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Old 12-03-2009, 09:01 PM #946
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Quote:
Originally Posted by clumsy View Post
calc help:
i need to find y' of
y= 3 / √x +2

Depends on what it is, if it's 3/(√(x+2)) then it's 3*(√(x+2))^-1 which is 3*(x+2)^-(1/2). lmk if it's something else.
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Old 12-03-2009, 09:39 PM #947
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So I have a AP-Chemistry test tomorrow. I would like to pass because I'm currently failing the class with a 30 or so. So ST I have a couple questions to ask.

1)When drawing Lewis structures how do you know when to double bond or place lone pairs?

2)Is there any way to the determine melting point of an element by drawing a Lewis structure?

3)How do you determine intermolecular forces? I know it has something to do with lone pairs but I'm lost beyond that.

Thanks,
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Old 12-04-2009, 10:37 PM #948
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does the nadph go on to the calvin cycle? and if so, ONLY during light dependent reactions?
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Old 12-05-2009, 11:39 PM #949
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i need to cite this
http://banking.about.com/od/loans/a/buildcredit.htm
how would i go about putting that in my works cited page, and i have a couple of those by the same guy, how would i put those in the text and differentiate between them?
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Old 12-06-2009, 06:37 AM #950
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Here is MLA
Pritchard, Justin. "Build Credit - How to Build Credit - Why it is Important to Build Credit." Banking and Loans at About.com - Best Ways to Bank - Tips for Borrowers. N.p., n.d. Web. 6 Dec. 2009. <http://banking.about.com/od/loa


and APA
Pritchard, J. (n.d.). Build Credit - How to Build Credit - Why it is Important to Build Credit. Banking and Loans at About.com - Best Ways to Bank - Tips for Borrowers. Retrieved December 6, 2009, from http://banking.about.com/od/loan


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Old 12-06-2009, 10:14 AM #951
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ahh many thanks
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Old 12-06-2009, 02:41 PM #952
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Having trouble finding the second derivative of x^3/(x^2-4). I get through the first easily, but then it goes downhill.
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Old 12-06-2009, 03:07 PM #953
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ok one more, i have like 3 online articles by the same guy, and i need to cite each one in the text. but idk how. i know i cant just put his name in parenthesis next to each one, but idk what to do there.

advice?
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Old 12-06-2009, 03:32 PM #954
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Any Chem majors here today? I have an arrow pushing problem for you! What's the product here? Its a one step problem, but I just can't work it out.

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Old 12-06-2009, 03:55 PM #955
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Originally Posted by Smart Parts Player12 View Post
Having trouble finding the second derivative of x^3/(x^2-4). I get through the first easily, but then it goes downhill.
Quotient rule
((x^2-4)*(3x^2)-(x^3)(2x))/((x^2-4)^2)

If you have to simplify that, sucks to be you
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Old 12-06-2009, 04:37 PM #956
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Quote:
Originally Posted by qu1cks1lver56 View Post
ok one more, i have like 3 online articles by the same guy, and i need to cite each one in the text. but idk how. i know i cant just put his name in parenthesis next to each one, but idk what to do there.

advice?
First citation will be (complete article name page). Subsequent citations from the same article will be (shortened, but obvious name page).
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Old 12-06-2009, 05:14 PM #957
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does the nadph go on to the calvin cycle? and if so, ONLY during light dependent reactions?
yes NADPH and ATP are what power the calvin cycle. Not sure what youre trying to ask on your second question but the calvin cycle is the light-independent reaction and the NADPH is created from the light-deprendent reactions
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Old 12-06-2009, 05:35 PM #958
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Originally Posted by Pyrosive View Post
Quotient rule
((x^2-4)*(3x^2)-(x^3)(2x))/((x^2-4)^2)

If you have to simplify that, sucks to be you
Well that's to get the first derivative, which I can do. My second derivative= 8x(x^4+12x-4x^2-48). What's the easiest way to factor that out.
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Old 12-06-2009, 08:39 PM #959
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product rule, use power rule to get deriv of the part in parentheses
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Old 12-06-2009, 08:46 PM #960
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Quote:
Originally Posted by nflvikings View Post
First citation will be (complete article name page). Subsequent citations from the same article will be (shortened, but obvious name page).
i got that, but ive got multiple articles from the same guy, so would i just put (name of first article page) and then (name of second article page) and not the authors name? or still include his name?
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Old 12-07-2009, 08:48 PM #961
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looking for some chemistry help

The question is:

Determine the energy available from the combustion of 25g of hydrogen.

