0654.B10.1.03 — State that vaccinations are available for some 14 Explain the role of vaccination in controlling pathogens to help control the spread of the: past paper questions
Real questions on 0654.b10.1.03 — state that vaccinations are available for some 14 explain the role of vaccination in controlling pathogens to help control the spread of the
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- 0973/41 · May/June 2026 · Q4d(ii)[3]
Figure 4.1 shows the number of cases of polio in one country from 1910 to 2020. 354 304 254 number of 904 cases per 100000 population 154 104 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2020 year Figure 4.1 The polio vaccine was first produced in 1955. Explain the role of vaccination in controlling the sprea...
See it on the paper → - 0973/41 · May/June 2026 · Q4d(iii)[2]
(iii) In the country, each child is given four doses of polio vaccine. The fertility rate in the country in 2022 was 56 births per 1000 women aged 18-44. There were 6.55 x 10” women aged 18-44 in the country in 2022. Use calculations to estimate the number of doses of polio vaccine needed to fully vaccinate the childre...
See it on the paper → - 0973/41 · May/June 2022 · Q5a(i)[1]
Describe how the pH of the acid changes as the alkali is added.
See it on the paper → - 0973/41 · May/June 2022 · Q5a(ii)[1]
Complete the word equation to show the type of substance made in the reaction. + water acid + alkali
See it on the paper → - 0973/41 · May/June 2022 · Q5a(iii)[2]
Sulfuric acid, H 2 SO 4 , is an acid. Potassium hydroxide, KOH, is an alkali. Construct the balanced symbol equation for the reaction of sulfuric acid with potassium hydroxide. + +
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What examiners said
This question required candidates to describe the numerical change in the pH value of an acid as alkali is added. Many candidates failed to gain a mark by describing that the acid was neutralised or became less acidic, rather than giving a quantitative description of the pH increasing.
— Examiner report, May/June 2022, 0973/41 Q5(a)(i) (Cambridge)
Most candidates correctly stated the type of substance being produced as a salt. A small number tried to answer this question with the name of a specific compound.
— Examiner report, May/June 2022, 0973/41 Q5(a)(ii) (Cambridge)
Candidates were challenged by the question, with a very small number being able to correctly determine the formula of the salt produced and balance the equation. Many candidates did not appreciate that the sulfate ion will remain intact after the reaction, with compounds such as potassium sulfide and potassium oxide being included as products.
— Examiner report, May/June 2022, 0973/41 Q5(a)(iii) (Cambridge)
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