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Unformatted text preview: Questions 1. Accidents: a. Sands molecular formula is SiO 2 . I t is a nonpolar tetrahedral covalently bonded molecule. Compound X is a polar molecule. Therefore sand does not change the intermolecular forces of compound X. This is why the researcher did not need to worry about a few grains of salt. b. This is not a valid assumption. Baking sodas molecular formula is NaHCO 3 . I t is a polar ionic bonded molecule. Therefore the polarity of the molecule do effect the polarity of the compound X molecule. These interactions can change the intermolecular forces, and would change the melting point of the sample. 2. The approximate mole fraction of A:B mixture is 6:4 or 2:8. Both compositions share similar melting point ranges. The only way to tell the exact composition of the sample is to create another mixture of either 6:4 or 2:8 and then mix the sample with this new mixture. If the melting point is depressed then they are not the same composition....
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This note was uploaded on 09/18/2011 for the course CHEM 3AL taught by Professor Li during the Spring '08 term at University of California, Berkeley.
- Spring '08