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The Ionic Model · Paper 1 — Free Chemistry SL Practice Questions

What this topic covers

Every property question IB throws at you — why does this melt higher, why does that conduct here but not there — traces back to one of three bonding models: ionic, covalent, or metallic. This topic asks you to build each model from its electrostatic basics, then use it to predict and explain real behaviour: melting point, conductivity in different states, shape, solubility, malleability. The exam almost never tests the model in isolation — it tests whether you can name the right structural detail (coordination number, electron domain count, number of delocalized electrons) and explain why that detail produces the observed property. Vocabulary without mechanism gets you nowhere on the mark scheme.

Read the full Structure: Models of Bonding and Structure lesson notes →

1FoundationMCQProperties of ionic compounds1 markPaper 1~2 min

Both sodium chloride (NaCl) and magnesium oxide (MgO) adopt the same rock-salt crystal structure. Which statement correctly explains why MgO has a significantly higher melting point than NaCl?

Solutions

2FoundationMCQProperties of ionic compounds1 markPaper 1~2 min

Solid sodium chloride does not conduct electricity, but molten sodium chloride does. Which statement best explains this difference?

Solutions

3FoundationMCQProperties of ionic compounds1 markPaper 1~2 min

A white crystalline solid dissolves in water to give a solution that conducts electricity. The solid has a melting point above 800 °C, and the molten liquid conducts electricity. When struck with a hammer, the solid shatters. Which type of bonding is present in this solid?

Solutions

4MasteryMCQProperties of ionic compounds1 markPaper 1~2 min

Four solid compounds are tested for electrical conductivity. Compound X conducts in the solid state only. Compound Y conducts when molten but not in the solid state. Compound Z does not conduct in either the solid or molten state. Compound W conducts in both the solid and molten states. Which row correctly identifies the bonding in each compound?

Solutions

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