The "Help Malcor with his homework" thread

[Malcor Sylverwood]

Well, with class starting two weeks from today, I'm trying to get myself ready. So, any of you who know anything about Calculus, Biology, or Chemistry sign up here so I can suck your brai--er, get help when I need it.

;) lol :D

-Malcor "Student" Sylverwood

[Anita Blake]

ummm....lessee....

Chemistry: light, air and heat are really common things that cause chemical reactions. ie, strong flavored coffee like espresso actually has less caffiene than weaker flavored, lighter roasts, because the heat of the roasting actually burns off the caffiene, while the active ingredient in marijuana, THC is actually strengthened by heat, therefore ... drinking lighter roasts of coffee will keep you more awake, and if your roommates are cooking butter that's strangely green, don't put it on your toast! (but a good malcor would not experiment with any of these theories. )

Biology: all babies start out as girls. only the defective ones turn into boys. :D

calculus: ummm.... X = something, X2 = good movie. i think. i nearly failed math. *shrugs* but i'll have you know that math was the only subject i did so poorly in. :) if not for math, i'd have been a straight A student. honest!

anita "not much help" blake

[Mike]

Bah, I'm pretty useless on just about anything :umm:

[Malcor Sylverwood]

Bah, I'm pretty useless on just about anything :umm:
Bah! If it weren't for you this thread wouldn't even exist!

[QuirkyTemplate]

I'm not good at calc, but I know it ... somewhat.

>searches for elin<

>flee<

[dark fuschia]

well I can do chemistry a little bit, although I've prolly forgotten all the basic stuff, as dumb as that sounds :-o

[Mesaana]

I can try and help with bio.. first year at least... try and enlist Amaia with that hunt too :)

Calc... I remember a bit... hrrm but Chem.. I likes chem... hehe we'll see what we can do ;) Maybe I can at least get my men on the task for you if I canna help myself.

[epiph]

i can help with literary critiques.... :umm:

[Corvus Corax]

I'd like to help, although there might be some lingual obstacles to overcome.

Would have to look over my Fourier analyses and z-transformations again, I fear, but I'd actualy like that for once. Might as well do it to help someone :)

Just ask away on anything (math, physics, mechanics,electricity, electronics,chemistry, biochem, thermodynamics, fluidmechanics, geography, history, PE :umm: , etc...) , I'll try to answer.

[Cloric the Cleric]

Well, Malc, you know my better subject are the Liberal Arts, which you probably won't have much of, but my reasoning skills are still mostly intact, so if you have anything like that, let me know.

*nods*

[dark fuschia]

Would have to look over my Fourier analyses and z-transformations again.


eeeewww!

um what? Thats all I have to say. *flees*

[Malcor Sylverwood]

OK...first day of class, come and gone. I'm tired, I'd forgotten what it was like to have to get up early, get ready, drive, and try to like think and stuff. Not to mention it was hotter than hell outside...fortunately all my real classes are in the science hall. Anyway, I feel good about Chem and Biology, we're starting off simply enough that I can get into it. Calc on the other hand...:umm: This could be trouble. I've forgotten too much algebra and FAR to much trig. Today was the algebra review...and I can stumble through a good deal of it...but tomorrow is the trig review--I think I'm in trouble. I think I need to find a 'Trig for Dummies' book pretty quick.

Anyway...lets see if this works or not. Here's a couple of the review question that I'm having some trouble with. And no laughing! :p

Solve the equation or inequality. (Find all answers)
1)
x^2 - 2x > 8

2)
x^2 - 4
------------- < 0
x^2 - 2x -3

-Malcor "Pop Quiz" Sylverwood

[Abraxas77]

eep! you've allready started class!!@#!! boy, i hope my school hasn't started yet :umm:

*runs of in a panic*

[sir archely]

oooh, i've got to try, it's been so long, but that's why it's fun! heh, math is only fun if you don't have to do it. like, i know that at any point i can just say, whatever, and give up. hehe. :D so yeah, don't trust the philosophy major to do your math for you. and someone will probably have to correct me.



Solve the equation or inequality. (Find all answers)
1)
x^2 - 2x > 8

umm...

a. x^2 - 2x - 8 > 0
b. (x-4)(x+2)>0
c. x>4 or x<-2



2)
x^2 - 4
------------- < 0
x^2 - 2x -3

-Malcor "Pop Quiz" Sylverwood

a.(x+2)(x-2)
---------- < 0
(x+3)(x-1)
b.okay, here's where this one gets fuzzy...
x|= -3 or 1 and x<-2 or x>2 ?

ah well, i tried. ~shrug~

[Abraxas77]

a.(x+2)(x-2)
---------- < 0
(x+3)(x-1)
b.okay, here's where this one gets fuzzy...
x|= -3 or 1 and x<-2 or x>2 ?


X can't be -3, but (-3+3) = 0; and 0 times anything is zero, and you can't devide by 0...nor can X=1 for the same reason. right?

oh wait a sec, by the little |= do you mean not equal....silly me...so then you're right arch...good job

[sir archely]

hehe, yeah well, i just noticed that i flipped the signs around...it should actually be (x-3)(x+1) so x can't be 3 or -1. oops.

[Cloric the Cleric]

Wow. once I realized that x^2 was x-squared, and knew that those were Quadradic....I think I actually could have done them....of course, just reading Arch's answer and then looking back over it was much simpler...

