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ASChemistryCIEExam Questions3. Chemical Bonding3.4 Covalent Bonding & Coordinate (Dative Covalent) Bonding

Covalent Bonding & Coordinate (Dative Covalent) Bonding (CIE AS Chemistry)

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3.4 Covalent Bonding & Coordinate (Dative Covalent) Bonding

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3.4 Covalent Bonding & Coordinate (Dative Covalent) Bonding

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11 mark

Phosphine, PH3, can react with a hydrogen ion, H+, to form the phosphonium ion.

Which type of bond is formed in this reaction?

  • Dipole-dipole forces

  • Dative covalent bond

  • Ionic bond

  • Hydrogen bond

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21 mark

Which of the following contains a dative covalent bond?

  • N2

  • NH3

  • CN-

  • NH4+

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31 mark

Which type of covalent bond is formed by the end-on overlap of atomic orbitals?

  • Sigma bond

  • Pi bond

  • Ionic bond

  • Metallic bond

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11 mark

N2 is a covalently bonded molecule that makes up 78% of gas in the air we breathe.

Which of the following is not present in an N2 molecule?

  • Two lone pairs of electrons

  • Three shared pairs of electrons

  • Three π bonds

  • 180° bond angle

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21 mark

Which diagrams correctly illustrate the formation of a σ bond and a π bond from the overlap of electron orbitals?

1-3-m-5

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    31 mark

    “The bond ....X…. between the hydrogen and halide in HBr is ….Y…. than in Hl.”

    Which pair of words does not correctly complete the sentence above.

     

    X 

    Y

    A

    Length

    Shorter

    B

    Energy

    Greater

    C

    Angle

    Smaller

    D

    Polarity

    Greater

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      41 mark

      Oxygen and nitrogen are consecutive elements in Period 2 and both form diatomic molecules.

      The bond length in the O2 bond is 1.21 A and the bond length in N2 is 1.09A. 

      What best explains the difference in bond length?

      • Oxygen atoms are more electronegative.

      • Nitrogen has more bonding electrons.

      • Nitrogen has a smaller atomic radius.

      • Oxygen bond is stronger.

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      11 mark

      Which is the shortest bond length in the following gases?

      • Oxygen-oxygen in oxygen gas, O2

      • Nitrogen-nitrogen in nitrogen gas, N2

      • Carbon-carbon in ethyne gas, C2H2

      • Oxygen-oxygen in ozone gas, O3

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      21 mark

      Which statement best describes the intramolecular bonding in a carbonate ion, CO32-?

      • Only London forces

      • Electrostatic attraction between pairs of electrons and positively charged nuclei

      • Permanent dipole permanent dipole forces

      • Electrostatic attraction between separate carbonate ions

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      31 mark

      The structure of the NO2 molecule is shown below. 

      screenshot-2024-03-28-121703

      In which compound is the hybridisation of the carbon atom the same as nitrogen atom in NO2?

      • Methane

      • Ethene

      • Ethyne

      • Propane

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