Melting Point Trend (AQA A-Level Chemistry): Quizzes

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Melting Point Trend
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Which structure types have high melting points in Period 3 oxides?

Giant ionic or giant covalent

What type of structure do Na2O\text{Na}_2\text{O}, MgO\text{MgO}, and Al2O3\text{Al}_2\text{O}_3 have?

Giant ionic

Why does MgO\text{MgO} have a higher melting point than Na2O\text{Na}_2\text{O}?

Mg2+\text{Mg}^{2+} has higher charge density

Why does Al2O3\text{Al}_2\text{O}_3 have a lower melting point than MgO\text{MgO}?

It has some covalent character

What type of structure does SiO2\text{SiO}_2 have?

Giant covalent

Why does SiO2\text{SiO}_2 have a high melting point?

Strong covalent bonds throughout

What type of structure do P4O10\text{P}_4\text{O}_{10} and SO3\text{SO}_3 have?

Simple molecular

What forces hold simple molecular oxide structures together?

Weak intermolecular forces

Why does P4O10\text{P}_4\text{O}_{10} have a higher melting point than SO3\text{SO}_3?

Stronger van der Waals forces

Which Period 3 oxide has the highest melting point?

SiO2\text{SiO}_2

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