- #1
Shackleford
- 1,656
- 2
See link.
http://ls1tech.com/forums/attachment.php?attachmentid=138166&d=1214890282
http://ls1tech.com/forums/attachment.php?attachmentid=138166&d=1214890282
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Borek said:Just skimmed - mostly OK, but at least one obvious error.
Borek said:Sorry, you will not get it from me, unless you are ready to split your grade
chemisttree said:Well, for starters, one of your answers in 1) is wrong...
Borek said:Does CaO dissolve in water?
What is boiling? When does the liquid boil and why?
The boiling point is when the vapor pressure equals or exceeds the atmospheric pressure.
Borek said:I never told there is CaO in number one, I just asked whether CaO dissolves in water. If CaO doesn't suit you, you may answer question about Na2 solubility.
That's correct. Now, why does the boiling point go up when you dissolve some substance?
Shackleford said:I would say CaO does dissolve in water. It's an ionic compound, and they require a polar molecule in which to dissolve. A water molecule is polar.
The boiling point goes up because the vapor pressure is lowered. It requires more energy input to extract the molecules from the solution.
Borek said:No, this is chemistry, sometimes instead of dissolving things react or don't react.
Correct. What will happen to the vapor pressure when you dissolve more substance?
Borek said:You were given many hints. Have you checked what happens to CaO in water? Have you checked what is the chemistry of the only oxide present on the question sheet? Have you checked answers that deal with the changes in boiling point or vapor pressure?
Shackleford said:I don't see that one is wrong. Molecules with similar intermolecular forces will dissolve each other. Ionic compounds require polar molecules to dissolve. As far as I can tell, my answers reflect that. I also looked over the rest and didn't catch any error. I'll need a little more than there's just one wrong.
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