<p>…These explanations aren’t making sense! >_<</p>
<p>All of those are covalent…</p>
<p>murderah, is what you said the same as the reasoning that the bonds form a lattice structure?</p>
<p>One example question that I can’t figure it out:</p>
<p>A 1.0 L sample of an aqueous solution contains 0.10 mol of NaCl and 0.10 mol of CaCl2. What is the minimum number of moles of AgNO3 that must be added to the solution in order to precipitate all of the Cl- as AgCl (s) (Assume that AgCl is insoluble)</p>
<p>A. 0.10 mol
B. 0.20 mol
C. 0.30 mol
D. 0.40 mol
E. 0.60 mol</p>
<p>In the electroplating of nickel, .200 faraday of electrical charge is passed through a solution of NiSo4. What mass of nickel is deposited?
a) 2.94g
b) 5.87g
c) 11.7g
d) 58.7g
e) 294g</p>
<p>Is that basic stoichiometry? :</p>
<p>Molarity of Cl = 0.2 + 0.1 mols</p>
<p>Since Ag+ + Cl- -> AgCl,</p>
<p>C. 0.30 mol</p>
<p>^^Yeah! Thanks!</p>
<p>ahh i blanked on how to do that one with the AgCl!! How do you set up the stoichiometry for that?</p>
<p>sorry for sounding like an idiot but frnakly i’m freaked out. please help</p>
<p>0.2 faraday means 0.2 mol of e- right?</p>
<p>And can someone plz explain beer’s law–</p>
<p>its like A = abc where A is total aborbtivity a is a constant for the solution b is path length and c is the molarity of solution. But what is path length measured in?</p>
<p>And is there any better way to right it than the A= abc that was in my princeton review book?</p>
<p>I THINK path length is measured in cm?</p>
<p>Wait, why do we need to know Beer’s Law?</p>
<p>Lab Question. I think the Beer’s Law describes the proportional relationship between the absorbtivity and the concentration.</p>
<p>"ahh i blanked on how to do that one with the AgCl!! How do you set up the stoichiometry for that?</p>
<p>sorry for sounding like an idiot but frnakly i’m freaked out. please help"</p>
<p>guys please?</p>
<p>i seriously doubt beer’s law would be on the test… or an important part of it…</p>
<p>Nah, beer’s law was the </p>
<p>whatever = a<em>b</em>c
absorbance v. concentration.</p>
<p>Unimportant, I think.</p>
<p>you dont really need to beers law…i doubt that youll see that on the test</p>
<p>
</p>
<p>Since you have .1 mol of Cl from NaCl and .2 mol from CaCl2 (for every mole of CaCl2, you get two moles of Cl), you have .3 mol Cl.</p>
<p>Since the reaction is Ag+ + Cl- -> AgCl, the stoichiometry is one to one, so for every 1 mol Cl, you need 1 mol Ag.</p>
<p>Does that help?</p>
<p>the answer is .3 mol AG</p>
<p>yeah thanks a lot, i just didnt think about the 2 Cls in the CaCl2…</p>
<p>stupid. hopefully i’ll be clearer tomorrow. I’m trying to get in the obscure stuff now so it seems as though i’m pushing the basics aside to make room for that :(</p>
<p>here are some terms we might see on there.</p>
<p>Pauli Exclusion Principle- unique set of quantum number (n,l,m,s) for every electron in an atom.</p>
<p>Hund’s Rule- single occupied orbitals first then double up on the orbitals with two electrons</p>
<p>Heinsenberg Uncertainty- can not know position and direction (?) of electron at a given time.</p>
<p>Beer’s Law was on the 2003 FR. I doubt it will be on it this year, since now every question is mandatory.</p>
<p>these definition things might help you on an MC but it wont be something youll be seeing on a theory frq</p>
<p>A) NH3 and NH4Cl
B) H3PO4 and NaH2PO4
C) HCI and NaCl
D) NaOH and NH3
E) NH3 and HC2H3O2</p>
<ol>
<li>The solution with the lowest pH is…</li>
<li>The most nearly neutral solution</li>
<li>A buffer at a pH > 8</li>
<li>A buffer at a pH < 6</li>
</ol>