<p>And I verified, the e- config of Zn2+ is indeed [Ar]3d10 since the electrons with the higher quantum number n is removed first–thus the 4s2 electrons are removed.</p>
<p>For f) on the first question, what was the equation they wanted (similar to that dichromate/chromate equilibrium lab mebbe?) and how did you determine which Ksp was smaller? I said AgI was lower because if it were higher then the soln. wouldn’t have immediately turned, but I did not know how to solve it.</p>
<p>I said Ag+ + I- –> AgI…</p>
<p>We should really get a consolidated post of all the answers we’ve got so far…</p>
<p>That is the correct reaction.</p>
<p>No it’s not. The correct one is agbr + i- -> agI + br-</p>
<p>It said agbr solid</p>
<p>Did you have to write the words “effective nuclear charge” to earn the point for question 6b?</p>
<p>6b was definitely zn. they wanted you to understand the trend and know zn2+ had less electrons</p>
<p>I thought it was exothermic for #2b because heat is lost to the environment? I was pretty sure about this…anyone have an explanation?</p>
<p>You guys are wrong. It is Zn+2. Less electrons=larger nuclear charge on the remaining electrons. Also, It is like comparing the 3rd ionization of Zn to the first. 3rd is larger. Case closed.</p>
<p>I was thinking endo because although temp goes down, heat is absorbed by calorimeter, thus reducing temp of the “solution”–so since it’s in a calorimeter and not a beaker, it would feel warmer, but the solution, contrary to what an endothermic reaction should be like, would get colder.</p>
<p>Oh, I see. Yea I am wrong…o well. Hopefully still got my 5.</p>
<p>less electrons mean less shielding effect to oppose the nuclear charge, which remains the same due to the same number of protons. Therefore less electrons = more IE required. Im pretty srue zn2+ was the answer.</p>
<p>Was 3d yes or no? I put no…</p>
<p>zn2+ was definitely the answer im almost certain, 3d was no : )</p>
<p>So according to your reasoning iron has a greater ionization energy than zinc.</p>
<p>the number of electrons DOES NOT dictate the configuration of elements. its the number of protons Zn2+ is NOT an iron, you mean nickel btw. the reason why nickel has less IE than Zn is because the number of the protons is different. So it pulls onto the electrons in a lot lesser degree. but in this case Zn2+ and Zn has same number of protons while Zn2+ has less electrons to repel the nuclear charge made by the protons.</p>
<p>i cant we’ve been arguing about this question for 7 pages lmao</p>
<p>100% Zn2+ is the answer. Not even a question. The electrons are removed from the 3rd level instead of the fourth which requires much more energy.</p>
<p>lol i know and it’s a real simple question too. (i put vinegar as the answer cus i thought water would be too easy on that lab question so i can’t really say much haha)</p>
<p>@noob107: yep no way u can relate this question to common periodicity, its all about the shielding electrons and the number of energy levels </p>
<p>^yjs1210: haha im sure u did well on the rest of ur exam</p>
<p>lets move on : )</p>