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Posted by on Monday, January 25, 2010 at 11:01pm.

1.Vapor pressure is the pressure exerted by a vapor when condensation

A. <
B. =
C. >
evaporation over its liquid in a closed system.

2.Evaporation is an

A. endothermic
B. exothermic

process, because when a substance evaporates it must

A. absorb
B. release
energy to(from) its surroundings.

  • chemistry - , Monday, January 25, 2010 at 11:27pm

    Here is the answer to #1.
    http://en.wikipedia.org/wiki/Vapor_pressure

    For #2, can't you reason through this? What must you do to a pot of water to make it evaporate. Do you heat it or cool it? Does that mean it is endothermic or exothermic? Endothermic means it is absorbing heat. Exothermic means it is releasing heat.

  • chemistry - , Sunday, January 31, 2010 at 2:03am

    from UCI!!!!!

    1 is equal bc of equilibrium

    2 is endothermic bc of absorbing heat

    3 is absorb....bc it is endothermic

    yay

    all finish!

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