chem AP

Give a scientific explanation for the following observations. Use equations or diagrams if they are relevant.
A. burning coal containing a significant amount of sulfur leads to "acid rain".
B. Perspiring is a mechanism for cooling the body.
C. At room temperature, NH3 is a gas and H2O is a liquid, even though NH3 has a MM of 17 g/mol and H2O has a MM of 18 g/mol
D. C(graphite) is used as a lubricant, whereas C(diamond) is used as an abrasive.

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  1. for A. is it because the flame reacts with the sulfur in the coal to make acid rain instead of water?

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  2. What you say for A is correct but it misses the point a little. S burns to produce SO2 and SO3 and these gases then react with H2O to form H2SO4.
    For B. Think heat of vaporization of water.
    For C. Think hydrogen bonding.
    For D. Think crystal structure.

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  3. for b.. is it because when something is heated it produces a salt and h2o, so when our body heats up the chemicals in our body let out salt and water, essentially combining to make perspiration. also, it helps to keep a balance in temperature in our body...

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