Chemistry — A-Level — SyllabAI Hub

11 markeasy

Which diagram shows the structure and bond angle of a molecule of hydrazine, N₂H₄?

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21 markeasy

Boron trifluoride, BF₃, and the borohydride ion, BH₄^-, have different shapes.

Which row gives the shape around the boron atom in these species?

	BF₃	BH₄^-
A	pyramidal	tetrahedral
B	pyramidal	square planar
C	trigonal planar	tetrahedral
D	trigonal planar	square planar

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31 markeasy

What is the bond angle in a trigonal planar molecule?

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107°

109.5°

120°

180°

41 markmedium

The following equation shows the dissociation equilibrium of PCl₅.

PCl₅ (g) ⇌ PCl₃ (g) + Cl₂ (g)

The percentage yield of PCl₃ in the equilibrium mixture varies with temperature. At 160°C the yield is 13%, and at 300°C the yield is approximately 100%.

Which row gives the forward reaction and the shape of a PCl₃ molecule?

	forward reaction	shape of PCl₃molecule
A	exothermic	pyramidal
B	exothermic	trigonal planar
C	endothermic	pyramidal
D	endothermic	trigonal planar

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51 markmedium

Which species has a bond angle of 120°?

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BCl₃

H₃O⁺

NH₃

TlBr₃^2-

61 markmedium

The structure of ibuprofen is shown.

Skeletal formula of ibuprofen with bond angles a and b labelled at two different carbon atoms

Which row gives the bond angles a and b?

	a	b
A	107°	109.5°
B	109.5°	120°
C	120°	109.5°
D	120°	120°

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71 markmedium

Which species has a bond angle of 104.5°?

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CH₄

CO₂

NH₂^-

NH₄⁺

81 markhard

Two reactions are shown.

PCl₅ → PCl₆^-

C₂H₄ → C₂H₆

Which change occurs in both reactions?

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a change in the oxidation state of an element

a decrease in bond angle

the disappearance of a π bond

the formation of a lone pair of electrons

91 markhard

Boron trifluoride, BF₃, reacts with trimethylamine, (CH₃)₃N, to form a compound of formula (CH₃)₃N.BF₃.

Which equation correctly illustrates the shapes of the molecules involved in this reaction?

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101 markhard

What is the shape of a ClF₂^- ion?

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bent

linear

T-shaped

trigonal planar

Shapes of Molecules — Multiple-Choice Questions (Cambridge International A-Level Chemistry): Exam Questions

Shapes of Molecules — Multiple-Choice Questions (Cambridge International A-Level Chemistry): Exam Questions