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CAIE A-Level Chemistry AS 3.4 Covalent Bonding and Coordinate Dative Covalent Bonding Questions

Practise electron-pair bonding, orbital overlap and coordinate-bond formation across simple and expanded-octet species.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • define covalent bonding through attraction between two nuclei and a shared electron pair
  • identify coordinate bonding when both electrons in the shared pair originate from one atom
  • describe multiple bonds as one sigma bond plus one or two pi bonds formed by orbital overlap

Covered syllabus points

3.4.1—Covalent bonding examples3.4.2—Sigma and pi bonds3.4.3—Terms

Question 1

[Maximum number: 1]

When solid aluminium chloride is heated, Al2Cl6\mathrm{Al}_{2} \mathrm{C} l_{6} is formed.
Which bonding is present in Al2Cl6\mathrm{Al}_{2} \mathrm{Cl}_{6} ?

A

covalent and coordinate (dative covalent)

B

covalent only

C

ionic and coordinate (dative covalent)

D

ionic only

Question 2

[Maximum number: 1]

Which feature is present in both ethene and poly(ethene)?

A

bond angles of 109.5∘109.5^{\circ}

B

π\pi covalent bonds

C

σ\sigma covalent bonds

D

sp3\mathrm{sp}^{3} orbitals

Question 3

[Maximum number: 1]

Which equation represents an enthalpy change that is the average bond energy of the C-H bond in methane?

A

14C(g)+H(g)→14CH4( g)\frac{1}{4} \mathrm{C}(\mathrm{g})+\mathrm{H}(\mathrm{g}) \rightarrow \frac{1}{4} \mathrm{CH}_{4}(\mathrm{~g})

B

14CH4( g)→14C(g)+H(g)\frac{1}{4} \mathrm{CH}_{4}(\mathrm{~g}) \rightarrow \frac{1}{4} \mathrm{C}(\mathrm{g})+\mathrm{H}(\mathrm{g})

C

CH4( g)→C(g)+4H(g)\mathrm{CH}_{4}(\mathrm{~g}) \rightarrow \mathrm{C}(\mathrm{g})+4 \mathrm{H}(\mathrm{g})

D

CH4( g)→CH3( g)+H(g)\mathrm{CH}_{4}(\mathrm{~g}) \rightarrow \mathrm{CH}_{3}(\mathrm{~g})+\mathrm{H}(\mathrm{g})

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