[Malcor Sylverwood]

eh, the factoring part of those isn't so bad. But the second one was a bit complicated, we went over that one today. It ended having to map out the different x value to figure out what combinations would make the whole thing work. ~nods~

Anyway...the trig review was today. Part of it came back, but its been 10 years and so much of it is memorization. So, the pre-calc test I take tomorrow...I'm going to bomb. Then I get to try to explain why I deserve to stay in Calc. :dozey:

~goes to try to cram trig~ :(

-Malcor "mmm....pi" Sylverwood

EDIT: Not fair of me to be lazy and not give the answers is it?

1)
x^2 - 2x > 8
=> x^2 - 2x - 8 > 0
=> (x+2) (x-4) > 0
(map possibities on number line--to complicated to show (2 positives or 2 negatives are greater than zero when multiplied))
x < -2 OR x > 4

2)
x^2 -4
------------ < 0
x^2 - 2x - 3

(x+2) (x-2)
----------- < 0
(x+1) (x-3)
(map possibities on number line--to complicated to show (an odd number of negatives when mulitplied/divided will be less than zero)

-2 < x < -1 OR 2 < x < 3

[Malcor Sylverwood]

And here are a couple reasons I'm going to bomb the pre-calc quiz.

Simplify
1)
sec^2 x - tan^2 x

2)
sin x - csc x
------------
cot x

-Malcor "Trigless" Sylverwood

[Mesaana]

hrrm I am remembering something and it goes like this....

1)
sec^2x=(1/cos^2x)
tan^2x=(sin^2x)(cos^2x)

therefore:
sec^2 x - tan^2 x = (1/cos^2x)-(sin^2x)(cos^2x)
can you do anything with that?? I THINK that is how it goes... would have to dredge up my old calc notes to be super sure... I may just do that

also....

2)
csc x=1/sin x

therefore:
sin x - csc x = sin x - 1/sin x

DAH!!! how could I forget trig... damnit... I should really be feeling the power of my cotan... blarg until someone tells me I am right there is a huge distinct possibility that I am full of shizznit :)

Mes "former Al-Geo Deviless" anna

[wiggin]

Heh. The way to solve those trig problems is to remember your identities. They should be in the back (or cover) of any math book, trig and up (certainly ever calc book).

The first is equal to one, because (from identities) sec^2 = 1+tan^2

The second problem simplifies to:

sin^2 - 1
---------
cos

This is equal to -1, as we all know that cos^2 + sin^2 = 1, so the numerator is -cos.

Hope this helps!

Ender

[Malcor Sylverwood]

Hmm...further update. I took my pre-calc test...and did about as well (er...poorly) as I thought I would. I got a 'passing' grade, if just barely, 66% :( The grade itself will only count as a quiz score (so like 10 out of several hundred points), so thats not a huge problem. But the prof handed back a sheet to evaluate your chances in calc. For instance, anything below 50% he basically says you have almost no chance. My grade falls into a 'borderline' area. So, basically damned if you do, damned if you don't. But, I'm counting on the fact that I'm good at math to carry me through and that its been 5 years since I've had a college algebra class and 10 since I've had any trig. ~crosses fingers~ And its not just passing the class thats important, my GPA needs to be high to keep (and hopefully gain) scholarships.

Anyway, this thread will yet turn into my school dairy, and I apologize for that. ;)

-Malcor "Between Classes" Sylverwood

[Anita Blake]

ooc malc, why on earth are you taking all the silly hard classes?! ;) calculus?! pffft. my advice, just randomly write nown letters, numbers, and symbols. *nods sagely* what are you majoring in? you should major in playdoh. it'd be much more fun. :D ;)

*realizes that might have sounded insulting but she really meant it to be cute and funny, not insulting*

-anita "nearly failed math" blake

[Malcor Sylverwood]

~chuckles~ No need to worry, lass. And Playdoh sound GREAT...sadly I don't think it will pay the bills. :( Stupid $$$ :mad:

Anyway, for the moment, I'm majoring in Chemistry. So, yeah, math and science are kind of important. ~grins~

-Malcor "The Playdoh Kid" Sylverwood

[LaughingTurtle]

Unless of course you get a job at the play-doh company ;) :D

But yeah don't worry malc....calc is bad but it's definitely not the worst and if ever in doubt on a test just put the tried and true "42"....let the professor argue against that! hehe...hehe...hehe...yeah....heh....yeah.... :umm:

[Alexia]

Oh Malc - I wish I could help you, but like I think I've told you before - the Maths/Science area is not my deal. All those numbers and stuff (while they still look pretty neat) just confuse the googly out of me, so I'll have to pass on that one. But any English/History/Legal stuff and you know where to find me! :D

[wiggin]

Cheer up, Malc! Calculus is oodles of fun, when you get in to it. You'll need to freshen yourself up on some stuff (most importantly trig, I'd guess), but it really isn't too bad. I'm sure you'll do fine.

Nonetheless, if you need any help (particularly on math), feel free to PM me (wotism is best, but here might work), or grab me in chat. I'll try to check here every now and then. I know calc through multiple integral calculus (and some complex calc, but don't count on it), and I'm pretty decent at Chem through the end of Organic, Bio through basic biochem/molecular biology, introductory college physics for engineers (you probably won't need anything beyond this), and various other technical subjects. So if I have the chance, I can try to help whenever possible.

