Chemistry 0620 · IGCSE · Isotopes

Isotopes — practice question

The diagrams show the structures of five substances, A, B, C, D and E. A contains an ionic lattice with Na⁺ and Br⁻ ions arranged in alternating positions. B is a molecule in which two carbon atoms are bonded to each other, and each carbon is also bonded to hydrogen and bromine atoms. C represents O=C=O. D has a central iodine atom joined to three chlorine atoms. E represents O=O. Use only the substances shown in the diagram to answer the questions below. A substance may be chosen once, more than once or not chosen at all.
(a(i))[1]

State which substance, A, B, C, D or E, is a molecule containing two atoms.

(a(ii))[1]

State which substance, A, B, C, D or E, has bromide ions present.

(a(iii))[1]

State which substance, A, B, C, D or E, is made of just one element.

(a(iv))[1]

State which substance, A, B, C, D or E, is a gaseous product of respiration.

(a(v))[1]

State which substance, A, B, C, D or E, produces a yellow flame in a flame test.

(b)[3]

Deduce how many protons, neutrons and electrons are present in this oxygen isotope.

(c)[2]

Describe a test for oxygen. method observation

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “E / oxygen / $\text{O}_2$” …

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