0653.B13.1.01 — Describe a drug as any substance taken into the body that modifies or affects chemical reactions in the body: past paper questions
Real questions on 0653.b13.1.01 — describe a drug as any substance taken into the body that modifies or affects chemical reactions in the body
The newest 6 of 6 written questions. Open one to see it on the real paper.
- 0653/43 · October/November 2025 · Q3c[1]
Describe what is meant by the term drug. (c) Antibiotics are drugs used to treat bacterial infections.
See it on the paper → - 0653/63 · May/June 2023 · Q2a(i)[1]
Describe how to do a flame test on the blue solution.
See it on the paper → - 0653/63 · May/June 2023 · Q2a(ii)[1]
The blue solution gives a blue-green flame in the flame test. Tick(✓) the box to identify the cation present in the blue solution. lithium sodium copper( II ) potassium
See it on the paper → - 0653/63 · May/June 2023 · Q2b(i)[2]
Fig. 2.1 shows the readings on the balance after heating for 2 minutes and 7 minutes. mass after heating for 2 minutes mass after heating for 7 minutes 4.176 g 3.604 g Fig. 2.1 Record in Table 2.1 these values to two decimal places.
See it on the paper → - 0653/63 · May/June 2023 · Q2b(ii)[1]
Calculate the mass lost during heating for 2 minutes and for 7 minutes. Use the equation shown. mass lost during heating = 5.00 – mass after heating Record your values in Table 2.1.
See it on the paper → - 0653/63 · May/June 2023 · Q2b(iii)[3]
On the grid, plot the mass lost during heating (vertical axis) against the time of heating.
See it on the paper →
What examiners said
Few candidates were able to describe how to carry out a flame test, often omitting to state that the Bunsen flame should be blue. Common mistakes included describing how to test for certain gases or simply stating that the solution should be put in a flame.
— Examiner report, May/June 2023, 0653/63 Q2(a)(i) (Cambridge)
Most candidates correctly read the two values and recorded them to two decimal places.
— Examiner report, May/June 2023, 0653/63 Q2(b)(i) (Cambridge)
Candidates were able to use their values to calculate the mass lost during heating.
— Examiner report, May/June 2023, 0653/63 Q2(b)(ii) (Cambridge)
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