12.17 (1)

12.17 (1) - crystal with the C atoms joined in an endless...

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Which of the following is most likely to dissolve in water? a. methane b. C 10 H 20 (an alkene) c. C 3 H 7 OH d. graphite e. benzene f. gold Remember the general rule of thumb for solubility: like dissolves like. Water is a polar solvent that can participate in H-bonds. So we ought to look for similar solutes. That requires knowing the structure of each compound listed. Methane is CH 4 , has a tetrahedral shape, and is non-polar—not a good candidate. The next compound is an alcohol. The OH group on the end is polar and can participate in H-bonds—that makes it a good candidate. Graphite is a form of the element carbon and is a network covalent
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Unformatted text preview: crystal, with the C atoms joined in an endless network. It is therefore non-polar and a poor candidate—you probably know that pencil lead, which contains graphite, and soot from fires is not very soluble in water (especially if you’ve ever tried to wash soot out of your tee-shirt. Benzene is a ring-shaped unsaturated hydrocarbon, non-polar—not a good candidate. And finally, gold is a metal which neither dissolves with or reacts with water, as anyone who has lived for very long on this planet knows well. Therefore, the best choice is the alcohol....
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