AP Chemistry Test 2012

<p>Score 2007 2008 2009 2010 2011
5 15.3% 18.4% 18.0% 17.1% 17.0%
4 18.0% 17.5% 17.9% 18.5% 18.4%
3 23.0% 20.0% 20.2% 19.3% 19.5%
2 18.5% 14.3% 14.2% 12.7% 14.6%
1 25.3% 29.9% 29.8% 32.3% 30.4%
Mean 2.79 2.80 2.80 2.76 2.77
Number of Students 97,136 100,586 104,789 115,077 122,651</p>

<p>(From Wikipedia)</p>

<p>For 5 eii, this is what I put: KI is polar, just like all ionic compounds. It will dissolve in H2O because the polar molecules of H2O causes KI to completely break into 2 ions. K+ will be more attracted to the oxygen, while I- will be attracted to the hydrogens. However, according to part d, there is still undissolved I2 solid. That will react with I- to form I3-.
This reaction cannot occur in the hexane layer because hexane is nonpolar, therefore KI wouldn’t dissociate into 2 ions. Therefore [I3-] is larger in H2O than in hexane…
Wouldn’t this be considered true?</p>