IB Chemistry HL 3.1.5 Metal Non Metal Continuum Questions

Use real exam questions to analyse oxide bonding and acid-base trends, then justify equations, pH and amphoteric predictions.

Exam points

Deduce and write balanced equations for Group 1, Group 2, carbon or sulfur oxide reactions with water, including products and aqueous acid/base species.
Analyse the change from basic through amphoteric to acidic oxides across period 3 and justify it with bonding, pH and acid-base evidence.
Evaluate or predict an oxide’s acid-base behaviour, water reaction or amphoteric response from its formula and periodic position, citing the required chemical evidence.

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Study 3.1.5—Metal/non-metal continuum conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 3]

Magnesium is a group 2 metal which exists as a number of isotopes and forms many compounds.

(a)

Magnesium burns in air to form a white compound, magnesium oxide. Formulate an equation for the reaction of magnesium oxide with water.

[ 1 ]

$\mathrm{MgO}(s)+\mathrm{H}_{2}\mathrm{O}(l) \rightarrow \mathrm{Mg(OH)}_{2}(s)$

or:
$\mathrm{MgO}(s)+\mathrm{H}_{2}\mathrm{O}(l) \rightarrow \mathrm{Mg}^{2+}(aq)+2\mathrm{OH}^{-}(aq)$

(b)

Describe the trend in acid-base properties of the oxides of period 3, sodium to chlorine.

[ 2 ]

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IB Chemistry HL 3.1.5 Metal Non Metal Continuum Questions question 1

Question (a)

Question (b)