Chemistry 0620 · IGCSE · Elements, compounds and mixtures

Elements, compounds and mixtures — practice question

The diagram illustrates the structures of five substances, A, B, C, D and E. A is a molecule in which sulfur is double-bonded to two oxygen atoms (sulfur dioxide). B shows alternating NH$_4^+$ and Cl$^-$ ions in a lattice. C shows N≡N. D is a nitrogen atom bonded to three hydrogen atoms. E shows O=C=O. Use only the structures in the diagram to answer the questions below. Each structure may be chosen once, more than once, or not chosen at all.
(a(i))[1]

Which structure, A, B, C, D or E, is a compound used in fertiliser?

(a(ii))[1]

Which structure, A, B, C, D or E, is a diatomic molecule?

(a(iii))[1]

Which structure, A, B, C, D or E, contains chloride ions?

(a(iv))[1]

Which structure, A, B, C, D or E, is a gas that turns damp red litmus paper blue?

(a(v))[1]

Which structure, A, B, C, D or E, is an element?

(b(i))[1]

State one source from which sulfur dioxide is produced.

(b(ii))[1]

Give one adverse health effect caused by sulfur dioxide.

(c)[3]

Deduce the number of protons, neutrons and electrons in this isotope of nitrogen.

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