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Which of the following is an example of a physical, rather than a chemical, change?
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If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?
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Which of the following is an example of a physical, rather than a chemical, change?...
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