June 2006 - Chemistry

<p>An NaCl solution has a lower freezing point than water BECAUSE NaCl has a greater molar mass than water</p>

<p>I got F/T because it said NaCl solution and not NaCl aqueous solution, anybody else agree?</p>

<p>Doesn't NaCl solution imply an aqueous solution (since no other solvent was stated)?</p>

<p>lol. jyankees that doesnt' matter.</p>

<p>NaCl solution has a lower freezing point --> that's why they put salt on ice to melt it..</p>

<p>that's because of the bonding, not because of the molar mass.. therefore it's T/F</p>

<p>For 2, it was highest melting point. Would that still be NaF? I put NaAt =(. Anyone care to explain?</p>

<p>Guys </p>

<p>1.5 atm X 8 L X 100 K = 200 K X .75 atm * V 2
1200 = 200 X .75 * v2
6 = .75 X V2</p>

<p>8 = V2</p>

<p>P1V1/T1 = P2V2/T2.</p>

<p>There is your proof.</p>

<p>IT has to do with their electronegativies. F has the greatest electronegativity.</p>

<p>The rxn coordinate was F- T</p>

<p>IT is exothermic, hence the energy of the reactants is greater than the energy of hte products.</p>

<p>NaCl solution doesn't imply aqueous solution does it? I figured NaCl solution meant liquid NaCl...and therefore it would have a MUCH higher freezing
point than water</p>

<p>You're supposed to assume an aqeous solution when it states solution unless it specifically states it isn't an aqeuous sol'n.</p>

<p>really? that sucks, how do they talk about a solution of NaCl liquid then (yes, I realize that would be a very rare thing to talk about)</p>

<p>I donno. Molten Nacl?</p>

<p>You wouldn't say a "solution" of NaCl liquid... it would be called molten NaCl.</p>

<p>so then that question would have been T/T?</p>

<p>Dk-blue falcon, HF doesn't have the highest melting point,
The bigger the salt is, the strong the london dispersion forces.</p>

<p>Look the values up yourself, just type in NaF + Boiling point and some other sodium halide that has 1 more e- orbital..</p>

<p>Well, i donno then=/ I just took an educated guess.</p>

<p>ok queston... do the west coast and east coast take the same test? if they do.. how do they stop people from calling their friends from CA and cheating? </p>

<p>j/w lol</p>

<p>and question on the chemistry: was allotropes the awnser to like 2 of them?</p>

<p>I got put 02 and 03 were allotropes--that's one.</p>

<p>ok good me too</p>

<p><a href="http://www.saltinstitute.org/15.html%5B/url%5D"&gt;http://www.saltinstitute.org/15.html&lt;/a>
<a href="http://www.webelements.com/webelements/compounds/text/Na/Br1Na1-7647156.html%5B/url%5D"&gt;http://www.webelements.com/webelements/compounds/text/Na/Br1Na1-7647156.html&lt;/a&gt;&lt;/p>

<p>NaCl has a higher melting point than NaBr...so NaF DOES have the highest melting point</p>

<p>what was the awnser to the question about vaporizing somehting?</p>