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Thread: About some hard question

  1. #1 About some hard question 
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    When the vapor pressure of a liquid same as the atmosphere pressure,the liquid will boils.It must heat up the temperature to do this.
    Can anybody explain why the liquid same as atmosphere pressure,the liquid will boil?Why heat up will add the vapor pressure?
    Vapor pressure is the pressure of the gaseous state of liquid.But...the gaseous state of the liquid will blown away by wind..or move itself...So,the vapor pressure will always same?



    If add impurity to liquid..why it will change its density,freezing point and boiling point????????

    I have searched from website..i am not very understand..Can you explain to me?(Use simple word..thank you..)h\


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  3. #2  
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    Please help me.......


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  4. #3  
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    At the vapor pressure the liquid will boil because at this temperature and pressure the internal (heat) energy is just sufficient to cause equilibrium between the weak interactions binding the molecules together to hold liquid form.

    You must add more heat to break or overcome the interactions so that the molecules are in gas form and free of each other.
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  5. #4  
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    why add impurity will increase the density of liquid,raise the boiling point,lowerthe freezing point..?
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  6. #5  
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    pls help me
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