Last edited by DntDrnkThWtr : 12-07-2009 at 08:54 PM.
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Old 12-07-2009, 09:50 PM #962
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AP CHEM, Integrated rate laws? Anyone Tips?
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Old 12-08-2009, 12:24 AM #963
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Quote:
Originally Posted by Diametunim View Post
So I have a AP-Chemistry test tomorrow. I would like to pass because I'm currently failing the class with a 30 or so. So ST I have a couple questions to ask.

1)When drawing Lewis structures how do you know when to double bond or place lone pairs?

2)Is there any way to the determine melting point of an element by drawing a Lewis structure?

3)How do you determine intermolecular forces? I know it has something to do with lone pairs but I'm lost beyond that.

Thanks,
1. use a double bond if you need to complete the octect of the central atom or if you run out of electron pairs to use so you double bond to complete the octet while still keeping your same number of electrons.

2. lewis structure NO, its all about intermolecular forces covalent < polar covalent < hydrogen bonding < ionic bonds. Its all on a chart of intermolecular forces man.

3. its all about the forces that hold it togetehr whether its van der walls forces or whatever man https://chemistry.twu.edu/tutorial/I...ForcesSum.html might help.

Quote:
Originally Posted by Pflaumen View Post
Any Chem majors here today? I have an arrow pushing problem for you! What's the product here? Its a one step problem, but I just can't work it out.

OH + CO2 perhaps?


Quote:
Originally Posted by DntDrnkThWtr View Post
looking for some chemistry help

The question is:

Determine the energy available from the combustion of 25g of hydrogen.
Combustion requires a carbon and oxygen to work I believe so you would need H2 + (some carbon with a known amount of energy given) --> H2O + CO2 I believe.
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Old 12-08-2009, 12:08 PM #964
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1. use a double bond if you need to complete the octect of the central atom or if you run out of electron pairs to use so you double bond to complete the octet while still keeping your same number of electrons.

2. lewis structure NO, its all about intermolecular forces covalent < polar covalent < hydrogen bonding < ionic bonds. Its all on a chart of intermolecular forces man.

3. its all about the forces that hold it togetehr whether its van der walls forces or whatever man https://chemistry.twu.edu/tutorial/I...ForcesSum.html might help.

OH + CO2 perhaps?


Combustion requires a carbon and oxygen to work I believe so you would need H2 + (some carbon with a known amount of energy given) --> H2O + CO2 I believe.
wouldnt this part need to be O2 as it cant burn without the presence of oxygen gas? I dont know, I always do combustion problems with hydrocarbons so maybe this one is different
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Old 12-08-2009, 02:07 PM #965
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wouldnt this part need to be O2 as it cant burn without the presence of oxygen gas? I dont know, I always do combustion problems with hydrocarbons so maybe this one is different
yes sorry I assumed an CO molecule for some reason but yes it would be C(anything you want) + O2 + H2 --> CO2 + H20 + whatever other byproduct.
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Old 12-08-2009, 06:21 PM #966
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Okay so im pretty ****ed for my english class tomorrow morning. Turns out i need to have an individual project to present tomorrow to the class. It's a class on King Arthur and the Knights of the Round Table. My ideas at this point are to rewrite a story from arthurian legend and just rework it so it has a different outcome. Basically she just told us to do a project, no guidelines or anything so pretty much anything goes. Any ideas for an arthurian legend project? Thanks in advance.
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