SME
Grade 10 Science · Problem type
Polar or nonpolar molecule?
Use this for “Is carbon tetrachloride polar, even though its bonds are?”
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Is the molecule polar?
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Assumptions
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Polar bonds in a symmetric shape cancel.
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A lone pair on the central atom, or different outer atoms, usually leaves a net dipole.
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Molecular shape, polarity and intermolecular forces
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The strongest attraction between molecules
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Molecular shape, polarity and intermolecular forces
Main lesson
The strongest attraction between molecules
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Why ice floats
Use this for “Why does ice float on liquid water?”, “How many hydrogen bonds can one water molecule make?” or “Why does water dissolve salt?”