Bonding

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Question 3
Medium

This question is about structure and chemical bonding.

a.

Look at the two structures, A and B, in Fig. 21.1.

Structure A shows a regular arrangement of positive metal ions surrounded by delocalised electrons. Structure B shows a 3D giant ionic lattice of closely packed positive and negative ions.

Fig. 21.1

Identify the bonding in structure A. Explain your answer.

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Explanation: …………………………………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………………………………

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b.

Explain why structure B has a high melting point.

…………………………………………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………………………………………

…………………………………………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………………………………………

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c.

Explain why structure B does not conduct electricity when solid.

…………………………………………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………………………………………

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d.

Look at the structure of hexagonal boron nitride (h-BNh\text{-BN}h-BN) in Fig. 21.2. Hexagonal boron nitride has a slippery feel and is widely used as a high-temperature lubricant.

Fig 21.2 shows the layered structure of hexagonal boron nitride, with sheets of alternating boron and nitrogen atoms in a hexagonal network, held together by weak forces between layers.

Fig. 21.2

Explain why hexagonal boron nitride is slippery.

……………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots……………………………………………………………

……………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots……………………………………………………………

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Bonding Questions

  1. GCSE
  2. /Chemistry
  3. /Bonding