SAT II Chem Questions...HELP :P

Test Preparation SAT Subject Test Preparation
1

<p>First of all.....85 questions in 60 minutes?? And what's up with the curve...-2 is an 800 but on math II and physics nearly -10 is an 800. Is this test like very very easy?</p>

<p>I went onto the collegeboard's website and did some Chem practice questions they gave and I did good on pretty much everything except the T/F/CE questions. Any stratagies?</p>

<p>Also, do the questions get harder as it goes on?</p>

<p>I took honors chem last year and took AP Chem this year. Should I be fine?</p>

<p>Finally, can yall help me with some questions that I missed? :D</p>

<p>The combustian of fuels containing sulfer leads to the production of acid rain......BECAUSE........sulfer oxides from acid solutions in water</p>

<p>I know statement 2 is true but when I think of combustion I think CxHy (or in this case SxHy)</p>

<p>The rate at which sugar dissolves in water increases with stirring.......BECAUSE.........stirring exposes the surface of a solute srystal to a less concentarted layer of solution</p>

<p>Zinc metal will reduce Cu2+ in solution......BECAUSE........zinc is a more active metal than copper is</p>

<p>Do I just have to make up a reaction to tell wheather statement 1 is true? Totally confused on statement 2 :(</p>

<p>Multiple Choice:</p>

<p>To determine whether a water solution of Na2S2O3 at room temp is supersaturated (???), one can</p>

<p>A. Heat the solution to its boiling point
B. Add water to the solution
C. Add a crystal of Na2S2O3 to the solution
D. Acidify the solution
E. Cool the solution to its freezing point</p>

<p>From their electron configs, one can predict that the geometric configuration for which of the following molecules is NOT correct</p>

<p>A. PF3...Trigonal Planar
B. CF4...Tetrahedral
C. CHCl3...Irregular tetrahedorn (??)
D. OF2...Bent (V-shaped)
E. HF...Linear </p>

<p>I know how to this this by drawing them all out, but with 85 questions in 60 minutes this will be a huge waste of time. Is there a quicker way?</p>

<p>Thanks guys! :D</p>

2

<p>Please help me :'(</p>

3

<p>I would like start of by saying I’m not the best at the T/F ones :stuck_out_tongue:

  1. T T CE, I’m not sure how to explain that but I’m pretty sure that’s what happens.
  2. T T CE, I know S1 is true S2 sounds true and if it is true it would be a good explanation for S1 so CE.
  3. T T CE, Look at these websites: [Reactivity</a> series - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Reactivity_series]Reactivity”>Reactivity series - Wikipedia) and <a href=“http://en.wikipedia.org/wiki/Standard_electrode_potential_(data_page[/url])”>http://en.wikipedia.org/wiki/Standard_electrode_potential_(data_page)&lt;/a&gt;&lt;/p&gt;

<ol>
<li>Supersaturated refers to Ksp and more than the maximum number of ions has been reached. This is done by heating the solution allowing more ions to dissolve. I think the answer is C.</li>
<li>A, B, and E are obviously correct because they are easy just to think of in your head. I really don’t feel like drawing out OF2, but if I’m thinking of it correctly its 2 shared pairs 2 unshaired pairs, so it is bent. Also, if I’m picturing CHCl3 correctly it should be tetrahedral. I am not sure what the irregular thing is. I would choose C.</li>
</ol>

4

<p>The irregular one is A.
PF3 is trigonal pyramidal because of the lone pair on P.</p>

5

<p>^Ya that’s right, I read it as trigonal pyramidal >_< and not trigonal planar which is 3 sp 0 usp.</p>

6

<p>Can yall please explain though, I already have the answers :'(</p>

<p>They are from the collegeboard’s website</p>

7

<p>4 is C because, if a solution is supersaturated and you add a crystal, you’ll be able to see the entire thing recrystallize (because you were basically forcing more solute in than needed).</p>