December 2007 Chemistry

Test Preparation SAT Subject Test Preparation
1

<p>guess ill start it off</p>

<p>i got 4 TTCE and 2 TT
the one about the water pressue in the setup (where u have to have the water levels equal to find pressure) was TTCE</p>

<p>last question with the HF and the 20% ionization was 0.008?</p>

<p>the one before that which asks how much precipitate was formed was 0.01mol?</p>

<p>Gold was the natural element found</p>

<p>H2 -> 2H is bond energy</p>

<p>CS2 + O2 -> CO2 + SO2</p>

<p>for titration it was the buret (a). for diluting something to a volume was the dropper pipet (b). then most accurate measurement of volume was graduated cylinder (d)</p>

<p>for the one with adding a catalyst to the reaction it was that the final concentrations dont change (c)</p>

<p>the Keq was 0.120^2/0.040?</p>

<p>keep em comin guys</p>

2

<p>did nobody take chemistry? >_></p>

3

<p>dropper pipet had the big bulb on it.</p>

<p>to prepare hydrogen gas you add zinc to H2So4</p>

<p>CaO was the solid that forms a basic solution?</p>

4

<p>im almost positive its zinc. silver isnt reactive enough to displace hydrogen.</p>

<p>volumetric flask?? tthats not very accurate.</p>

5

<p>what about the partial pressure of the gas? I bubbled 766mmhg</p>

6

<p>yeah its zinc because its more reactive</p>

7

<p>yea just subtract 24</p>

8

<p>there was something about 0.06 moles of one gas and 0.04 moles of another in a vessel with pressure 10^3..
I remember bubbly 400 (options were 40, 60, 400, 600 and something else)</p>

9

<p>was the one with find the molar mass of the gas besides O2 "2.5 x 32"</p>

10

<p>its 400 yes</p>

11

<p>yes. look at the reactivity chart. a metal in an acid either reacts in a single displacement or does not occur, depending on the reactivity of the metal. im lookin at my reactivity chart and Zn is above hydrogen, meaning that H2 is more stable and will thus be alone. Ag doesnt.</p>

12

<p>uhm. well ammonia was 82% nitrogen. in the beginnin, im talkin about the matching, the first set of 3. lowest ionization energy was Cs. noble gas was like Xe. and then it asked which is an elemental solid found in nature. i put Au and im pretty sure it is, beacuse its not very reactive but iron is pretty reactive. it was between those 2.</p>

<p>ionization energy was an answer.</p>

<p>octane was a matching answer where it doesnt dissolve in solution</p>

<p>in the TF -- butane question was T because it has a higher vapor pressure. the second part was also T beacuse it has more H in a molecule. but its not CE as theyre not related.</p>

13

<p>I think we 3 were the only ones who gave chem lol...
Anyway anybody remember the answer from the energy graph asking about activation energy? wasn't it 80 something?</p>

14

<p>88 was the answer, u had to add them</p>

<p>acetone was the answer with the graph. it asked which has a boiling point at 50C.</p>

15

<p>ok more q's</p>

<p>a weak electrolyte --- weak conductor of electricity in solution</p>

<p>NaCl dissolved in water does lower the vapor pressue and does lower freezing point but DOES NOT lower boiling point</p>

16

<p>do u remember the exact butane question?</p>

<p>im pretty sure its Au cuz Fe is much more reactive</p>

17

<p>i really hope so. anything else?</p>

18

<p>Does anyone remember the answer to the isomer - polymer question? I just guessed because I hadn't read the organic chemistry chapter in Barron's. It was too confusing to self-teach.</p>

19

<p>it was the hydrocarbons in different order? >_> it had like 2 C's 1O and 6 Hs</p>

20

<p>isomer is something which has same molecular formula, but different structure isnt it?</p>