table 2 by calculating the standard deviation (SD) of EACH of the four sets of results using the provided formula.
  7. 2(c)(ii)4 marks· CAPE Chemistry Unit 2 · 2011 · Paper 2Evaluate the results obtained by EACH student by commenting on the accuracy and precision of EACH set of titre volumes.
  8. 2(d)4 marks· CAPE Chemistry Unit 2 · 2011 · Paper 2Outline the experimental steps that should be taken by a student to calibrate a 10 cm³ pipette.
  9. Q161 mark · multiple choice· CAPE Chemistry Unit 2 · 2012 · Paper 1Which of the following may be eliminated by calibrating a measuring instrument?
  10. Q161 mark · multiple choice· CAPE Chemistry Unit 2 · 2014 · Paper 1Which of the following inaccuracies may be eliminated by calibrating a measuring instrument?
  11. Q161 mark · multiple choice· CAPE Chemistry Unit 2 · 2015 · Paper 1Which of the following factors will NOT affect the accuracy of the results in a titrimetric analysis?
  12. 2(a)(i)1 mark· CAPE Chemistry Unit 2 · 2015 · Paper 2In a titrimetric analysis, state ONE operation which can affect accuracy.
  13. 2(a)(ii)1 mark· CAPE Chemistry Unit 2 · 2015 · Paper 2In a titrimetric analysis, state ONE operation which can affect precision.
  14. Q161 mark · multiple choice· CAPE Chemistry Unit 2 · 2016 · Paper 1Which of the following statements is NOT true about the detection limit of an instrument?
  15. Q191 mark · multiple choice· CAPE Chemistry Unit 2 · 2016 · Paper 1Which of the following inaccuracies may be eliminated by calibrating a measuring instrument?
  16. 2(a)(i)2 marks· CAPE Chemistry Unit 2 · 2017 · Paper 2Define the term 'accuracy'.
  17. 2(a)(ii)2 marks· CAPE Chemistry Unit 2 · 2017 · Paper 2Define the term 'precision'.
  18. 2(a)(i)4 marks· Chemistry · Unit 2 Q2 2(a)(i)Define EACH of the following terms: Accuracy
  19. 2(a)(i)2 marks· Chemistry · Unit 2 Q2 2(a)(i)Calculate the mean volume.
  20. 2(a)(ii)4 marks· Chemistry · Unit 2 Q2 2(a)(ii)Define EACH of the following terms: Precision
  21. 2(a)(ii)2 marks· Chemistry · Unit 2 Q2 2(a)(ii)Calculate the standard deviation in the mean volume given. S = √(Σ(x-x̄)² / (n-1))
  22. 2(a)(iii)5 marks· Chemistry · Unit 2 Q2 2(a)(iii)Outline the FIVE steps to be taken to determine the accuracy and uncertainty in dispensing 15.0 mL of water from a burette.
  23. 2(a)(iv)2 marks· Chemistry · Unit 2 Q2 2(a)(iv)Given the volumes delivered from A, B and C, state which glassware should give EACH of the following. The most accurate volume. The least accurate volume.
  24. 2(b)2 marks· Chemistry · Unit 2 Q2 2(b)In preparing the solution of ethanedioic acid for titration against the manganate (VII) solution, two pieces of laboratory apparatus with a high degree of accuracy are required. Name these TWO pieces of apparatus.
  25. 2(d)(i)1 mark· Chemistry · Unit 2 Q2 2(d)(i)Define the term 'mean volume'.
  26. 2(d)(ii)2 marks· Chemistry · Unit 2 Q2 2(d)(ii)Determine the mean volume from the titre values (to be used in the calculations).
  27. 2(d)(iii)1 mark· Chemistry · Unit 2 Q2 2(d)(iii)Define the term 'standard deviation'.
  28. 2(d)(iv)3 marks· Chemistry · Unit 2 Q2 2(d)(iv)Using the following equation, justify the choice of the titre values selected in (d)(ii). S = √[Σ(x-x)² / (n-1)]

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