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The Covalent 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 →

1FoundationMCQCovalent bonding and electron sharing1 markPaper 1~2 min

In a

\text{Cl}_2

molecule, each chlorine atom forms one single covalent bond. How many electrons are counted in the valence shell of each chlorine atom, and what principle does this illustrate?

Solutions

2FoundationMCQCovalent bonding and electron sharing1 markPaper 1~2 min

In ethene (

\text{C}_2\text{H}_4

), the carbon-carbon double bond consists of one

\sigma

bond and one

\pi

bond. Which statement correctly describes the

\pi

bond?

Solutions

3FoundationMCQCovalent bonding and electron sharing1 markPaper 1~2 min

Which of the following correctly states the number of electrons shared in the bonds of

\text{N}_2

(triple bond) and

\text{O}_2

(double bond)?

Solutions

4MasteryMCQCovalent bonding and electron sharing1 markPaper 1~2 min

Phosphorus pentachloride,

\text{PCl}_5

, has a Lewis structure in which phosphorus forms five single covalent bonds, giving it 10 electrons in its valence shell. Which statement best explains why this Lewis structure is acceptable?

Solutions

Questions 5-130

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