Good luck!

Ender

[Malcor Sylverwood]

Thanks, wiggin. Its much appreciated. And depending on how things go, I may very well take you up on your offer. :)

Lets see...your Calc will be more than I need, at least for the Bachelors. I just need Calc I and II. Physics, I'm required to have I and II. Biology? It depends on which path I decide to focus on, I really don't want to go down that path, so probably not much. And hopefully I won't need TOO much help in Chem...if I do, I need to change majors ;)

-Malcor "Dedicated" Sylverwood

[wiggin]

Heh. My physics should be sufficient - mechanics, kinematics, hydraulics, optics, E&M, and the basics of modern physics. :p Chem, though, I hated. So you probably shouldn't ask me anyways. :)

Ender

[Malcor Sylverwood]

Just for reference...here's the courses I'm required to have...plus a couple of general classes that I'm mostly to lazy to look up ;)

Required Associated Courses (20 hours):
MA 161 Calculus I 5 hours
MA 262 Calculus II 5 hours
PH 190-192 Physics I Lecture, Recitation, & Lab 5 hours
PH 193-195 Physics II Lecture, Recitation, & Lab 5 hours

Major Area Required Courses (46 hours):
CH 123-124 Chemistry I & Lab* 5 hours
CH 126-127 Chemistry II & Lab* 5 hours
CH 376-377 Quantitative Analysis & Lab 5 hours
CH 479 Undergraduate Research 1 hour
CH 525 Descriptive Inorganic Chemistry 3 hours
CH 560 Biochemistry 3 hours
CH 572-573 Organic Chemistry I & Lab 5 hours
CH 574-575 Organic Chemistry II & Lab 5 hours
CH 720 Physical Chemistry I 3 hours
CH 721 Physical Chemistry Lab 2 hours
CH 722 Physical Chemistry II 3 hours
CH 730 Seminar in Chemistry 1 hour
CH 777 Instrumental Analysis 5 hours

For a non-certified degree, one advanced elective must be chosen from the following:
CH 724 Topics in Physical Chemistry 3 hours
CH 725 Advanced Inorganic Chemistry 3 hours
CH 760 Advanced Biochemistry 3 hours
CH 772 Topics in Organic Chemistry 3 hours

In order to earn an ACS-certified BS degree, three advanced electives must be chosen as follows:
CH 725 Advanced Inorganic Chemistry 3 hours
CH 726 Advanced Inorganic Chemistry Lab 2 hours
CH 723 Advanced Physical Chemistry Lab 2 hours
CH 724 Topics in Physical Chemistry 3 hours
CH 760 Advanced Biochemistry 3 hours
CH 772 Topics in Organic Chemistry 3 hours

-Malcor "Classload" Sylverwood

[wiggin]

Heh. Well, I can't help on any of the really advanced Chem stuff (like physical chem, or advanced inorganic), but all of your basics I've taken. And classload? Bah! Let me try to approximate what I'm taken/taking:

(we're on quarters, to three classes is a year of classes)

Engineering Analysis I-IV
Engineering Design and Communication, I-II
Applied Calc I-IV
ODEs (actually, part of EA)
Gen. Chem. I-III
Orgo I-III
Genetics/Evolutionary Bio
Biochem/Molecular Bio
Biostatistics
Thermodynamics
Fluid Mechanics
Physics II-III (Physics I covered in EA)
Intro to EE
Circuit Analysis
Intermediate Fluids
Biomedical Engineering Lab
Biomedical Engineering Design
Tissue Engineering
Artificial Organs
Biomedical Signals and Systems
Systems Physiology II-III
Materials Science
Biomaterials and Medical Devices
Cardiovascular Instrumentation
Independant Research (probably about 4 quarters worth)

Oh, that's what I can think of off of the top of my head. *chuckles* I have lots of stressful quarters.

Ender

[Malcor Sylverwood]

heh...I never claimed mine was the worst or the hardest even...but right now, just beginning again, it seems overwhelming. Its been 6 years since I finished my last bachelors (Computer Information System). So, yeah. And, that list is just for the bachelors in chemistry, of course, and I'm almost sure I'll be working to my masters...and maybe more. ~shrugs~ The future is uncertain, and all. ;)

-Malcor "Beginner--again" Sylverwood

[Mike]

You people are scaring me ~nods~

[wiggin]

You people are scaring me ~nods~
Oh, come now. The classes sound much harder than they are. Honestly. I think there is a division at Northwestern whose sole purpose is to think up scary-sounding course names.

Ender

[QuirkyTemplate]

heh, Ender, at first I thought you were listing all the classes you were taking in ONE quarter! I was thinking, "Aww bs! No one is that hardcore!" But ah ... in a year, okay, that makes sense. Still ... that does seem hardcore. And you don't have to take any humanities in there?

[Fencing Fool]

yay, I get to use my micro training for something! :)

I'm pretty strong in Bio and Chem. For Calc, though, don't look at me. Fortunately, you seem to have enough help in that area. ;)

[Waffles]

Ummmm.... well I sorta majored in Advanced Maths.... so if you have any questions, chances are I can answer them :blush: Or Elin :p

[wiggin]

Well, no, those are the courses I've taken so far that were relevant, or those I plan to take in the next two years that are relevant. Well, the ones I remembered. I have taken a FEW pseudo humanities... let me look.

