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Old 04-01-2014, 04:46 AM   #9801
EndTheRapture51
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I handed in my dissertation last week and I have a viva today being asked questions about it and man I am so nervous just going over the basics like CO back bonding.
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Old 04-01-2014, 04:06 PM   #9802
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I need help writing net ionic equations, guys.
(1)AgNO3+HCl
(2)Ca(NO3)2+Na2CO3
(3)Zn(NO3)2+Na2EDTA
(4)Pb(NO3)2+HCl
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Old 04-01-2014, 04:10 PM   #9803
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Quote:
Originally Posted by EndTheRapture51
I handed in my dissertation last week and I have a viva today being asked questions about it and man I am so nervous just going over the basics like CO back bonding.

Good luck. I mainly got questions about the limitations of my research and how it could be improved had I more time. Which was all in my presentation anyway.
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Old 04-01-2014, 07:01 PM   #9804
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Quote:
Originally Posted by Ablast
I need help writing net ionic equations, guys.
(1)AgNO3+HCl
(2)Ca(NO3)2+Na2CO3
(3)Zn(NO3)2+Na2EDTA
(4)Pb(NO3)2+HCl


Compliments of DamienEx1021 from the FOTB:

1) Ag + + CL - -> AgCl (s)
2) Ca 2+ + CO3 2- -> CaCO3 (s)
3) Is a bullshit question because everything there is soluble. EDTA is only a metal scavenger and remains soluble even after reacting with metals in solution. Your teacher is probably looking for this though: Zn 2+ + EDTA 2- -> ZnEDTA
4) Pb 2+ + Cl - -> PbCl2

You just have to learn what is and is not soluble. Here is a good general guide for solubility with some rules exceptions and what not:
http://employee.heartland.edu/rmuen...bilityrules.pdf
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Last edited by AeroRocker : 04-01-2014 at 07:02 PM.
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Old 04-11-2014, 05:44 PM   #9805
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Does anyone here know how to do optimization? I am struggling to figure this shit out.
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Old 04-11-2014, 05:59 PM   #9806
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Quote:
Originally Posted by Ablast
Does anyone here know how to do optimization? I am struggling to figure this shit out.


With regards to.... what?
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Old 04-11-2014, 08:36 PM   #9807
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Originally Posted by gonzaw
With the whole wave graviation and cosmic radiation thing from the last month, I wanted a refresher.

Why exactly, when you point a telescope at any point in the sky, you see radiation from the early stages of the Big Bang?
It has to do with something about space time and space expanding....but I forgot


bump.
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Old 04-11-2014, 08:39 PM   #9808
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Old 04-11-2014, 09:15 PM   #9809
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Yeah that doesn't explain it. I already know about most of that, but I can't intuitively figure out why we can check the CBR by pointing at any point in the sky.
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Old 04-13-2014, 02:08 PM   #9810
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Quote:
Originally Posted by DamienEx1021
With regards to.... what?

My homework says:
Dr. Alan Grant rescued two angry velociraptors. If they are not separated, they will fight to the death. Dr. Grant want to fence in an area of 2,000,000 square feet in a rectangular field, and then divide it in half with a fence down the middle, parallel to one side. What is the shortest length of electrified fence Dr. Grant can use?

So i figured since it is a perimeter problem that it would be something along the lines of 3w(width) + 2l(length) +l/2

w= 2,000,000/l
l= 2,000,000/w

so I wrote it in terms of l and I got, F= 3(2,000,000/l) + 2l + l/2
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Old 04-13-2014, 04:06 PM   #9811
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Where does the + l/2 come from? Shouldn't it be just 3w + 2l?

Anyway, you have to take the derivative of F and see where it changes from negative to positive (i.e. when it equals zero), which is when the F function stops decreasing and starts increasing (i.e. the minimum).
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Old 04-14-2014, 12:29 AM   #9812
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Quote:
Originally Posted by sickman411
Where does the + l/2 come from? Shouldn't it be just 3w + 2l?

Anyway, you have to take the derivative of F and see where it changes from negative to positive (i.e. when it equals zero), which is when the F function stops decreasing and starts increasing (i.e. the minimum).

