How are the atoms within a molecule held together?
By stron covalent bonds.
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Why do simple molecules have little attraction for each other?
Because the covalent bonds act only between the atoms within the molecule.
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What are the properties of substances made of simple molecules?
They have low melting and boiling points; they do not conduct electricity.
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Why don't simple molecules conduct electricity?
Because molecules have no overall charge and so cannot carry electrical charge.
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Why do substances made of simple molecules have low melting points and boiling points?
Because of the weak intermolecular forces between simple molecules.
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What are he forces of attraction between molecules called?
Intermolecular forces.
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How are intermolecular forces overcome?
When a molecular substance melts or boils.
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What substances have the weakest intermolecular forces?
Those with the smallest molecules, like H_2, Cl_2 and CH_4, have really weak intermolecular forces and are gases at room temperature.
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What substances have the strongest intermolecular forces?
Larger molecules have stronger attractions and so may be liquids at room temperature, like Br_2 and C_6H_14, or solids with low melting points, like I_2.
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Why does petrol not conduct electricity?
The molecules in petrol have no overall charge.
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Why are substances with large molecules more likely to be liquids or solids at room temperature?
The intermolecular forces are greater for larger molecules.
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Other cards in this set
Card 2
Front
Why do simple molecules have little attraction for each other?
Back
Because the covalent bonds act only between the atoms within the molecule.
Card 3
Front
What are the properties of substances made of simple molecules?
Back
Card 4
Front
Why don't simple molecules conduct electricity?
Back
Card 5
Front
Why do substances made of simple molecules have low melting points and boiling points?
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