The homework help thread...(SERIOUS)

[Cell-Tech]

if u guys have any chemistry related questions (preferably ochem, less math crap) feel free to pm me them or just post it in here and i will try to answer them

I'll put up the same offer for physics. Most math too, but if it's a math course physics guys don't take I have to throw you a

[BigChamp89]

I'll put up the same offer for physics. Most math too, but if it's a math course physics guys don't take I have to throw you a

[img]http://knowyourmeme.com/i/3309/original/i-dunno-lol.jpg?1244616130[/img

lulz ur pretty much the only one answering those already

[ZionNYC]

Is it to ^(3-64) or just ^3 and then the whole thing minus 64?




No logs needed here. raise both sides to the 4/3 power:

x = 27^(4/3) ; x= 81

Thank bro. Have rapes.

[EatMarkers4lunch]

Just saying if anyone can find a good book summary for Emile or On Education by Jean-Jacques Rousseau that be super helpful will rep thanks

[st3223]

A bottle of Hydrochloric Acid is 37.0% HCl, density is 1.18g/mL. What is the molarity of the acid?

THIS ****ING STUMPED ME

[BigChamp89]

A bottle of Hydrochloric Acid is 37.0% HCl, density is 1.18g/mL. What is the molarity of the acid?

THIS ****ING STUMPED ME

ok

first i start with all the equations were gonna use, Molarity, density, and moles. Our goal is to come up with an answer that has the units moles/liter.
1) is the density in g/ml
but remember for molarity we need the volume to be in liters, so we use the conversion 2) that there are 1000 mLs in 1 L
3) since we want to get moles we use the molar mass of HCl which has units of grams/mole, which are reciprocated to get the moles on top and cancellation of the grams
4) is the percent given of HCl, remember that percent is really just parts per hundred, so you can say there are 0.37 grams of HCl per 1 gram of solution (or 37 grams of HCl per 100 grams of solution, as long as the ratio is 0.37)

calculate this answer and you get 11.97 which rounds to 12.0 with the 3 sig figs we are given and our answer is in moles per liter, which gives you a little more confidence that you have the right answer.

hope this helps, its been a while but this should be right, just remember dimensional analysis!

[7upyours]

solve the inequality
10^k-1 + 8 < -42

solve the inequality
-3 + log base 6 (n-5) > -2

domain restriction and number line are necessary. i have to test 2 points on # line, but im confused.

[IceJ]

Need help finding a war poem to compare to An Irish Airman Forsees His Death. Basically any war poem talking about how a war is pointless or the only reason their fighting is to go to heaven is good to compare to this one.

[Scrappy34]

anyone interested in proof reading my college application essay?

PM me if you are interested, I need some help/suggestions

The topic is: "Provide a statement (250 words minimum) that addresses your reasons for transferring and the objectives you hope to achieve"

[xNYG]

Alright this is a joke but I can't remember how to do this math lmao.

It's for a science lab.

If 88 ms = 0.11363 cm/ms
Then 1 ms = how much?

I feel like a retard...wtf.

[ifmlawl]

Alright this is a joke but I can't remember how to do this math lmao.

It's for a science lab.

If 88 ms = 0.11363 cm/ms
Then 1 ms = how much?

I feel like a retard...wtf.

Wouldn't you just divide 0.11363 by 88? 0.00129125

[Cell-Tech]

Alright this is a joke but I can't remember how to do this math lmao.

It's for a science lab.

If 88 ms = 0.11363 cm/ms
Then 1 ms = how much?

I feel like a retard...wtf.

Nah, we all forget things, happens to the best of us. You should use dimensional analysis here.

88ms/1 * 0.11363cm/ms --> ms cancel and you're left with 88 * 0.11363cm so:

88*0.11363 is how many cm are in one ms

[xNYG]

Nah, we all forget things, happens to the best of us. You should use dimensional analysis here.

88ms/1 * 0.11363cm/ms --> ms cancel and you're left with 88 * 0.11363cm so:

88*0.11363 is how many cm are in one ms

I forgot I could just use a proportion wow...

88/1 = 0.11363/x
88(0.11363) = 1x
9.99944 = x

But that doesn't make sense...?
Idk I'm lost, that wouldn't make any sense in my lab. Oh well I'll just ask my teacher tomorrow. I don't really care... I ended up not doing homework for 4 other subjects tonight anyway...

**** school.

[baxtej44]

General Chemistry question

The pH of a 0.1M citric acid solution is 2.6. Find Ka and pKa for citric acid.

wtf i'm so lost. I know that if I find Ka, i can take the -log of it to find pKa, but I don't even know where to begin for Ka.

