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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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11 mark

Which of the following elements has a complete outermost sub-shell?

  • Mg

  • Si

  • Co

  • Cl

Choose your answer

21 mark

The electron configuration of metal M is 1s22s22p63s2

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

  • MO

  • MO2

  • M2O

  • M2O3

Choose your answer

31 mark

Which 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

    41 mark

    Which of the following is the electron configuration of an atom with an atomic number of 36?

    • 1s22s22p63s13p64s24p63d10

    • 1s22s22p63s23p63d104p65s2

    • 1s22s22p63s23p64s23d10

    • 1s22s22p63s23p64s23d104p6

    Choose your answer

    51 mark

    What is the correct sequence for the orbitals shown in an atom of iron in order of increasing energy?

    • 3s 3p 4s 3d

    • 3p 4s 3d 4p

    • 3d 4s 3p 3s

    • 3s 3p 3d 4s

    Choose your answer

    61 mark

    Which of the following compounds is not bonded ionically?

    • CH3OH

    • MgCO3

    • LiOH

    • BaCl2

    Choose your answer

    71 mark

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

    • It conducts when solid and liquid

    • It conducts when solid but not when liquid

    • It conducts when liquid but not when solid

    • It does not conduct when liquid or solid

    Choose your answer

    81 mark

    Which of the following contains a dative covalent bond?

    • N2

    • NH3

    • CN-

    • NH4+

    Choose your answer

    91 mark

    Magnesium oxide has a very high melting temperature.

    Which of the following is the best description of its structure and bonding?

    • Giant ionic

    • Giant metallic

    • Macromolecular

    • Simple molecular

    Choose your answer

    101 mark

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

    • Giant metallic

    • Giant ionic

    • Macromolecular

    • Simple molecular

    Choose your answer

    11 mark

    Atoms of an unknown element contain six unpaired electrons.

    What could the unknown element be?

    • Argon

    • Carbon

    • Chromium

    • Iron

    Choose your answer

    21 mark

    What is the electronic configuration of the ion with a single negative charge and the atomic number 35?

    • 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

    31 mark

    Which of the following compounds has both covalent and ionic bonds?

    • Calcium chloride, CaCl2 

    • Sodium nitrate, NaNO3

    • Propanoic acid, CH3CH2COOH

    • 1,2-dibromoethane, CH2BrCH2Br

    Choose your answer

    41 mark

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

    calcium-chloride-lattice

    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

    51 mark

    When can sodium chloride conduct electricity?

     

    Solid

    Molten

    Aqueous

    A

    ✓

    ✓

    X

    B

    ✓

    X

    ✓

    C

    X

    ✓

    ✓

    D

    X

    X

    ✓

      Choose your answer

      61 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

      71 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

      81 mark

      Which element has the greatest number of singly occupied orbitals?

      • Si

      • F

      • Be

      • Ga

      Choose your answer

      91 mark

      Which chemical has the highest melting point?

      • Sulfur

      • Calcium oxide

      • Lithium

      • Sodium fluoride

      Choose your answer

      101 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

      11 mark

      How many orbitals are occupied in a silicon atom?

      • 5

      • 7

      • 8

      • 9

      Choose your answer

      21 mark

      Which of the following statements about electrons filling orbitals is/are correct?

      1. Electrons follow Aufbau’s principle because it is energetically more stable.

      2. Electrons follow the Pauli Exclusion principle because the energy needed to jump to the next higher empty orbital is more than the spin-pair repulsion.

      3. Electrons that individually occupy orbitals must have the same spin to minimize repulsion.

      • 1, 2 and 3

      • Only 1 and 2

      • Only 2 and 3

      • Only 1

      Choose your answer

      31 mark

      What are the electron configurations of V2+ and As3- respectively?

      A

      1s22s22p63s23p63d14s2

      1s22s22p63s23p63d104s24p6

      B

      1s22s22p63s23p63d14s2

      1s22s22p63s23p63d104s14p6

      C

      1s22s22p63s23p63d3

      1s22s22p63s23p63d104s24p6

      D

      1s22s22p63s23p63d3

      1s22s22p63s23p63d104s14p6

       

        Choose your answer

        41 mark

        What is the correct order for the melting points of the following metal oxides?

        • Na2O > MgO > CaO

        • MgO > CaO > Na2O

        • MgO > Na2O > CaO

        • Na2O > CaO > MgO

        Choose your answer

        51 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