IB Chemistry SL 3.1.5 Metal–Non-metal Continuum

Practise tracing the change from metallic to non-metallic behaviour through oxide and hydroxide chemistry. Classify species as basic, amphoteric or acidic from periodic position…

Exam points

rank oxide basicity or acidity across a period from the element's metallic character
predict amphoteric behaviour from periodic position and increasing metallic character
write a balanced equation showing an oxide reacting with water, acid or alkali

[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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3.1.5—Metal/non-metal continuum question 1

Question (a)

Question (i)

Question (ii)