ASChemistryOCRExam Questions2. Foundations in ChemistryElectrons, Bonding & Structure

Electrons, Bonding & Structure (OCR AS Chemistry A): Exam Questions

Exam code: H032

3 hours40 questions

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Electrons, Bonding & Structure

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1
1 mark

Which element has a complete outermost sub-shell?

  • Cl

  • Co

  • Mg

  • Si

Choose your answer

2
1 mark

The electron configuration of metal M is 1s22s22p63s2

What is the formula of the compound formed when metal M reacts with oxygen?

  • MO

  • MO2

  • M2O

  • M2O3

Choose your answer

3
1 mark

Which row shows the correct number of electrons that can be held in each of the following?

3rd shell

p sub-shell

p orbital

A

8

2

6

B

8

6

2

C

18

2

6

D

18

6

2

    Choose your answer

    4
    1 mark

    Which electron configuration represents an atom with an atomic number of 36?

    • 1s22s22p63s13p64s24p63d10

    • 1s22s22p63s23p63d104p65s2

    • 1s22s22p63s23p64s23d10

    • 1s22s22p63s23p64s23d104p6

    Choose your answer

    5
    1 mark

    Which sequence shows the correct order of increasing energy for the sub-shells in an atom of iron?

    • 3s 3p 4s 3d

    • 3p 4s 3d 4p

    • 3d 4s 3p 3s

    • 3s 3p 3d 4s

    Choose your answer

    6
    1 mark

    Which compound does not contain ionic bonds?

    • BaCl2

    • CH3OH

    • LiOH

    • MgCO3

    Choose your answer

    7
    1 mark

    Which statement about the electrical conductivity of sodium sulfide is correct?

    • It conducts when solid and when liquid.

    • It conducts when solid but not when liquid

    • It conducts when liquid but not when solid

    • It does not conduct when solid or when liquid.

    Choose your answer

    8
    1 mark

    Which molecule or ion contains a dative covalent bond?

    • CN-

    • N2

    • NH3

    • NH4+

    Choose your answer

    9
    1 mark

    Magnesium oxide has a very high melting point.

    What is the structure and bonding in magnesium oxide?

    • Giant covalent

    • Giant ionic

    • Giant metallic

    • Simple molecular

    Choose your answer

    10
    1 mark

    Which structure does not conduct electricity when solid, has a high melting point, and can conduct electricity when molten?

    • Giant covalent

    • Giant ionic

    • Giant metallic

    • Simple molecular

    Choose your answer

    1
    1 mark

    Which element contains atoms with six unpaired electrons?

    • Argon

    • Carbon

    • Chromium

    • Iron

    Choose your answer

    2
    1 mark

    Which electron configuration represents an ion with an atomic number of 35 and a 1– charge?

    • 1s2 2s2 2p6 3s2 3p6 

    • 1s2 2s2 2p6 3s2 3p5 

    • 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5 

    • 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 

    Choose your answer

    3
    1 mark

    Which compound contains both ionic and covalent bonds?

    • 1,2-dibromoethane, CH2BrCH2Br

    • Calcium chloride, CaCl2 

    • Propanoic acid, CH3CH2COOH

    • Sodium nitrate, NaNO3

    Choose your answer

    4
    1 mark

    The regular arrangement of ions can give a cubic ionic lattice as shown.

    Lattice structure with eight light grey atoms and twelve dark grey atoms

    Which of the following ionic compounds could not be represented using the cubic ionic lattice?

    1. Magnesium oxide

    2. Sodium bromide

    3. Calcium chloride

    • 1, 2 and 3

    • Only 1 and 2

    • Only 2 and 3

    • Only 1

    Choose your answer

    5
    1 mark

    When can sodium chloride conduct electricity?

    Solid

    Molten

    Aqueous

    A

    ✓

    ✓

    X

    B

    ✓

    X

    ✓

    C

    X

    ✓

    ✓

    D

    X

    X

    ✓

      Choose your answer

      6
      1 mark

      Which of the following statements about ions and ionic compounds are true? 

      1.   Nitrogen can form a 3- ion

      2.   Potassium can form a cation

      3.   The formula for aluminium chloride is AlCl2

      • 1, 2 and 3

      • Only 1 and 2

      • Only 2 and 3

      • Only 1

      Choose your answer

      7
      1 mark

      Which statement about bonding is not correct?

      • Covalent bonding is the strong electrostatic attraction between the nuclei of the bonded atoms.

      • A dative covalent bond is a covalent bond where both electrons in the bond come from the same atom.

      • Ionic bonding is the strong electrostatic attraction between oppositely charged particles.

      • Dative covalent bonding requires an electron-deficient compound.

      Choose your answer

      8
      1 mark

      Which element contains atoms with the greatest number of unpaired electrons?

      • Be

      • F

      • Ga

      • Si

      Choose your answer

      9
      1 mark

      Which chemical has the highest melting point?

      • Calcium oxide

      • Lithium

      • Sodium fluoride

      • Sulfur

      Choose your answer

      10
      1 mark

      Which species contain dative covalent bonds?

      1. Al2Cl6 

      2. NH4+ 

      3. NH3BF3

      • 1, 2 and 3

      • Only 1 and 2

      • Only 2 and 3

      • Only 1

      Choose your answer

      1
      1 mark

      How many orbitals are occupied in a silicon atom?

      • 5

      • 7

      • 8

      • 9

      Choose your answer

      2
      1 mark

      Which statement(s) about electron orbitals is/are correct?

      1. Orbitals are filled in order of increasing energy.

      2. An atomic orbital can hold up to two electrons with opposite spins.

      3. For orbitals with the same energy, electrons occupy them singly before pairing.

      • 1, 2 and 3

      • Only 1 and 2

      • Only 2 and 3

      • Only 1

      Choose your answer

      3
      1 mark

      What are the correct electron configurations for V2+ and As3-?

      V2+

      As3-

      A

      1s22s22p63s23p63d14s2

      1s22s22p63s23p63d104s24p6

      B

      1s22s22p63s23p63d14s2

      1s22s22p63s23p63d104s14p6

      C

      1s22s22p63s23p63d3

      1s22s22p63s23p63d104s24p6

      D

      1s22s22p63s23p63d3

      1s22s22p63s23p63d104s14p6

       

        Choose your answer

        4
        1 mark

        Which sequence shows the correct order for the melting points of these metal oxides?

        • MgO > CaO > Na2O

        • MgO > Na2O > CaO

        • Na2O > CaO > MgO

        • Na2O > MgO > CaO

        Choose your answer

        5
        1 mark

        Which statements about boron trichloride (BCl3), aluminium chloride (Al2Cl6), and the product of the reaction between hydrochloric acid and ethylamine is/are correct?

        1. The product of the reaction between hydrochloric acid and ethylamine contains covalent and ionic bonding.

        2. All three species contain an electron deficient atom.

        3. All three species contain a dative covalent bond.

        • 1, 2 and 3

        • Only 1 and 2

        • Only 2 and 3

        • Only 1

        Choose your answer