| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Substances that consist of small molecules are usually gases or liquids that have relatively low melting points and boiling points. |
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Substances that consist of small molecules are most commonly which states of matter at room temperature? Students observe samples of simple molecules to deduce their properties and their structure / bonding. |
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The intermolecular forces increase with the size of the molecules, so larger molecules have higher melting and boiling points. |
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How does the size of a molecule affect the size of its intermolecular force? |
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Students must be able to recall the chemical formula and draw the covalent bonding for: water, methane, carbon dioxide and ammonia. |
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These substances have only weak forces between the molecules (intermolecular forces). |
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Explain why substances that consist of small molecules often have low boiling and melting points |
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These substances do not conduct electricity because the molecules do not have an overall electric charge. |
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Why are covalent compounds unable to conduct electricity? |
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It is these intermolecular forces that are overcome, not the covalent bonds, when the substance melts or boils. |
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What is the difference between intermolecular forces and intramolecular forces? |
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Students should be able to use the idea that intermolecular forces are weak compared with covalent bonds to explain the bulk properties of molecular substances. |
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Which is stronger: A covalent bond or intermolecular force? |
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