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Why is water the only substance that expands when frozen?
Nope. Silicon(Si), Gallium(Ga), Antimony(Sb), Bismuth(Bi) and acetic acid(CH3COOH, vinegar) all expand on freezing as well. Moreover, silicon expands more than water on freezing (10% compared to waters 8%). The trick to this is that any substance with an open tetrahedral molecular structure will also expand upon freezing. (Perhaps phosphorus oxide(s))
If a substance contracts when it freezes?
The vast majority of substances contract upon freezing. The notable exception is water for which the expansion upon freezing has an enormous impact on the nature of the Earth. Most substances contract and become denser upon freezing, but water expands and becomes less dense below about 4 ºC. It is this expansion that causes pipes and bottles to crack when their contents freeze, and rocks to split open when water freezes in their crevices. Icebergs and blocks of ice float in water because they are less dense than the water from which they were frozen. See related links below for more information.
If water was nonpolar?
water would not be able to form hydrogen bonds (wrong)Apex - Water would not rise inside plants :P
Are boiling points of all liquids the same?
All liquids have different boiling point (BP). It's one of the must important characteristics of liquids. You can distinguish and also separate a mixture of liquids by boiling off one with a lower BP. The BP of every liquid depends upon the attractive forces among the atoms or molecules of the material such as hydrogen bonds, dipole attraction, London forces, etc....
What is the difference between the gaseous and liquid state of the same substance?
Liquids and gases both have the property of having no fixed shape, and change their shape depending upon their surrpoundings. Gases, unlike liquids, also have no fixed volume, and readily expand or contract.
