June 2009 - Chemistry

<p>IC, solubility and state. Thanks dan, bigb, fed.</p>

<p>There was a lengthy gas law problem too:</p>

<p>What is the final volume if the temperature is raised from A to B Kelvin and the pressure decreased from Y to Z atm?</p>

<p>It was like at the top left of a new page, after the T/F/CE section. Did the volume stay the same at 8L?</p>

<p>^yes it did.
pv/t=pv/t</p>

<p>The volume stayed at 8L.</p>

<p>would a raw of 75 equate to roughly a 770???, i know i got a raw from 74-77, where do you guys think that lands?</p>

<p>760-780</p>

<p>from blue book (sorta harsh curve):</p>

<p>74 = 760
75 = 760
76 = 770
77 = 770</p>

<p>So far I’ve counted 8 wrong-- should I cancel if I want a 750+?</p>

<p>ur still in 760 range, up to u</p>

<p>Can someone explain why Rubidium is the most reactive? Yes it is an alkali metal but since it is so far down in its group, i assumed silver would be more reactive…</p>

<p>Alkali metal is all you really need to know.</p>

<p>Rubidium is the most reactive because for metals the farther left and down you go on the periodic table, the more reactive and metallic they get.</p>

<p>Also, in general, Halogens and Alkali Metals are the most reactive elements.</p>

<p>There’s not much to it. Alkali metals have the lowest ionization energies because they want to lose that outer valence electron to attain noble gas configuration.</p>

<p>any 800-ers here?</p>

<p>Also, electron shielding increases down a group, so ionization energies are lower, making the element more likely to lose electrons, and thus, more reactive.</p>

<p>Time for me to give back!</p>

<p>Dear noreally,</p>

<p>Chemical reactivity increases down the alkali group, so in terms of reactivity, Rb > K > Na, etc.</p>

<p>OMG WHY REMAKE HAX!!11one1!shift!!!1</p>

<p>It’s the shielding effect. There are more orbitals as you move further down the group; the increasing number of orbitals shields the outermost valance electrons from the positive nucleus’s pull.</p>

<p>Silver is one of the least reactive metals because it incorporates one of its 5s electrons to completely fill the 4d orbital.</p>

<p>This assuming that you’re familiar with the fundamental principle of chemical reactivity: it depends on the configuration of the element’s valence electrons. Otherwise I’m speaking gibberish lolololol.</p>

<p>thanks 10 char</p>

<p>I still have a shot at 800 :D</p>

<p>I signed up for this test because I took AP. But I decided to take a different one instead. I’m not bad at Chem, at all. I mean, it’s one of my more difficult subjects… but I’m not bad at it. Just not amazing or anything. </p>

<p>Anyway, I kind of freaked out after taking the Late AP test and decided I didn’t want to touch anymore chem. Apparently a lot of CCers felt that it was an overly difficult test. </p>

<p>So do you think I should give chem another shot in the fall? Was it easy? If I keep my chem knowledge brushed up from AP will I be okay?</p>

<p>I’m almost certain I have a 800. -0 so far.</p>

<p>To all you people who think or at this point “know” that you got 800s, did you take any prep classes, use a guidebook, or just wing it ( by the way I have 3 wrong so far, 2 omitted)</p>

<p>I just took AP Chem.</p>