Oh yeah, you're right. I don't know what I was thinking, I was tired haha
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Old 04-18-2014, 03:51 PM   #9813
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Can anyone check my net ionic equations? I need them checked before 3ish

AgNO3 + HCl = AgCl (HNO3 cancels out due to solubility)
Ca(NO3)2 + Na2CO3 = CaCO3 (Na2(NO3)2 cancels out due to solubility)
Zn(NO3)2 + Na2EDTA = ZnEDTA (Na2(NO3)2 cancels out due to solubility)
Pb(NO3)2 + HCl = PbCl2 (Not sure what happens to HNO3)
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Old 04-18-2014, 04:13 PM   #9814
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Quote:
Originally Posted by Ablast
Can anyone check my net ionic equations? I need them checked before 3ish

AgNO3 + HCl = AgCl (HNO3 cancels out due to solubility)
Ca(NO3)2 + Na2CO3 = CaCO3 (Na2(NO3)2 cancels out due to solubility)
Zn(NO3)2 + Na2EDTA = ZnEDTA (Na2(NO3)2 cancels out due to solubility)
Pb(NO3)2 + HCl = PbCl2 (Not sure what happens to HNO3)


You need to leave out what is soluable on BOTH sides of the equation and write them as ions across the board. I already answered this for you two weeks ago.

Quote:
Originally Posted by AeroRocker
Compliments of DamienEx1021 from the FOTB:

1) Ag + + CL - -> AgCl (s)
2) Ca 2+ + CO3 2- -> CaCO3 (s)
3) Is a bullshit question because everything there is soluble. EDTA is only a metal scavenger and remains soluble even after reacting with metals in solution. Your teacher is probably looking for this though: Zn 2+ + EDTA 2- -> ZnEDTA
4) Pb 2+ + Cl - -> PbCl2

You just have to learn what is and is not soluble. Here is a good general guide for solubility with some rules exceptions and what not:
http://employee.heartland.edu/rmuen...bilityrules.pdf
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Old 04-18-2014, 04:20 PM   #9815
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Originally Posted by DamienEx1021
You need to leave out what is soluable on BOTH sides of the equation and write them as ions across the board. I already answered this for you two weeks ago.

I tried turning that in last week, TA said that it was wrong.
Personally, I believe you, only because my TA never really knows what is going on
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Old 04-18-2014, 04:31 PM   #9816
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Quote:
Originally Posted by Ablast
I tried turning that in last week, TA said that it was wrong.
Personally, I believe you, only because my TA never really knows what is going on


Oh FFS. You TA is a brain dead idiot who should be shot butchered and left out to dry on a tanning rack. Take the answer to your professor and ask exactly what you are doing wrong.

Here is the "go for broke" answer because I cant think of what else the turd wants to see in this.

1. Ag+ + NO3- + H+ + Cl- = AgCl (s) + HNO3 (aq)

2. Ca2+ + 2NO3- + 2Na+ + CO3 2- = CaCO3 (s) + 2NaNO3 (aq)

3. Zn2+ + 2NO3- + 2Na+ + EDTA 2- = ZnEDTA (?) + 2NaNO3 (aq)
Only reason I have a (?) there is because EDTA is soluble regardless of the situation. it is TECHNICALLY (aq) but you might as well put the (s) there for some unknown reason. Like I said, ask your prof, not the TA.

4. Pb2+ + 2NO3- + 2H+ + 2Cl- = PbCl2 (s) + 2HNO3 (aq)

F*ck if I know what else they want to see there.
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Old 04-18-2014, 04:36 PM   #9817
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Originally Posted by DamienEx1021
Oh FFS. You TA is a brain dead idiot who should be shot butchered and left out to dry on a tanning rack. Take the answer to your professor and ask exactly what you are doing wrong.

Here is the "go for broke" answer because I cant think of what else the turd wants to see in this.

1. Ag+ + NO3- + H+ + Cl- = AgCl (s) + HNO3 (aq)

2. Ca2+ + 2NO3- + 2Na+ + CO3 2- = CaCO3 (s) + 2NaNO3 (aq)

3. Zn2+ + 2NO3- + 2Na+ + EDTA 2- = ZnEDTA (?) + 2NaNO3 (aq)
Only reason I have a (?) there is because EDTA is soluble regardless of the situation. it is TECHNICALLY (aq) but you might as well put the (s) there for some unknown reason. Like I said, ask your prof, not the TA.

4. Pb2+ + 2NO3- + 2H+ + 2Cl- = PbCl2 (s) + 2HNO3 (aq)

F*ck if I know what else they want to see there.

The class is a lab, and I have never seen an actual professor there, which sucks. I will take it to my chem151 instructor and have him check it too. Maybe the department likes things a certain way

Thanks though

Just got back from the chem building, and your work gave me a 90% (-5% for being late) but thank you very much. It was graded by some other TA, so I guess my TA is a twat

Last edited by Ablast : 04-18-2014 at 07:47 PM.
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