Well, a few:

Public Speaking (joke)
Microeconomics (joke)

Um. That's it. I have to take three more humanities (out of 48-55 total courses). Probably a british history, a shakespeare class, and something else. All jokes. Engineering classes make this sort of stuff a breeze. :p

Ender

[Jennifer]

~looks at Malcor's classload~

Heh, my organic chemistry professor once tried to talk me into switching my major to chemistry. NOW I remember why I ran from his office screaming.

I don't see anything there I could possibly help you with. The only classes I see there that I took were calc, physics *shudder*, and organic chem. (I wouldn't even come near the biochem profs at my school).

So, yeah, I'm pretty useless. :D

[Malcor Sylverwood]

So, yeah, I'm pretty useless. :D
Never. There's always moral support, which I'm sure I'll be needing. :)

Hey, I got a 9.5/10 on my Calc quiz! There may be hope yet! :D

-Malcor "Hope springs eternal" Sylverwood

[Jennifer]

*cheer4Malcor*

And I'm always up for a little moral support. ;) :p

Anyhow, I remember back in HS, my chemistry, physics and calculus classes were utter jokes. I swear I made half-cracked guesses on all of the tests (multiple choice :rolleyes: ), and somehow I still got B's in all three classes. Go figure. So when I actually got to college, I had to learn everything like it was brand new. 'Twasn't fun...

[Malcor Sylverwood]

hmm...well, i had two fairly successful quizzes in calc...but oh not so much on the last one. And now we're moving onto inverse functions and, of course, logarithms. And I'm just not getting my mind around the whole log thing yet. I can read it or hear it in class, and it makes sense. But then I go to try to apply it and...well...understanding? Not so much.

-Malcor "Back to studying" Sylverwood

[WolfBrother]

If you need any help with homework. You probably shouldn't ask me. Just so ya know. I was terrible in school.


However


If you need help learnin' Sabin's blitz moves. Or need to know how to beat that damn earth fiend in Final Fantasy. I'm your man. ;)

[Malcor Sylverwood]

yay! I figured out one of the things I know I missed on the quiz...it seems so simple now.

Basically, knowing the general formula for an exponential funtion is y=C(a^x), find the equation for a function that passes through (1,6) and (3,24). So...

6=C(a^1) and 24=C(a^3)

I solved the second one for C: C=24/(a^3)

Plug that into the other equation and solve for a: a=2

Plug that a value into either equation to get C: C=3

And done! y=3(2^x)

~nods~

-Malcor "One done, a million to go" Sylverwood

[wiggin]

Congrats! I've found that the best way to do logarithms is think of it this way:
log(b) x = y means that the yth power of b is x. I know, it's just the definition, but I always have that sentence tucked away in my head, so that makes it easier. :)

Ender

[Malcor Sylverwood]

~gulp~

Calc test tomorrow...two hours of pure hell. heh, in context, I've been doing ok on the quizzes, but having random problems throw at me might be another problem all together.

So, I need to study tonite...in theory :umm Esp logarithms and some of the trig, I think.

-Malcor "f(x)" Sylverwood

[~KA3AK~]

Calc is not so bad, but Differential equations...well, technically they are not so bad either, but I'm suck of having to do so much homewok.

[wiggin]

G'luck, Malc. Hope you do well.

Actually, I'm doing a bit of a review of calc and such myself, as I'm going to be tutoring undergrads, most likely. Heh.... me, a teacher. *chuckles* Poor kids...

Ender

[QuirkyTemplate]

Come come now, who wouldn't die to have the great Ender Wiggin as a teacher?

[lakai]

Well Malcor if I do remeber right you were one of the smartest kids in school. So if You need help with your homework I am so afraid that there is no hope for the rest of us. But I guess that never stopped me from trying.

[wiggin]

Hell, I need some help. Anyone know advanced applications of fluid dynamics? I'm a bit out of my league... the class is half grad students, and he said that homework will take at least six hours a week. Any help would be appreciated...

Ender

[Fencing Fool]

hmm, fluid dynamics.....

I know that if I put a straw in a glass of water and draw the air into my mouth, the water happens to rise up after it. Does that help?




:p

[Alexia]

Hell, I need some help. Anyone know advanced applications of fluid dynamics? I'm a bit out of my league... the class is half grad students, and he said that homework will take at least six hours a week. Any help would be appreciated...

Ender

Six hours each week? Isn't that normal? :umm:

Oh, and sorry I can't help, sugar. Stuff like that is WAY out of my league. *mind explodes* Woah! :dozey:

[wiggin]

Not normal for this class, Alexia. Since NU classes are on average more hours per week (I've had quarters with 30 hours of class a week) than other schools, the homework tends to be harder, but shorter. Here, it's harder AND longer. Let me examine my time budget:

Class: 20 hours
Work: 8 hours
Tutoring: 6 hours
Lab research: 10 hours
Studying (including readings and such): 20 hours (30 or so during midterms)
Homework (including papers): 10-20 hours

So, on a minimum estimate, 74 hours a week. Plus shopping for the apartment, band practice/gigs, chores, etc. :p

Anyways. FF, your help was invaluable.

