which of the two expand mere, water and benzene
Answers
Explanation:
The space between the molecules is filled with air, so that the ice floats. The increase in distance between the water molecules is the expansion of water. ... So in benzene there are more molecules in the solid than in the same volume of liquid. Solid benzene is more dense than the liquid.
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Answer:
Most people know that solid water, ice, floats. Icebergs float in the ocean, the surface of ponds freezes in winter, and ice cubes float in your drink. Why? Because as water freezes, the molecules arrange themselves in an orderly fashion to make a grid of molecules held together by hydrogen bonds between the molecules. These hydrogen bonds force the molecules to be farther away from each other in the solid than in the liquid. This means that in a certain measured space there will be fewer solid water molecules than there would be liquid water molecules. The space between the molecules is filled with air, so that the ice floats. The increase in distance between the water molecules is the expansion of water. Ice is less dense than liquid water.
Benzene, on the other hand, does not form hydrogen bonds. The molecules of benzene are very flat discs, and as benzene freezes, the molecules actually end up closer together, stacked upon each other in what is known as pi to pi stacking (because of all its delocalized pi electrons in its structure.) So in benzene there are more molecules in the solid than in the same volume of liquid. Solid benzene is more dense than the liquid. So not only doesn't it expand; it contracts as it freezes.
Clearly water expands more than benzene as they go from liquid to solid.