<p>what is the highest possible score that you can get by leaving 8 blank</p>
<p>750? 10 char</p>
<p>what'd u guys get for one of the t/f ones where
I: in period 3, atomic radius decreases as you move to the right
II: neutrons affect atomic radius</p>
<p>TF? TT?</p>
<p>And are we sure the answer to the long balancing-equation problem with Ag, NO3-, AgNO3, H+... was 1?</p>
<p>One last thing: why is the answer to that "which one would melt most easily" question Fe2O3? FYI SiO2 is quartz, which is a network covalent solid, which has an extremely high melting point</p>
<p>Anyone remember the answer to the TTCE question with 2.4 g of magnesium and 1.6 g of oxygen forming MgO? I can't recall the second part.</p>
<p>it was T T CE but if orgot the exact words</p>
<p>TF and 1, yeah.</p>
<p>I got tf and SiO2</p>
<p>I had kind of a hard time with Chemistry. I skipped 9, missed maybe 4-6.</p>
<p>I'm at 2 wrong so far, the density (32 * 2) question where I carelessly gave the molar mass as 16 and the TTCE about potassium being oxidized (since it doesn't readily gain electrons, it loses them).</p>
<p>Hoping that I didn't make any more thoughtless errors.</p>
<p>does anybody know the answer to "what is the ph of a .01 M solution of (some base, i don't remember what it was)?" I put 12 but i think it may have been neutral b/c of the low concentration. idk</p>
<p>No, it was 12. 10^-2 M NaOH -> 10^-2 M OH- -> 10^-12 M H+. -log(10^-12) = 12.</p>
<p>In general, even extremely low concentrations of strong bases like NaOH significantly raise the pH level.</p>
<p>if it's a base, the ph > 7.</p>
<p>Thank goodness</p>
<p>I am 1000% sure that SiO2 is wrong for that one question. It's quartz, which is a network covalent solid. In Princeton Review it gave this example, and said that the melting points of network covalents are VERY HIGH! Thus it wouldn't melt very easily, which is what the question asked.</p>
<p>What were the other choices? Fe2O3 (rust), CaCO3 (limestone), KCl?
Anyone sure about this question?</p>
<p>I believe it's CaCO3.</p>
<p>That was a tough one. I put sio2 because I had no idea, but yeah it's def wrong.</p>
<p>Actually, now that I think about it I'm not sure. KCl has a slightly lower melting point than CaCO3, but the question is asking for decomposition, not simply melting.</p>
<p>CaCO3 -> CaO + CO2 spontaneously occurs when heat is added.
2KClO3 -> 2KCl + 3O2 does the same.
What about KCl? 2KCl + heat -> 2K + Cl2? I don't know.</p>
<p>Is sulfur associated with acid precipitation?</p>
<p>Yes, it is.</p>
<p>TO xxyyz,</p>
<p>Potassium is OXYDIZED... (oxydize = lose electrons) =P</p>