Ender

[Alexia]

Not normal for this class, Alexia. Since NU classes are on average more hours per week (I've had quarters with 30 hours of class a week) than other schools, the homework tends to be harder, but shorter. Here, it's harder AND longer. Let me examine my time budget:

Class: 20 hours
Work: 8 hours
Tutoring: 6 hours
Lab research: 10 hours
Studying (including readings and such): 20 hours (30 or so during midterms)
Homework (including papers): 10-20 hours

So, on a minimum estimate, 74 hours a week. Plus shopping for the apartment, band practice/gigs, chores, etc. :p

Wow. *notes greater respect for people who do so much PLUS science-related work* I see the issue now. Well, good luck, mate. *mind is blowing* I think I'll run away now. :p

[Malcor Sylverwood]

How about chemistry? Balancing Redox reactions?

AlCl3(s) + Na(s) --> NaCl(s) + Al(s)

KClO3(s) --> KCl(s) + O2(g)

-Malcor "Chasing electrons" Sylverwood

[sir archely]

Are you asking about these? cause...isn't it just like this? i think maybe there's something i'm missing...but that portion is fogged over. heh.


AlCl3(s) + 3Na(s) --> 3NaCl(s) + Al(s)



2KClO3(s) --> 2KCl(s) + 3O2(g)

[Malcor Sylverwood]

No, no...thats simply balancing them as a standard chemical reaction. Balancing redox reactions involves chasing down electrons...

-Malcor "Reduction in the lost and found" Sylverwood

[sir archely]

yeah, see i knew i was missing something.

heh...thanks for letting me know just how much i've forgotton over the years.

i vaguely remember setting up electron 'rxns' but that's about it.

-sir "philosophy major" archely ;)

[Buck]

*swings in to the rescue*

It is I chemistry Dorkus :D

Arch is right above. Those are balanced both stochiometrically and electronically.

ex/

AlCl3 is a neutral species with a Al+3 and 3 Cl -1 => -3 so AlCl3 is neutral and Na(s) is also neutral. So the left side is neutral.

On the right side the same logic applies... 3 NaCl but each Na is a + and each Cl a -. So +3 -3 = 0 and Al(s) is neutral so the right is neutral so that satisfies the charge.

Now if you want the NET equation... that would be whatver changes you keep, in this case keep it all.

[~KA3AK~]

I'm not an expert on science, but shouldn't chemistry be already integrated into physics? I mean, chemistry started out as a separate science because physics could not explain the structure of atom and stuff. However, now physics can be used to explain all of the stuff that chemistry does.

[Malcor Sylverwood]

hmm...yes, both sides are net neutral, but we're being taught to balance these redox equations somewhat differently...so I don't think that's right. The steps to balancing these things takes up an entire page ;) I'd walk through one of the examples I have, but the difficulty in sub/super scripting would make it difficult. So, I'll just give the question and see what answer you come up with.

KIO4 + KI + HCl --> KCl + I2 + H2O

-Malcor "Oxidation in the lost and found" Sylverwood

[~KA3AK~]

Man, the las time I took chemistry was my freshman year of high school, 5 years ago. Anyway, I can still balance it, think. How's this:

2KIO4 + 14KI +16HCL --> 16KCL + 7I2 + 8H20

KA3 "boneheaded apprentice" AK :D

[Buck]

Man, the las time I took chemistry was my freshman year of high school, 5 years ago. Anyway, I can still balance it, think. How's this:

2KIO4 + 14KI +16HCL --> 16KCL + 7I2 + 8H20

KA3 "boneheaded apprentice" AK :D
You made a booboo... You have 16 I's on thge left and 14 I's on the right.

It's

KIO4 + 7KI +8HCl >>> 8KCL +4I2 + 4H20

But I think learning how to get it is more important than getting it :p

Method:

Count up how manyOxygens you need cause thats the hardest one to make up for.

You need 4 on the right so 4 H2O's
That tells you howmany HCl's you need on the left

4 H2O's is 8 H+'s so 8 HCl

That leads to 8 KCl and finally 7 KI cause 1 KIO4 exists... so meh ;)

[~KA3AK~]

True, I knew it didn't look right. I made a mistake copying it on my paper where I balanced it, I had just KO4 written down instead of KIO4. I should have noticed that K is only +

[lakai]

True, I knew it didn't look right. I made a mistake copying it on my paper where I balanced it, I had just KO4 written down instead of KIO4. I should have noticed that K is only +

I know that all this is interesting but I thought that the idea was to help Malcor with his homework.

[Buck]

I know that all this is interesting but I thought that the idea was to help Malcor with his homework.
Umm I though the walkthrough helped :confused:

[lakai]

Umm I though the walkthrough helped :confused:
I am sure it did help I was just confused and though that you were discussing other things other than his actual homework

[wiggin]

Malc, you are right. The actual procedure is more complicated. Once my comp has a monitor and internet connection, I'll pull a chem text and my notes off of a shelf and give the full length explanation. Your teacher/book's method is probably right, although complicated.

Also, note that while SOMETIMES balancing it stoichiometrically can work in redox reactions, this is often NOT the case.

I'll try to write it up soon, but my life has gone and gotten complicated.

Ender "Why the hell did I go and invite a dozen people over for dinner?" wiggin

[sir archely]

i'd just like to announce that i'm sorta recalling something about half reactions, and charges. i think if i remembered the charges of stuff, i might actually be able to do some of those. i'm just announcing that because i'm proud that my brain worked at it while i was doin' other stuff. :D good ole brain.

