Unit 2: Structure 2: Models of Bonding and Structure
Topic 2.1: The Ionic Model Questions
Practice 20 exam-style questions for IB Chemistry Topic 2.1. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Deduce1 mark
Deduce the formula of the ionic compound formed between potassium ions, K⁺, and sulfide ions, S²⁻. [1]
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An atom of element Q has the electron configuration 2, 8, 8, 1.
Deduce the formula of the ion that Q usually forms, and explain your reasoning. [2]
Deduce the formula of the ion that Q usually forms, and explain your reasoning. [2]
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Name the compounds MgSO₄, Fe(NO₃)₃ and CuCl₂.
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Deduce the formula of ammonium sulfate and explain why brackets are needed.
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State the charge on each of the following ions: nitrate, carbonate, phosphate and hydroxide.
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Explain how a sodium atom and a chlorine atom form ions, and state the charge on each ion.
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Define ionic bonding and explain why ionic compounds have high melting points.
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Explain why the melting point of magnesium oxide is much higher than that of sodium chloride.
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Deduce the charge on the ion formed by an element in group 2 and by an element in group 16, explaining your reasoning.
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Describe the structure of an ionic lattice, using sodium chloride as an example.
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Explain why ionic compounds conduct electricity when molten or in solution but not when solid.
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Explain what is meant by lattice enthalpy and state two factors that determine its magnitude.
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Explain why many ionic compounds dissolve in water but not in hexane.
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Deduce the formula of the ionic compounds formed between magnesium and chlorine, and between aluminium and oxygen.
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Sodium chloride is an ionic compound.
Explain why it has a high melting point and why it conducts electricity when molten but not when solid. [3]
Explain why it has a high melting point and why it conducts electricity when molten but not when solid. [3]
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Deduce the formula of iron(III) hydroxide, formed from Fe³⁺ ions and hydroxide ions, OH⁻. [1]
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Explain why an ionic crystal such as sodium chloride is brittle and shatters when it is hit. [2]
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2026
What is the formula of the ion formed by an atom of aluminium?
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Why does sodium chloride have a high melting point?
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What is the formula of magnesium nitrate?
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