Chemistry, 4.2.2 -Bonding and Structure related to the properties of substances.

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4 Terms

1
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Hydrogen is one example of small covalent molecule.

Explain why hydrogen has a low boiling point. [2 marks]

  • Has a weak intermolecular force.

  • Not require a lot of energy to break the intermolecular force.

2
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Explain why sodium chloride has a high melting point. [3 marks]

  • Giant ionic lattice.

  • Strong electrostatic forces of attraction between oppositely charged ions.

  • large amounts of energy are needed to break the force.

3
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Explain why sodium chloride only conduct electricity when melted or dissolved in water. [2 marks]

  • Ions can move.

  • Carry charges.

4
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Poly(ethene) is a example of polymer.
Explain why poly(ethene) is a solid in room temperature. [4 marks]

  • (Because) Strong intermolecular force of attraction between polymer molecule.

  • (So) Require great deal of energy to break it.

  • (So) High melting points.