[~KA3AK~]

I know that all this is interesting but I thought that the idea was to help Malcor with his homework.
Yea, I sorta get carried away all the time... :umm:

[Malcor Sylverwood]

Malc, you are right. The actual procedure is more complicated. Once my comp has a monitor and internet connection, I'll pull a chem text and my notes off of a shelf and give the full length explanation. Your teacher/book's method is probably right, although complicated.

Also, note that while SOMETIMES balancing it stoichiometrically can work in redox reactions, this is often NOT the case.

I'll try to write it up soon, but my life has gone and gotten complicated.

Ender "Why the hell did I go and invite a dozen people over for dinner?" wiggin
~nods~ Most of them, with the instructions in hand, I can walk through easily enough. However, the first 2 I listed don't exactly seem to fit, so I'm not so sure about it. I'll try to post the answer to that last one after class today. And, yeah arch, half reactions and adding electrons and all that. ;)

-Malcor "Shh...I'm hunting electrons" Sylverwood

[Buck]

Ahhh half reactions then I guess you want the last one boiled down to

I(7+) + 7I(1-) ------> 4 I2

The half reactions i guess would be:
I(7+) + 7e's -------> 1/2 I2
7I(1-) --------------> 7/2 I2 + 7 e's

The trick in figuring out the oxidation states is to see that K is always +1
So all of IO4 must be -1
Each O is -2 so Iodine must be +7 for the overall anion to be -1.
This I is being reduced to I2 (from +7 to zero)
The other I in KI is getting oxidized to I2 which is its elemental. (from -1 to zero)

Hope that helps.

[Buck]

AlCl3(s) + Na(s) --> NaCl(s) + Al(s)

And as for this one, ... now that I know what you meant (thx to arch) I can help you here too..


AlCl3 looking at it closely you see that the Cl 's are -1 each so Al has to be +3

Na (s) is in its elemental for so ... (zero)

NaCl salt the Cl is still (-1) so discard that one.
But wait the Na is +1 now. :umm:

The Al(s) is in its elemental form too. .. *sigh* so its (zero) now.

So righting the half rxns

Al(+3) + 3 e's---------> Al (zero)
Na (zero) -------------> Na+ + 1 e's (but you need 3 e's :eek:
Giving the net redox you multiply the second one by 3...

Al(+3) + 3Na (s)-----------> Al(s) + 3 Na(+)

[Dregs]

I'd just like to point out if you ever need any help identifying Australian riverine frogs, or restoring riparian habitat, I'm your man.

Dr "Maths gives me Windows Brain" egs

"Your Brain has performed an illegal function and has been terminated"

[Jennifer]

lol, dregs...God bless statistics programs

~runs out of thread before the chemistry melts her brain~

[wiggin]

Mmmm.... SPSS.... mmmm....

and mmmm.... matlab.... mmmm. Even Mathematica. :)

*loooooves using computer programs worth thousands of bucks*

Ender

[Malcor Sylverwood]

Well, pre-enrolled for the spring semester...no big surprises....Calc II & lab, Chem II, and Physics I & lab. Thats 15 hours...about 20 contact hours...I need to look through the class offerings to see if I can't find something to fit in there...Tuesday will suck under this schedule...7am to 4pm...not all in class of course, but as long as I'm driving back and forth, might as well be :umm:

-Malcor "Mileage" Sylverwood

[Malcor Sylverwood]

~blatantly ignores the fact he said he'd balance some redox reactions~

Anyway, I'm wishing I had bought a lottery ticket on Monday. 'Why?' you might ask...Well, I had a biology test. As I was taking it, I kept a rough estimate of how many questions I was pretty much guessing on, and that total came back at around about 15 (out of 50 question. Well, its a multiple choice test, so I figured I'd get some share of those right...but not 14 of them...hehe. Compare that to the 2 I missed on the rest I thought I knew...lol

-Malcor "No complaints" Sylverwood

[Malcor Sylverwood]

Oh yes, fun week. At the end of the week a have a test. What my calc prof calls a 'gateway exam'. The way I have it figured, is its a 10 question test. The problems will all be finding derivitives. Not so bad, right? Well, the gateway part means that its graded simply pass/fail. You need to score 9/10 to pass and you need to pass the exam to pass the class. wee

~sighs~ Back to studying...

-Malcor "Keymaster" Sylverwood

[wiggin]

Umm.... PLEASE tell me that someone here knows applications of fluid dynamics. I really, really need some help. I've been breaking my head on these homework assignments for hours (I'm talking about 3-4 hours a DAY), and getting precisely nowhere. Can anyone help? The assignment is at the link below.... Prob. 2 I sort of have done, but 1 and 3 are up in the air. Anyone?

http://pubweb.nwu.edu/~sau108/22.pdf

Ender

[wiggin]

Well, it's a moot point now. :) I handed it in today... after four of us had a 4-hour power fluids session in which we managed to cobble together a few answers. But in the future, does anyone know this stuff?

