0654.B4.1.03 — Describe the use of: (a). iodine solution test for starch (b). Benedict’s solution test for reducing sugars (c). biuret test for proteins (d: past paper questions
Real questions on 0654.b4.1.03 — describe the use of: (a). iodine solution test for starch (b). benedict’s solution test for reducing sugars (c). biuret test for proteins (d
The newest 8 of 8 written questions. Open one to see it on the real paper.
- 0973/31 · May/June 2024 · Q10d[1]
State the name of the solution used to test for the presence of protein.
See it on the paper → - 0973/41 · October/November 2023 · Q7c(ii)[1]
State the name of the chemical test for the presence of proteins.
See it on the paper → - 0973/31 · October/November 2022 · Q1b(i)[1]
State the colour iodine solution turns when added to starch.
See it on the paper → - 0973/31 · October/November 2022 · Q1b(ii)[1]
Circle the component from which starch is made. amino acids fatty acids glycerol glucose glycogen
See it on the paper → - 0973/41 · October/November 2021 · Q2d[2]
The atoms in a molecule of nitrogen, N 2 , are held together by covalent bonds. The electronic structure of nitrogen is 2,5. Draw the dot-and-cross diagram to show the bonding in nitrogen. You only need to include the outer shell electrons.
See it on the paper → - 0973/32 · May/June 2020 · Q4b(ii)[2]
Describe how to test a substance for protein. Include the positive result.
See it on the paper → - 0973/31 · May/June 2019 · Q10b[3]
The meal contains fats. Describe the test for fats and the positive result. test positive result
See it on the paper → - 0973/42 · May/June 2019 · Q1c[2]
A solution containing an enzyme is tested with biuret solution. State the colour change you would expect. Give a reason for your answer. the colour changes from to reason
See it on the paper →
What examiners said
Candidates usually gave the name of the test as Biuret but there were a few candidates who gave the answer burette or Benedict’s test.
— Examiner report, October/November 2023, 0973/41 Q7(c)(ii) (Cambridge)
Many candidates knew that it was the emulsion test and the positive result. Fewer could describe the test.
— Examiner report, May/June 2019, 0973/31 Q10(b) (Cambridge)
This proved more challenging for candidates, with many confusing Biuret reagent with Benedict’s solution. Those candidates that did identify the correct colours, generally also described enzymes as being proteins.
— Examiner report, May/June 2019, 0973/42 Q1(c) (Cambridge)
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