<p>"However, if a strong base is used to titrate a weak acid, the pH at the equivalence point will not be 7." </p>
<p>Taken from sparknotes.com. Since we can assume that the opposite (weak base + strong acid does also not have an equivalence point of 7), and the graph DID in fact have an equivalence point of 7, I think that proves that it was not weak base but rather strong base.</p>
<p>the endothermic one.....sublimate: To transform directly from the solid to the gaseous state or from the gaseous to the solid state without becoming a liquid.....it wouldn't be endothermic if it's going from gas to solid</p>
<p>Anyone figure out which compound would be produced if Mg, Ag and NO3 reacted? I am not sure if those were the exact elements, does anyone remember?</p>
<p>I believe the question was what are the products when these substances react: Mg, Ag+ and NO3-.</p>
<p>This is a redox reaction. So the products are Mg2+, Ag and NO3-.</p>
<p>"The question is which would make an acidic solution if it was put into water.</p>
<p>SO3 is a nonmetal oxide, which is an acid anhydride and forms acid in water. Thus, it would create an acidic solution"</p>
<p>Accel had the right answer I believe, which was also my reasoning</p>
<p>What did everyone put for the cooling curve? Like the greatest potential energy released?</p>
<p>it was C wasnt it?</p>
<p>Cooling Curve was the longest horizontal distance</p>
<p>For the titration curve, I put strong base...if you looked at the pH before any HCl was added, the pH was 13...wouldn't that make it a strong base? I didn't think that you could titrate a strong acid with a weak acid?...</p>
<p>for the titration, the reason is NOT Becasue of molarities. BOTH ARE STRONG. one of them had 2 H's and the base gave only 1 OH... you can't titrate a strong acid with a WEAK base anyways. only with strong.</p>
<p>
[quote]
one question askeed which would make an (basic) solution by adding water?
I. Ag
II. something
III. HSO3
[/quote]
answer is II and III.. hopefully remembers what the "soemthing" is.. MgO, i believe.. MgO reacts weaker with water, but still forms OH, i believe, just not the H2 that alkaline metals form </p>
<p>for the barometer question, with one side really high and the other side really low, what did you get as the pressure of gas?
my answer was High # minus Low # minus 750torr, or something like that.. ended up with 150?</p>
<p>other random things:
1) i got .5 for something
2) .05 for something else and i think that number was included in the question
3) did that equation make Mg+ and Ag? but not NO?
4) what was that question that asks about which statement about the periodic table is not true? was it one that each group had either metal or nonmetal?
5) radioctive - is it radon? and sun is something about He?
6) i put strong base for the HCL titration curve, was panicking so noticed nothing but the fact that the equivalence point was 7.
7) what was that thing about carbonide..</p>
<p>"4) what was that question that asks about which statement about the periodic table is not true? was it one that each group had either metal or nonmetal?
5) radioctive - is it radon? and sun is something about He?
6) i put strong base for the HCL titration curve, was panicking so noticed nothing but the fact that the equivalence point was 7."</p>
<p>4- yes
5- correct
6- i put strong base as well because the starting pH was 12.something and that indicates a strong base.</p>
<p>the fact that the pH was 12 has no correspondence to the fact that its a strong base. Molarity of a base determines the pH. Sure strong Bases fully ionize but high concentrations of weak bases can have a high pH. The thing that tells u it was a strong base was the fact that the equivalence point is 7.</p>
<p>answers...
1. the O18 adn O16 were isotopes
2. Catalyst lowers Activation energy - T, does it lower heat???</p>
<p>does teh section with true and fasle count as 3 questions or is there no partila credit?</p>
<p>Partial credit? On SAT tests? Ha ha.</p>
<p>The T T CE section is just like a regular mc question: it has 5 possible choices. TT, TTCE, TF, FT, FF.</p>
<p>I don't think catalyst lowers the heat released, but it does lower the act. energy like u said. so it was T,F or F,T - i forgot the order.
no partial credit - you have to get each part of the question right to get the credit for 1 question on that section</p>
<p>My son took the SAT II chem today and was pretty devastated. He said it was a lot harder than the practice tests. He couldn't finish and had to guess on many of the questions. What was the feedback from the kids at your schools about this test? My son is thinking of cancelling it. He only took chem honors this year....AP not offered til senior year. A lot of the kids in his class were getting 700''s on practice tests. He was getting low 600's.</p>
<p>For the questions:
the activation energy changes the heat content/ increases the activation energy. I put FF
the question asking for sodium carbonate in water forms a pH of 7. I put FF
The question asking which of the following changes the pH of water. I put MgO and SO3
Anyone got anything different?</p>
<p>I thought sodium carbonate was a basic salt so it forms a basic solution in hydrolysis</p>
<p>natstarmd, why not wait to see your son's score? Many kids said the test was harder than the practice tests. May be the curve will be easier. Good luck!</p>