I know that for a general acid

Ka=[H][A]/[HA]

where H is the acid part and the A is the anion part. HA is the remaining acid left because it's an equilibrium problem, and especially if it's a weak acid it won't dissociate completely.

and I did the ICE for the problem (Initial concentrations, change in concentration, and Equilibrium concentration)

C6H8O7 > H + C6H7O7
I: 0.1.......0........0
C:-x........+x......+x
------------------------
E:0.1-x.....x.........x

but from there, idk wtf to do...

[BigChamp89]

General Chemistry question




wtf i'm so lost. I know that if I find Ka, i can take the -log of it to find pKa, but I don't even know where to begin for Ka.

I know that for a general acid

Ka=[H][A]/[HA]

where H is the acid part and the A is the anion part. HA is the remaining acid left because it's an equilibrium problem, and especially if it's a weak acid it won't dissociate completely.

and I did the ICE for the problem (Initial concentrations, change in concentration, and Equilibrium concentration)

C6H8O7 > H + C6H7O7
I: 0.1.......0........0
C:-x........+x......+x
------------------------
E:0.1-x.....x.........x

but from there, idk wtf to do...

like always write down ur equations n sh!t, since we know the ph formula and the ph is given u can plug it in. if u solve the equation for the H+ conc. u will get 0.00251 M. then u can go on to use the Ka equation, since the amount of moles for disociated H+ ion is the same as the amount of disociated base ion the combined concentration is just the square of the H+ conc. the concentration for citric acid is given and u subtract the H+ from it (x in your case), my general equation for the Ka i shoulda put [C6H8O7 -x], my bad. I got 6.46x10^-5 for the Ka, (makes sense because its a weak acid) then to find the pka u take the -log of the Ka to get 4.2, (citric acid is a carboxylic acid and carboxylic acids have pkas of around 4-5... ull learn that in ochem) so it looks like i did this correctly

[EricFapton]

anyone?

[Cozzy27]

Need help Tmisc.

So, I got a report for tomorrow about creative non fiction. What do you suggest for me to have in terms of creativeness on reporting my topic?

Basically, I will be presenting them a powerpoint. Then what? need Halp.

[vegibales]

Good deal, this is a winning idea.

agreed

[jjsmooth21]

any tips on how to read a terrible book for english class?

[SmallTexan]

I need why is it significant and connections to government! REPS

http://www.cnn.com/2011/WORLD/africa....html?hpt=Sbin

[kopimi]

any tips on how to read a terrible book for english class?

sparknotes. never read a book (we were required to read) in high school. did read ones i wanted to.

I need why is it significant and connections to government! REPS

http://www.cnn.com/2011/WORLD/africa....html?hpt=Sbin

brb learning how to link

[BrianGr]

Need a topic for English
-assignment is a five paragraph satire (as explained by teacher, I basically have to make fun of a topic/issue/person)
-needs to be current, but not necessarily political
-example topics were charlie sheen, or gov. of nj Chris Christie (cause were from jerz)
-im not creative, so idk what to write it on, just need an idea

[DanielEric]

A person standing on an insulated chair touches a charged sphere. Is the person able to discharge the sphere and effectively ground it? Why?

[imagirl158]

depends on what subject it is haha

[miabullitt]

I can help in chem/physics/trig or bio

[miabullitt]

A person standing on an insulated chair touches a charged sphere. Is the person able to discharge the sphere and effectively ground it? Why?

no, because since the person is standing on a insulated chair the charge cannot travel to the ground thus only interacting with the person and the sphere.

[7upyours]

I'm sure this a vague question but how do i write a research paper on a book?

[wankstaganksta]

a linear system has augmented matrix which is row-equivalent to the following matrix


a) give the values of k for which the system has
-no solutions
-a unique solution
-infinite solutions

b) for infinite solutions solve the linear system


dont think its that hard i just havent paid attention in class for a ages and dno how to do it lulz...will rep

[Brad155]

a linear system has augmented matrix which is row-equivalent to the following matrix


a) give the values of k for which the system has
-no solutions
-a unique solution
-infinite solutions

b) for infinite solutions solve the linear system


dont think its that hard i just havent paid attention in class for a ages and dno how to do it lulz...will rep

a)
- no solutions for k=0
- a unique solution for R:{k|k=/=0;k=/1}
-infinitely many solutions for k=1

b) (not 100% sure, haven't done this in a while)

x=2t
y=t
z=3t

[Karmic]

I'm sure this a vague question but how do i write a research paper on a book?

Not sure which type you are doing, but in general you write it on a specific element or theme of the book.

I.E I once did a research paper on the subjectivity of reality in Don Quixote. To write one, you must find reputable sources that help prove evidence for each part of your thesis (each paragraph), and cite them using an MLA format.

If it is just on the book itself, in total, you will have to split it into different parts. What are the themes of it? (aka is there love, loss, protagonist vs antagonist, life as a journey or path, etc) You then take citations from the pages (or lines if its a play) and use them to prove each paragraph in the format of Major (your idea) minor minor ( each one being an example citation).