Rubbing alcohol and ethylene glycol (HOCH 2CH 2OH) molecules will have similar London forces, but with two hydroxyl groups, ethylene glycol molecules form twice as many hydrogen bonds as those of 2-propanol, so ethylene glycol is more viscous. Rubbing alcohol molecules (2-propanol) are significantly larger than those of water, so their greater London forces result in a higher viscosity. Each of the first three substances can form hydrogen-bonds. The rate of flow of a liquid depends on the magnitude of the intermolecular forces and the shapes of the molecules. Note: The viscosity of the liquids, not the pipets, is being tested. The narrow point in the pipet is responsible for restriction of liquid flow. ![]() ![]() The associated still images include pictures of the apparatus, labeled samples (from left to right: water, rubbing alcohol, ethylene glycol, vegetable oil), and the tip of pipet.
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