1.
State what is meant by a volumetric flask. [1]
JD SCIENCE
Scientific techniques and SOPs (PO1)
Answer all questions. Show working. Answers are in a separate file on the Worksheets page — do not look at them until you have finished.
2.
State what is meant by a burette. [1]
3.
State what is meant by a balance. [1]
4.
State what is meant by pH measurement. [1]
5.
State what is meant by chromatography. [1]
6.
State what is meant by spectroscopy. [1]
7.
State what is meant by microscopy. [1]
8.
State what is meant by centrifugation. [1]
9.
State what is meant by an SOP. [1]
10.
State what is meant by sample integrity. [1]
11.
Noah is asked about a volumetric flask in a NCFE Laboratory Sciences paper.
(a) Describe a volumetric flask. [2]
(b) Explain why a volumetric flask is important in this topic. [3]
12.
Noah is asked about a burette in a NCFE Laboratory Sciences paper.
(a) Describe a burette. [2]
(b) Explain why a burette is important in this topic. [3]
13.
Noah is asked about a balance in a NCFE Laboratory Sciences paper.
(a) Describe a balance. [2]
(b) Explain why a balance is important in this topic. [3]
14.
Noah is asked about pH measurement in a NCFE Laboratory Sciences paper.
(a) Describe pH measurement. [2]
(b) Explain why pH measurement is important in this topic. [3]
15.
Noah is asked about chromatography in a NCFE Laboratory Sciences paper.
(a) Describe chromatography. [2]
(b) Explain why chromatography is important in this topic. [3]
16.
Noah is asked about spectroscopy in a NCFE Laboratory Sciences paper.
(a) Describe spectroscopy. [2]
(b) Explain why spectroscopy is important in this topic. [3]
17.
A 250 cm³ flask is used for 0.100 mol dm⁻³ NaOH. Mass of NaOH (M=40)? [3]
18.
Beer–Lambert: A = εcl. A=0.60, ε=2000, l=1.0 cm. c? [3]
19.
Rf = 3.6 / 9.0 [3]
20.
A centrifuge runs at 3000 rpm for 10 min. Total revolutions? [3]
21.
Titres 24.10, 24.20, 24.15. Mean? [3]
22.
A 10 cm³ pipette delivers 9.96 cm³. Percentage error? [3]
23.
Noah carries out a T-Level occupational task on laboratory techniques and SOPs. This is a typical NCFE required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
24.
Noah carries out writing or following an SOP for laboratory techniques and SOPs. This is a typical NCFE required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
25.
Noah carries out a COSHH / risk-assessment review for laboratory techniques and SOPs. This is a typical NCFE required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
26.
Noah carries out data review in a LIMS or quality log for laboratory techniques and SOPs. This is a typical NCFE required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
27.
Compare a volumetric flask with pH measurement. [4]
28.
Compare a burette with chromatography. [4]
29.
Compare a balance with spectroscopy. [4]
30.
Compare pH measurement with microscopy. [4]
31.
Apply your knowledge of microscopy to this situation: light or electron [3]
32.
Apply your knowledge of centrifugation to this situation: balance the tubes [3]