IB Chemistry SL 3.1.5 Metal–non-metal continuum Question Bank

Practise IB Chemistry SL 3.1.5 by relating metallic character to oxide properties and acid–base behaviour across a period.

Exam points

Classify an element or oxide as metallic, non-metallic, amphoteric or intermediate from periodic position.
Write equations showing how acidic or basic oxides react with water.
Use oxide and solution evidence to compare metallic character across a period.

[Maximum number: 3]

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

(a)

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

[ 3 ]

(i)

State the acid-base natures of $\mathrm{Na}_{2} \mathrm{O}$ and $\mathrm{SO}_{3}$ .

[ 1 ]

$\quad \mathrm{Na}_{2} \mathrm{O}$ basic and $\mathrm{SO}_{3}$ acidic;

Marking guidance:

Ignore state symbols.

(ii)

State equations for the reactions of $\mathrm{Na}_{2} \mathrm{O}$ and $\mathrm{SO}_{3}$ with water.

[ 2 ]

$\ce{Na2O}$ + $\ce{H2O}$ -> 2 $\ce{NaOH}$ ; $\ce{SO3}$ + $\ce{H2O}$ -> $\ce{H2SO4}$ . State symbols may be ignored.

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