Isotopes: past paper questions
Real questions on isotopes
The newest 15 of 15 written questions. Open one to see it on the real paper.
- 5070/21 · October/November 2025 · Q2a[1]
Describe one difference between the isotopes 32 16 S and 16 S.
See it on the paper → - 5070/21 · October/November 2025 · Q2b[1]
Explain why all the isotopes of sulfur have the same chemical properties.
See it on the paper → - 5070/22 · October/November 2025 · Q2a[1]
Describe one difference between the isotopes 2 4 2 6 Ti and 2 4 2 7 Ti.
See it on the paper → - 5070/22 · October/November 2025 · Q2b[1]
Explain why all the isotopes of titanium have the same chemical properties.
See it on the paper → - 5070/22 · October/November 2025 · Q2c[2]
Show by calculation that the relative atomic mass of titanium for this sample is 47.84.
See it on the paper → - 5070/21 · October/November 2022 · Q2b(i)[1]
Name the products of photosynthesis. and
See it on the paper → - 5070/21 · October/November 2022 · Q2c(i)[1]
Name the other product of the complete combustion of hydrocarbons.
See it on the paper → - 5070/21 · May/June 2022 · Q4c[1]
K is the full symbol for one isotope of potassium. 19 Suggest the full symbol for one other isotope of potassium.
See it on the paper → - 5070/21 · May/June 2021 · Q2d(i)[1]
Give one similarity in the atomic structure of these two isotopes.
See it on the paper → - 5070/21 · May/June 2021 · Q2d(ii)[1]
Give one difference in the atomic structure of these two isotopes.
See it on the paper → - 5070/22 · May/June 2021 · Q2c(i)[1]
Explain why both isotopes have the same chemical properties.
See it on the paper → - 5070/22 · May/June 2021 · Q2c(ii)[1]
Give one difference in the atomic structure of these two isotopes.
See it on the paper → - 5070/21 · October/November 2019 · Q8a[3]
One of the isotopes of silicon is: 30 14 Si Deduce the number of electrons, neutrons and protons in one atom of this isotope of silicon. number of electrons number of neutrons number of protons
See it on the paper → - 5070/22 · October/November 2019 · Q8a(i)[3]
Deduce the number of electrons, neutrons and protons in this isotope of phosphorus. number of electrons number of neutrons number of protons
See it on the paper → - 5070/22 · October/November 2019 · Q8a(ii)[1]
What is the meaning of the term isotopes?
See it on the paper →
What examiners said
The products of photosynthesis were quite well known. Starch, carbohydrates and water were common incorrect responses.
— Examiner report, October/November 2022, 5070/21 Q2(b)(i) (Cambridge)
Many candidates gave a product of combustion. Hydrogen, carbon dioxide and sulfur dioxide were common incorrect responses.
— Examiner report, October/November 2022, 5070/21 Q2(c)(i) (Cambridge)
Many candidates derived the symbol correctly. ‘K+’ was the most common incorrect response and some gave the mass number as 39.
— Examiner report, May/June 2022, 5070/21 Q4(c) (Cambridge)
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