Simple questions on Destroyer GCHEM...

[Lazerous]

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1) What is the difference between an electrolytic and electrochemical cell? I know what an electrolytic is and the only other cell I am familiar with is the galvanic/voltaic cell.

2) Can somebody explain to me paramagnetic and diamagnetc; also what happens to each when exposed to a magnetic field.

3) In question 74, how does the molar solubility of PbI2 decrease when more KI is added (common-ion effect), according to Le-chatleurs principle if we add a common ion (in this case I-) then the reaction will shift to the left so PbI2 should INCREASE

***4) This is somewhat related to question 3. Once again, look at the solutions to question 74 and 82. See in 82 when we added a common-ion the molar solubility increased didn't it?

 

[Lazerous]

No one? You don't have to answer all the questions at once, just whichever question you know and can help me out with.

Thanks

 

[Orgodox]

1) What is the difference between an electrolytic and electrochemical cell? I know what an electrolytic is and the only other cell I am familiar with is the galvanic/voltaic cell.

Some one posted this yesterday had a few good answers in it

2) Can somebody explain to me paramagnetic and diamagnetc; also what happens to each when exposed to a magnetic field.

Paramagnetic means that not all the electron are paired up. When they are diamagnetic they are all paired up for example Ca or Ar and overall there is no attraction to a magnetic field since the spins cancel. But a paramagnetic element would be attracted to a magnetic field.

3) In question 74, how does the molar solubility of PbI2 decrease when more KI is added (common-ion effect), according to Le-chatleurs principle if we add a common ion (in this case I-) then the reaction will shift to the left so PbI2 should INCREASE

Since you add more KI you increase the amount of I in the solution now less of the PbI2 can go to Pb2+ + 2I- Since there is more I around not by lechat it goes back to the left effectively decreasing solubility of PbI

***4) This is somewhat related to question 3. Once again, look at the solutions to question 74 and 82. See in 82 when we added a common-ion the molar solubility increased didn't it?

See above

 

[Orgodox]

If you would like me to elaborate Id be happy to just let me know

 

[klutzy1987]

3) if you add more I then less of PbI3 will dissolve. Therfore the reaction will be shifted to the left. Molar solubility measures how much will dissolve and dissociate into the solution.

 

[klutzy1987]

1) What is the difference between an electrolytic and electrochemical cell? I know what an electrolytic is and the only other cell I am familiar with is the galvanic/voltaic cell.

Some one posted this yesterday had a few good answers in it

2) Can somebody explain to me paramagnetic and diamagnetc; also what happens to each when exposed to a magnetic field.

Paramagnetic means that not all the electron are paired up. When they are diamagnetic they are all paired up for example Ca or Ar and overall there is no attraction to a magnetic field since the spins cancel. But a paramagnetic element would be attracted to a magnetic field.

3) In question 74, how does the molar solubility of PbI2 decrease when more KI is added (common-ion effect), according to Le-chatleurs principle if we add a common ion (in this case I-) then the reaction will shift to the left so PbI2 should INCREASE

Since you add more KI you increase the amount of I in the solution now less of the PbI2 can go to Pb2+ + 2I- Since there is more I around not by lechat it goes back to the left effectively decreasing solubility of PbI

***4) This is somewhat related to question 3. Once again, look at the solutions to question 74 and 82. See in 82 when we added a common-ion the molar solubility increased didn't it?

See above

Wow you put some real effort into this one, i was being lazy and just answering briefly. lol Your post wasnt there when i first began typing mine.

 

[Orgodox]

Thanks Klutzy didnt take to long plus I really like this stuff! Man I wish I could just take it again I know Id do better and I dont mind studying AHH lol

 

[jdent]

Hey you guys could take mine for me. Sounds like you guys are bored!

 

[Lazerous]

1) What is the difference between an electrolytic and electrochemical cell? I know what an electrolytic is and the only other cell I am familiar with is the galvanic/voltaic cell.

