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Embed code for: BS5051 Sample Progress Test(1)
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BS5051 – FUNDAMENTALS OF BIOANALYTICAL SCIENCE
SAMPLE PROGRESS TEST
30 MINUTES ALLOWED
ANSWER THE QUESTIONS IN THE SPACES PROVIDED.
ANSWER AS MANY QUESTIONS AS YOU CAN IN THE TIME ALLOWED
THERE ARE 30 MARKS AVAILABLE.
1. List the five main steps in an analysis. Indicate which one is considered to be the most important and briefly explain why this is so.
Explain the difference between accuracy and precision in analytical measurements.
Fill in the blanks below.
In an analytical method, we are asked to measure the level of iron in a vitamin tablet.
For the purposes of the analysis, we call iron the __________________
For the purposes of the analysis, the rest of the tablet, apart from the iron is
called the __________________.
In order to perform the analysis, a weighed amount of the tablet material is
digested to form a solution. It is then compared to a series of iron solutions of
known concentration. These known solutions are called ______________ solutions.
A technique like this which requires calibration is known as an ______________
technique whereas titration which does not require calibration is known as an
_________________ technique. The results for this analysis showed good agreement with each other, the analysis was therefore said to show good
State three of the four main energy storage mechanisms in a molecule.
5. A photon has a frequency (ν) of 4.73 x 1013 Hz. Use the relationships E = hν and c = λν to calculate the wavelength of the photon and the energy contained by 1 mol of such photons. To what region of the electromagnetic spectrum does this photon belong? (Choose from Ultraviolet, Visible, Infrared or Microwave)
c = 2.9979 x 108 m s-1 h = 6.626 x 10-34 J s NA = 6.022 x 1023 mol-1
6 . An aqueous solution is known to have a concentration of 4.312 x 10-3 mol dm-3 in uric acid (Mr = 168.1). What is the concentration of uric acid in ppm?
7. A powdered sample of cornflakes (1.0548 g) was digested with acid (15 cm3) and the resulting solution diluted to 100 mL using a volumetric flask. The concentration of vitamin D in the solution was found to be 0.42 ppb (or µg L-1). Calculate the concentration of vitamin D in the cornflakes. How much vitamin D would you obtain by eating a 100 g portion of these cornflakes.