IB Chemistry SL 2.1 Models of Particulate Nature Question Bank

Practise IB Chemistry SL 2.1 with evidence-led questions on particulate models, bonding, structure and material properties.

Covered syllabus points

2.1.1—Ion formation 2.1.2—Ionic bonding 2.1.3—Ionic compounds

[Maximum number: 1]

How many electrons will be gained or lost when the element with electron configuration $1 s^{2} 2 s^{2} 2 p^{3}$ forms an ionic bond?

Two electrons lost

Two electrons gained

Three electrons lost

Three electrons gained

[Maximum number: 2]

Iron may be extracted from iron (II) sulfide, FeS.

Iron (II) sulfide, FeS , is ionically bonded.

Describe the bonding in this type of solid.

electrostatic attraction between oppositely charged ions/between $\mathrm{Fe}^{2+}$ and $\mathrm{S}^{2-}$

[Maximum number: 3]

Periodic trends enable chemists to predict the behaviour of related compounds.

$\quad \mathrm{Na}_{2} \mathrm{O}$ and $\mathrm{SO}_{3}$ are two oxides of period 3 elements.

$\quad \mathrm{Na}_{2} \mathrm{O}$ does not conduct electricity in the solid state but it does when molten. Pure $\mathrm{SO}_{3}$ does not conduct electricity in either the solid or liquid states. Explain these facts.

$\quad \mathrm{Na}_{2} \mathrm{O}$ ionic and $\mathrm{SO}_{3}$ covalent;
$\mathrm{Na}_{2} \mathrm{O}$ has ions which are free to move in the liquid state;
$\mathrm{SO}_{3}$ has no free charged particles;

Marking guidance:

Accept "no free moving ions"/ "no delocalized electrons".

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Covered syllabus points

2.1 The ionic model question 1

2.1 The ionic model question 2

2.1 The ionic model question 3