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2.2 How bonding and structure are related to the properties of substances

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Question 32

A materials scientist investigates two substances, P and Q.

SubstanceDescription of particles and structureMelting point in °C
PAtoms joined to other atoms throughout a repeating network1680
QPositive and negative ions in a regular, repeating lattice1280

Neither substance boils below 2500 °C. Neither substance contains delocalised electrons.

a.

Explain why both P and Q have high melting points.

[4]
b.

The substances are heated to 1500 °C. Explain which substance conducts electricity at this temperature.

[5]
Markscheme

2.2 How bonding and structure are related to the properties of substances Questions

  1. GCSE
  2. /Chemistry
  3. /2.2 How bonding and structure are related to the properties of substances

84 exam-style questions on AQA GCSE Chemistry 2.2 How bonding and structure are related to the properties of substances, covering 2.2.1a The three states of matter, 2.2.1b Limitations of the simple particle model, 2.2.2 State symbols in chemical equations, 2.2.3 Properties of ionic compounds, 2.2.4 Properties of small molecules, 2.2.5 Polymers, 2.2.6 Giant covalent structures, 2.2.7 Properties of metals and alloys, and 2.2.8 Metals as conductors. Each one has a worked solution and a mark scheme showing where the marks go.

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