# Recent content by j3llzang

1. ### Highschool chemistry question on Le Chatlier's Principle

Homework Statement I just have a concept question on LCP. in reaction: A(aq) + B(aq) <-> C(aq) A is added and rxn is left to reach a new equilibrium. Once @ new eqm, is [A] higher than before? and obviously [C] is lower, right?
2. ### Common ion effect - calculations.

oh my gosh, that's so funny! I thought my chemistry teacher was evil enough to give us a question that had a negative answer :) Well, solubility of Silver Chromate is 1.1x10-12, so I guess the question had it right. But how do you know that 2.0x10-4 M solution doesn't exist? Thanks! (ps: I don't...
3. ### Common ion effect - calculations.

Hmm.. concentration of CrO4 comes from Na2CrO4... Well, I used algebra to find the initial concentration of CrO4, and ended up with a negative value. Here's what I did: I declared x as [CrO4]init, so [CrO4] @ eqb = 1.0x10-4 + x Since Ksp = [Ag]^2[CrO4], [CrO4] (at eqb?) = 1.1x10-12 /...
4. ### Common ion effect - calculations.

I like how everyone answers the questions with another question. lol As I stated above, I did find the final concentration of Ag+, which came out to be 2.0x10-4M
5. ### Common ion effect - calculations.

Homework Statement When 50.0 mL of a 2.0 × 10-4 M Ag2CrO4 solution was added to 50.0 mL of a Na2CrO4 solution a ppt formed (Ag2Cro4). What was the initial concentration of this Na2CrO4 solution? Ksp Ag2CrO4 = 1.1 × 10-12 Homework Equations Given A2 (aq) + B(aq) -> AB(s) Ksp = [A]n[B] The...
6. ### 2D Vector Kinematics Problem (projectile)

aha! I misinterpreted your reply. I got it all figured out now. Thanks a lot ;)
7. ### 2D Vector Kinematics Problem (projectile)

Ahh,, I see your point! :) However, there's still a problem of finding voy or vfy... I can't put any of these two as zero, since there is the initial "kick" to the ball, which means at the bottom of its parabolic shape (above the 2.0m height), its v is not going to be zero... Any idea? :P
8. ### 2D Vector Kinematics Problem (projectile)

You mean v^2 = vo^2 + 2ad? or d=vot + 1/2 (at^2) Even if I were to use either one, I can't solve vf or vo for vertical, since I do not have dy (it would be bigger than 2.0m, because it moves up first) I am also not given the vo.... thanks for the quick reply, though :)
9. ### 2D Vector Kinematics Problem (projectile)

Homework Statement A person kicks a ball h of 2.0 m above the floor. If the ball flies at some angle and lands 1.2 s later at horiz d of 6.5 m from its orig. place, calc. the orig. horiz and vert. comp.s of the ball's v. Calc. the final components of the ball's v. (Assume the ball has no horiz...