Some one posted this yesterday had a few good answers in it

2) Can somebody explain to me paramagnetic and diamagnetc; also what happens to each when exposed to a magnetic field.

Paramagnetic means that not all the electron are paired up. When they are diamagnetic they are all paired up for example Ca or Ar and overall there is no attraction to a magnetic field since the spins cancel. But a paramagnetic element would be attracted to a magnetic field.

3) In question 74, how does the molar solubility of PbI2 decrease when more KI is added (common-ion effect), according to Le-chatleurs principle if we add a common ion (in this case I-) then the reaction will shift to the left so PbI2 should INCREASE

Since you add more KI you increase the amount of I in the solution now less of the PbI2 can go to Pb2+ + 2I- Since there is more I around not by lechat it goes back to the left effectively decreasing solubility of PbI

***4) This is somewhat related to question 3. Once again, look at the solutions to question 74 and 82. See in 82 when we added a common-ion the molar solubility increased didn't it?

See above

Thank you so much!

Also, just what is molar solubility? Is it Ksp or is it simply Molarity or neither?

I have one more question concerning E values: You know how you determine what the strongest oxidizing and reducing agents are based on E-values; like the most positive E is the strongest oxidizing agent....

...Bah! I can't explain it, if you have destroyer on you then I am talking about question 103 of GChem. It says the strongest oxidizing agent is the one with the most positive E. But all of those are written in terms of reduction potentials; what iif they were written in terms of oxidation potentials??
Would that make Mg2+ the strongest oxidizing agent then?

 

[Orgodox]

Hey you guys could take mine for me. Sounds like you guys are bored!

Dude, I would if I could! Enjoy the ride.
NOT BORED AT ALL! Have tons of PMs to answer and gotta send my app today plus haven't done one thing for myself in about 3 months so I have a list out the door of things I gotta do this summer and my wife has been awesome and so nice not to make me do ANYTHING while I studied but its only fair to get moving on those things now
Hey Jdent why done you head uptown and help me hang these mirrors and install this stuff and then Ill help you study the rest of the day-lol

 

[Orgodox]

Thank you so much!

Also, just what is molar solubility? Is it Ksp or is it simply Molarity or neither?

I have one more question concerning E values: You know how you determine what the strongest oxidizing and reducing agents are based on E-values; like the most positive E is the strongest oxidizing agent....

...Bah! I can't explain it, if you have destroyer on you then I am talking about question 103 of GChem. It says the strongest oxidizing agent is the one with the most positive E. But all of those are written in terms of reduction potentials; what iif they were written in terms of oxidation potentials??
Would that make Mg2+ the strongest oxidizing agent then?

I dont have my book but I know exactly which question youre talking about. Just think about it logically dont memorize its good to try and make sure you understand this (and everything) to a deeper level so Ill try and help... Something is a really strong oxidizing agent when it really wants to be reduced ie it really wants to gain electrons. So the more it wants to gain electrons the stronger it is as an oxidizing agent. For example (I think this is also the one is the book) F REALLY REALLY wants an electron so it is the strongest oxidizing agent because it wants to get reduced the most! Just take a step back it makes sense!!

 

[Lazerous]

I dont have my book but I know exactly which question youre talking about. Just think about it logically dont memorize its good to try and make sure you understand this (and everything) to a deeper level so Ill try and help... Something is a really strong oxidizing agent when it really wants to be reduced ie it really wants to gain electrons. So the more it wants to gain electrons the stronger it is as an oxidizing agent. For example (I think this is also the one is the book) F REALLY REALLY wants an electron so it is the strongest oxidizing agent because it wants to get reduced the most! Just take a step back it makes sense!!

Yeah after I posted that, I re-read the solution and it said that metals are the strongest reducing agents. So I sat down and thought about it for a little while and finally came up with an explanation similar to yours! So thank you!! Your explanation just helped me confirm my theory was correct. 😀

I have a question about the paramagnetic vs paramagnetic thing. Since electrons fill orbitals according to Hund's rule. Does that mean Manganese is paramagnetic since there is only 1 electron per d-orbital?