ASChemistryCambridge (CIE)Exam Questions9. The Periodic Table: Chemical PeriodicityPeriodicity of Physical Properties of the Elements in Period 3

Periodicity of Physical Properties of the Elements in Period 3 (Cambridge (CIE) AS Chemistry): Exam Questions

Exam code: 9701

51 mins14 questions

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Periodicity of Physical Properties of the Elements in Period 3

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1
1 mark

Which row compares the ionic radius and atomic radius of sodium and sulfur?

ionic radius

atomic radius

A

Na+ < S2-

Na < S

B

Na+ < S2-

Na > S

C

Na+ > S2-

Na > S

D

Na+ > S2-

Na < S

    Choose your answer

    2
    1 mark

    The trends in three physical properties of the elements of Period 3 are shown in the graphs.

    Three graphs showing trends in physical properties of Period 3 elements: melting point, first ionisation energy, and atomic radius

    Which physical property is not shown?

    • Electrical conductivity

    • Atomic radius

    • Melting point

    • First ionisation energy

    Choose your answer

    3
    1 mark

    Which graph shows the electronegativity of the elements Na, Mg, Al and Si, from Period 3, plotted against their first ionisation energies?

    • Graph showing electronegativity plotted against first ionisation energy for Na, Mg, Al, and Si from Period 3. Both electronegativity and first ionisation energy increase from Na to Si, with a lower first ionisation energy at Al than Mg
    • Incorrect graph of electronegativity against first ionisation energy for Na, Mg, Al and Si
    • Incorrect graph of electronegativity against first ionisation energy for Na, Mg, Al and Si
    • Incorrect graph of electronegativity against first ionisation energy for Na, Mg, Al and Si

    Choose your answer

    1
    1 mark

    Consecutive elements X, Y and Z are in Period 3. Element Y has the highest first ionisation energy and the lowest melting point of these three elements.

    Which row identifies elements X, Y and Z?

    • silicon, phosphorus, sulfur

    • sodium, magnesium, aluminium

    • aluminium, silicon, phosphorus

    • magnesium, aluminium, silicon

    Choose your answer

    2
    1 mark

    Which row correctly describes the physical properties of the substance?

    substance

    melting point

    conductivity of solid

    conductivity when added to water

    A

    Al

    high

    good

    good

    B

    NaCl

    high

    good

    good

    C

    SiO2

    high

    poor

    good

    D

    SO3

    low

    poor

    good

    • Al

    Choose your answer

    3
    1 mark

    Which metal has the highest melting point?

    • Na

    • Mg

    • K

    • Al

    Choose your answer

    4
    1 mark

    The graph shows the values of log ionisation energy for the first eight ionisation energies of an element X from Period 3.

    Graph showing log10 of ionisation energy in kJ/mol against number of electrons removed, with a sharp increase after the sixth electron

    Which statement about element X is correct?

    • it reacts with excess hot NaOH (aq) to produce hydrogen gas

    • its highest oxidation state in a compound is +6

    • it forms a giant covalent oxide that is insoluble in water

    • its first ionisation energy is higher than that of the element immediately to its right in the Periodic Table

    Choose your answer

    1
    1 mark

    A student investigated the chloride of a Period 3 element and made the following observations:

    • The compound was a white crystalline solid.

    • It dissolved easily in water to give a solution of pH 12.

    • When placed in a test-tube and heated in a roaring Bunsen flame, the compound melted after several minutes of heating.

    What can be deduced from these observations?

    • At least one of the recorded observations is incorrect

    • The compound is sodium chloride, NaCl

    • The compound is silicon tetrachloride, SiCl4

    • The compound is phosphorus pentachloride, PCl5

    Choose your answer

    2
    1 mark

    Which element has the third lowest first ionisation energy in its period and the third smallest atomic radius in its group?

    • magnesium

    • boron

    • sodium

    • calcium

    Choose your answer

    3
    1 mark

    Which row describes a substance with a giant covalent structure?

    conductivity of solid

    MP / K

    BP / K

    A

    poor

    388

    718

    B

    good

    923

    1363

    C

    good

    3031

    2943

    D

    poor

    1986

    2950

      Choose your answer