0654.C2.3.01 — Define isotopes as different atoms of the 3 State that isotopes of the same element same element that have the same number of have the same : past paper questions
Real questions on 0654.c2.3.01 — define isotopes as different atoms of the 3 state that isotopes of the same element same element that have the same number of have the same
The newest 12 of 12 written questions. Open one to see it on the real paper.
- 0654/32 · May/June 2025 · Q5b(i)[2]
State what is meant by the term isotope.
See it on the paper → - 0654/32 · May/June 2025 · Q5b(ii)[1]
State why the relative atomic mass, A r , of chlorine is 35.5. (ii)
See it on the paper → - 0654/32 · May/June 2025 · Q5b(iv)[2]
Sodium chloride is also made by reacting an acid with an alkali. State the acid and the alkali that is used. acid
See it on the paper → - 0654/32 · May/June 2025 · Q5b(v)[1]
Chlorine is a halogen. The halogens are found in Group VII of the Periodic Table and have similar chemical properties. Explain why the halogens have similar chemical properties.
See it on the paper → - 0654/32 · May/June 2025 · Q6a(i)[1]
Explain why ethanol is not a hydrocarbon. (i)
See it on the paper → - 0654/33 · May/June 2025 · Q5b(i)[2]
State what is meant by the term isotope.
See it on the paper → - 0654/33 · May/June 2025 · Q5b(ii)[1]
State why the relative atomic mass, A r , of chlorine is 35.5. (ii)
See it on the paper → - 0654/41 · May/June 2025 · Q6c[1]
Carbon-12 and carbon-13 are two isotopes of the element carbon. These isotopes of carbon have the same chemical properties. Explain why.
See it on the paper → - 0654/42 · February/March 2025 · Q5e[2]
Explain why 37 35 Cl and Cl are isotopes of the element chlorine. 17 17
See it on the paper → - 0654/22 · October/November 2019 · Q17[1]
is the definition of the relative atomic mass, Ar, of an element?
See it on the paper → - 0654/21 · May/June 2019 · Q15[1]
Why do isotopes of the same element have the same chemical properties?
See it on the paper → - 0654/21 · May/June 2019 · Q40[1]
Which statement about the nuclei of these three isotopes is correct?
See it on the paper →
What examiners said
Another definition that proved demanding for candidates. Some were confused in their use of terms and those who attempted the definition often confused protons and neutrons.
— Examiner report, May/June 2025, 0654/32 Q5(b)(i) (Cambridge)
Candidates did not understand that relative atomic mass is the average mass of all the atoms of an element. Many incorrectly thought it contained half a proton or neutron, or that the 0.5 was due to the mass of electrons. This showed a number of misconceptions about the mass of the different sub-atomic particles and how they contribute to the mass of an atom.
— Examiner report, May/June 2025, 0654/32 Q5(b)(ii) (Cambridge)
The majority of candidates incorrectly wrote two of sodium, chloride and hydrogen. Some were able to identify hydrochloric acid but it was very rare to see sodium hydroxide as the alkali.
— Examiner report, May/June 2025, 0654/32 Q5(b)(iv) (Cambridge)
Past papers, syllabus and examiner reports © UCLES (Cambridge University Press & Assessment). Questions are matched to topics from the official syllabus. AssessPro is independent and not endorsed by Cambridge.