The AP Chemistry Study Thread

<p>i hope so...but i dunno if i'll be able to by tomorrow</p>

<p>My teacher says to just use 3 sig figs just to be safe because they give you leeway of 1 off. Usually the number of sig figs necessary is 2, 3, or 4.</p>

<p>yeah...that is true...we usually do that too...</p>

<p>do we need to know all those formulas for the MC?</p>

<p>but using a correct signifcant figures for each calculations have a little different answer than using three sig for each calculations. ex> 12.02 to 12.06</p>

<p>yeah...aren't you supposed to use one more sig fig than you need in the answer...</p>

<p>Good luck everyone!</p>

<p>Sleep Well!!!! Good Luck!!!!!!!!!!!</p>

<p>Sodium phospate and hydrochloric acid are mixed.</p>

<p>Is there a reason why PO4 (3-) + H(+) >>>> HPO4 (2-)</p>

<p>is the correct net ionic reaction instead of PO4(3-) + H(+) >>>> H3PO4 ????</p>

<p>Numbers in parenthesis are the charges</p>

<p>do we need to know the formulas for the MC? or are they only tested in FR?</p>

<p>Good Luck Chemmers! :)</p>

<p>night all, going to bed :) good luck tomorrow! 8am, nice aaaand early!</p>

<p>hey guys, would temperature change affect a cell potential?</p>

<p>that depends on the position of the equilibrium</p>

<p>Ecell = E0cell - RT/nF ln Q</p>

<p>so if Q>1, an increase in temp decreases cell potential</p>

<p>if Q=1, there is no effect, i suppose</p>

<p>Q<1, increase in temp increases cell potential</p>

<p>NaCl+HCl = ?</p>

<p>^isn't that no reaction? NaCl and HCl both dissociate; HCl is a strong acid, and all group 1a will dissociate.</p>

<p>how do u determine which ion etc. has a higher freezing point than another??</p>

<p>delta T = i Kf m (?)</p>

<p>This is it~ GOOD LUCK EVERYBODY!</p>

<p>Is organic chemistry worth reading?</p>

<p>I should say, is 20 minutes of seeing OC for the first time (princeton review) worth more than equal sleep?</p>