Chemistry 0620 · IGCSE · Simple molecules and covalent bonds

Simple molecules and covalent bonds — practice question

The diagrams for seven compounds or elements, A, B, C, D, E, F and G, are shown. A is a molecule in which two carbon atoms are joined together, with each carbon atom bonded to hydrogen atoms. B is a layered giant covalent arrangement of hexagonal rings. C is N≡N. D shows phosphorus bonded to three chlorine atoms. E is an alcohol molecule containing C, H and O atoms. F is H-O-H. G is an unsaturated hydrocarbon with a C=C bond.
(a(i))[1]

Answer the questions below using these structures. Any structure may be chosen once, more than once or not at all. State which structure, A, B, C, D, E, F or G, shows a compound that contains atoms of a Group VII element.

(a(ii))[1]

State which structure, A, B, C, D, E, F or G, shows an element with a giant covalent structure.

(a(iii))[1]

State which structure, A, B, C, D, E, F or G, shows a compound that turns anhydrous copper(II) sulfate blue.

(a(iv))[1]

State which structure, A, B, C, D, E, F or G, shows an element that conducts electricity.

(a(v))[1]

State which structure, A, B, C, D, E, F or G, is an unsaturated hydrocarbon.

(b)[2]

Describe a test for an unsaturated hydrocarbon. reagent … result …

(c)[2]

Name the two products made when compound A undergoes complete combustion.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Structure D” …

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