Ender

[Malcor Sylverwood]

Well beyond me, I'm afraid. I'm having trouble right now remembering the derivitives of the trig functions. Must memorize by friday. :mad:

a(x)=sin(x)
a'(x)=cos(x)

b(x)=cos(x)
b'(x)=-sin(x)

c(x)=tan(x)
c'(x)=sec^2(x)

d(x)=sec(x)
d'(x)=sec(x)tan(x)

e(x)=csc(x)
e'(x)=-csc(x)cot(x)

f(x)=cot(x)
f'(x)=-csc^2(x)

:dozey:

-Malcor "bah" Sylverwood

[wiggin]

Heh, I just was tutoring someone who didn't know their trig identities by heart. I was shattered - those are crucial to most problems.... as it was to the one she was stumpted on. :)

Ender

[Malcor Sylverwood]

umm...trig identities...I know one...I think....

sin^2 + cos^2 = 1

~chuckles~

Anyway, here's the belated midterm report...All A's except for Chem Lab which is a B+ :umm: Oh, and my PE final grade hasn't come in yet...

So far, so good ;)

-Malcor "No 4.0" Sylverwood

[Jennifer]

Well, it's a moot point now. :) I handed it in today... after four of us had a 4-hour power fluids session in which we managed to cobble together a few answers. But in the future, does anyone know this stuff?

Ender

Sorry wiggin, but I've effectively purged all but the most basic understanding of Physics from my brain. It's helped with the twitching a little... :umm:

[Malcor Sylverwood]

~dusts off his old neglected thread~

hrm...I'm having to spend this weekend studinging calculus...as we have a test on tuesday, and I'm really, REALLY lost.

~sighs~

I can't even ask for help, because I'm not sure enough of what to ask...heh. I guess its not so bad, I've sat down with the book and have made some headway...wish me luck

~smites integrals~

-Malcor "Calc II-fah!" Sylverwood

[Amelia]

Good Luck!

**gives Malc a toussel and inspiration**

[wiggin]

Good luck indeed! If you need any questions answered, feel free to IM/ICQ me (erm... ask satan for them if you don't have them already... I'm paranoid, don't post them publicly). I remember most of this stuff (and hey! I'm tutoring calculus and science and diffeqs and engineering and stuff this year, so I might even be decent at explaining).

Enjoy your test.

Ender

[Waffles]

You can ask me too.... I was an advanced maths major at uni :)
(Can you believe I finished my main degree over a year ago now? Wow....)

[Malcor Sylverwood]

Alright...here's one...I need to know if (and how to figure it) the sum from 2 to infinity of ln(n/(n+1)) converges or if it diverges...

:confused:

[Dregs]

Eew. Wouldn't the log of a small number approach 0?

[Radar]

gah, this is what i get for not taking calc for a year

[Malcor Sylverwood]

yeah...but its a little more complicated...for instance the sum from 1 to infinity of 1/x diverges...even tho 1/x approaches zero as x approaches infinity...

[Radar]

gah, sorry, ignore that previous post.... if the intergral of the function over the range 2 to inf. approaches a finite number then it will be convergent. If not then divergent soo.... (is trying to figure it out integral of ln(n/(n+1) )

[Malcor Sylverwood]

Yeah, I tried that too and got lost...there are other tests, but I didn't have a lot of luck with those either ;)

[Radar]

i just keep getting stuck on the integration .... it has to be done by parts but i keep messing up the derivitave of ln( n/n+1)

[LaughingTurtle]

Heh think I fell asleep during natural logs...

So glad I don't have calc anymore but then it's one of those out of the frying pan and into the fire deals...bah!

[Waffles]

Tsk tsk tsk :p

A series is convergent if and only if the correspoinding sequence of partial sums is convergent.

Now, ln(n/(n+1)) = ln(n) - ln(n+1).
Therefore sn = (ln(2) - ln(3)) + (ln(3) - ln(4)) + ... + (ln(n) - ln(n+1))
sn = ln(2) - ln(n+1)

Now, we can see that since sn is NOT convergent, that the corresponding series is also not convergent, and is thus divergent.

[Dregs]

he was later lynched by other scientists who had been trying to make the generator for years, who finally worked out that what they really couldn't stand was a smart-arse.
:dozey: :p

[Waffles]

:p

I was just trying to help!

And I was tsking LT :p

[Buck]

Oh yay, Does this mean we may commense withg the lynching of waffles? :D

[LaughingTurtle]

Naturally!

Tsk me will you...

~passes out pitch forks and torches to gathering lynching mob~

[Apoc]

~stands by waffles~

~draws lightsaber on approaching lynch mob~

There will be no lynchings on this occasion, you may return to helping malcor with his homework now!

[Waffles]

My hero :love: :toussel:

[LaughingTurtle]

~said mob mocks apoc with for having a plastic lightsaber (but with real movie sounds!TM) then retires to helping malcor with his homework~

Bah, fickle mobs...they just don't form em like they use to.

[Radar]

well im sorry that us mobbsters felt that the contracted mob rate was a little low, we have rights too you know ;) :D

[LaughingTurtle]

The day the mob unionizes, is the day I ...er no, quirky eats his top hat - if he has one that is, and only if he is provided with ample amounts of worcestershire sauce and creamy nougat.

~nods~


~flees thread before malcor becomes upset~ ;)

[Malcor Sylverwood]

~begins deleting and banning at random~

:p

And...thanks, WFFS, I'm not sure thats exactly what I was looking for, but its more than good :D

[wiggin]

Well, it looks like Waffles has things well in hand, so no need for me to bother with it... ;)

[Malcor Sylverwood]

My class schedule for this fall...just so you can all brush up on things and are ready to help me ;)

Organic Chem I
Descriptive Inorganic Chem
Physics II
Intro to Geospatial Analysis

[dark fuschia]

Chemistry.. uh physics? I'm sorry I think I wandered into the wrong thread. *ducks out again shyly*

oh but..

