The oil and vinegar in italian vinegarette separates because the oil is and the vinegar is since it is mostly water. a) nonpolar, polar b) polar, metallic c) homogeneous, ionic d) hydrophyllic, covalent

A polar substance will not dissolve a nonpolar substance. In the case of oil and vinegar, the vinegar is polar and more dense than the oil, so it settles on the bottom of the container. The oil is nonpolar and less dense, so it doesn't dissolve in the vinegar, and it floats on top.

b) that would be the answer based on my text book

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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

c. 75.7

i think that is the right