*Sticks head back in again quickly* NO calculus! Nice one malc! *high fives then flees again*

[wiggin]

Cool! I can help with the Orgo and Physics...

Do I get to post my schedule for this fall when I register?

Ender

[Radar]

Whats the difference between Descriptive Inorganic Chem and regular inorganic chem? do they just make up more big words or someting?

[Malcor Sylverwood]

CH525 DESCRIPTIVE INORGANIC CHEMISTRY, 3 HOURS. (PREREQUISITES, CH126 AND CH127 OR EQUIVALENT.) THE PROPERTIES AND REACTIONS (DESCRIPTIVE CHEMISTRY) OF INORGANIC ELEMENTS AND THEIR COMPOUNDS AND THE PRINCIPLES, TRENDS, AND PATTERNS OF INORGANIC CHEMISTRY ARE STUDIED. THESE TRENDS ARE USEFUL FOR PREDICTING AND EXPLAINING HOW AND WHY REACTIONS OCCUR INVOLVING INORGANIC SPECIES IN AREAS SUCH AS BIOCHEMISTRY, SOLID STATE CHEMISTRY, AND GEOCHEMISTRY
heh, my understanding is the general organic chem classes are about more broad topics (reaction kinetics, thermodynamics, and things like that)...descriptive is more about specific elements and compounds and how they tend to react.

-Malcor "Thats my story and I'm sticking to it" Sylverwood

[Malcor Sylverwood]

*Sticks head back in again quickly* NO calculus! Nice one malc! *high fives then flees again*
hehe...actually, of all things, I'm trying to talk my advisor into letting me take Calc III...before I forget EVERYTHING I learned in I and II...

We shall see...

-Malcor "Doh" Sylverwood

[wiggin]

Yay! Calculus rules. I was just tutoring someone today on Line Integrals, and I realized how much I love them. *smiles blissfully*

Ender

[wiggin]

So what I think I'll be taking next year (anyone wanna help me? ;) ):

BME 308 = Biomedical Engineering Lab (essentially, a hands-on applied engineering design class that's hellishly difficult)
BME 343 = Biomaterials and Medical Devices
ES_APPM 311-1 = Applied Complex Calculus I

And some as-yet undetermined fourth class, probably something stupid to fulfil my "fine arts and literature" requirement. Or there was this interesting-looking cognitive science class I saw...

And I'll probably do research, too. Getting published would do wonders for my grad school applications.

Ender

[Malcor Sylverwood]

Since this thread is about me and not wiggin's sheer genius :p

I am, for the moment, enrolled in Calc III :umm:

-Malcor "Wing and a prayer" Sylverwood

[Molimo]

So what I think I'll be taking next year (anyone wanna help me? ;) ):

BME 308 = Biomedical Engineering Lab (essentially, a hands-on applied engineering design class that's hellishly difficult)
BME 343 = Biomaterials and Medical Devices
ES_APPM 311-1 = Applied Complex Calculus I

Ooh, I will! My proficiency with... uh... biomaterials... is legendary. ;)

Speaking of math courses, I'm going to have a difficult decision coming up. Due to a whole ton of wierd things and a horrible person who needs a swift but painful death in the Netherlands somewhere, I am going to have to take a course in "Discreet Mathematics" in grade 11. Anyone know what that is? My only guess so far is math that doesn't go out of its way to get noticed, but that made no sense so I came here :p

[wiggin]

I'm guessing you need to take Discrete Math. ;) It's cool stuff.

Ender

[Amelia]

Math is a hard subject for me. I can only learn so much per day. I remember on some days in Algebra I would get the "math headache" and just rest my head on the table, but I would still watch but I was done learning. Then after the class was over for the quarter we took the teacher for a beer and he told us "I knew Amelia was done for the day when I looked over at her and I just saw hair" I have really long hair. It was funny we all laughed but it was so true!

[AquaFizz]

Math is a hard subject for me. I can only learn so much per day. I remember on some days in Algebra I would get the "math headache" and just rest my head on the table, but I would still watch but I was done learning. Then after the class was over for the quarter we took the teacher for a beer and he told us "I knew Amelia was done for the day when I looked over at her and I just saw hair" I have really long hair. It was funny we all laughed but it was so true!
~just sticks her nose in anywhere, cuz she's freakin' bored.~ Yeh...It took me 2 and a half years to pass algebra in High School. I avoided taking math in Comm. College this year, and now i'm regretting it because I'm going to have to take something this year at my "smart people go herre" University. Ima DIE!

[Malcor Sylverwood]

This is officially a bump. ~grins~ Just getting ready and warning you all again. :D

-Malcor "Needy" Sylverwood

[Lilith]

i know i've said this before... but i hate math. been putting it off forever... sooner or later it will catch up to me. i didnt always hate it, i was actually very good in junior high, but the LAUSD system which is all screwed up, screwed me up. :kill:

[wiggin]

When my computer is back in working order (Tuesday night, I hope)... I'll be available again for this sorta stuff. Math, science, engineering, etc, etc. Sorry I can't help much on lit papers, aside from correcting spelling and grammar, though. *grins*

I should charge for this - I certainly do that for my tutoring IRL... ;)