Science & Mathematics - 21 September 2007

(Type your answer using the format Pb3(PO4)2 for Pb3(PO4)2. If no precipitate forms, enter 'none'.)
(a) FeSO4 (aq) + KCl (aq)
(s)
(b) Al(NO3)3 (aq) + Ba(OH)2 (aq)
(s)
(c) CaCl2 (aq) + Na2SO4 (aq)
(s)
(d) K2S (aq) + Ni(NO3)2 (aq)
(s)

2007-09-21 10:50:00 · 3 answers · asked by Anonymous in Chemistry

i would like to know how to construct:
45 degree angles
105 degree angles
75 degree angles and
90 degree angles
can anyone please give me the rules of how to construct those angles or lead me to a website which will help me??i really need help thanks

2007-09-21 10:47:33 · 2 answers · asked by !urbeauty! 3 in Mathematics

Why is it that water holds the H- molecules down at an angle like a triangle while CO2 holds the O2 at 180 degrees from one another with the carbon in the middle??

2007-09-21 10:47:29 · 1 answers · asked by Anonymous in Chemistry

usage of inverse function? What are the applications in real world

2007-09-21 10:44:29 · 4 answers · asked by c.wijaya 2 in Engineering

You hear it all the time on TV like "ER," but I've never heard what they stand for. They'll say something like I need 100 cc's of whatever, a cbc, and some other orders....

2007-09-21 10:43:40 · 9 answers · asked by First Lady 7 in Medicine

As discussion grows on the subject, Mars is the most hospitiable planet within our range for humans to inhabit. The question is, will we ever?

2007-09-21 10:40:22 · 6 answers · asked by Pure Genius 1 in Astronomy & Space

a.) HNO2
B.)HCN
c.) Ca(OH)2
d.) CH3CO2H

2007-09-21 10:36:12 · 3 answers · asked by ladypolars32 1 in Chemistry

how many moles of CO2 can be produced from 2 moles of C3H8?

C2H8 + 5O2 -----> 3CO2 + 4H2O

2007-09-21 10:34:42 · 3 answers · asked by blueeyegreen 1 in Chemistry

2007-09-21 10:34:22 · 1 answers · asked by Anonymous in Earth Sciences & Geology

im not sure why am asking this here but what ever

2007-09-21 10:33:52 · 3 answers · asked by lisa 1 in Zoology

i was wondering what it will take to create a control module(i call it that because i dont know what else to call it) that can move a actuator up at the push of a button or down at the push of a diffrent button. also light a indicater light to tell what postion that actuator is in I.E
:postion 1 full closed
:postion 8 full extented.

2007-09-21 10:32:47 · 2 answers · asked by andrew00perez 1 in Engineering

F(x)=(x^2+5x-24)/(3x^2-5x-28)

So far, all I've gotten is for (x^2+5x-24) to equal (x-3)(x+8) and now I'm stuck. Any help is appreciated. Thanks.

2007-09-21 10:28:52 · 3 answers · asked by Glenn M 1 in Mathematics

Or are some only limited to other plants, etc.? examples of each?

2007-09-21 10:24:57 · 1 answers · asked by wilyum 1 in Botany

Any stories floating around about this place? How do you know or why have you come to believe that it is a "really spooky place"...and do many others nearby think the same as well,and what stories go around about this place and why?

thanks!

2007-09-21 10:17:45 · 10 answers · asked by ladyk 2 in Paranormal Phenomena

2007-09-21 10:15:26 · 10 answers · asked by triffid 1 in Astronomy & Space

2007-09-21 10:14:29 · 11 answers · asked by ms_robinson2430 1 in Astronomy & Space

Points are A (0,0) B (18,0) C (6,12)
Intersection of point of medians:
This point is called the ___________of the triangle.
Intersection point of the altitudes:
This is called the______________of the triangle.
Intersection point of prependicular bisectors:
This is called the ___________of the triangle.
DO not understand the questions.

2007-09-21 10:11:20 · 1 answers · asked by Karen R 1 in Mathematics

please explain

2007-09-21 10:10:45 · 3 answers · asked by PiNk-PrInCeSs 3 in Chemistry

y = sin^(2) x
y equals sine squared x

How do you find the derivative of this? Please show process.

2007-09-21 10:09:44 · 4 answers · asked by Anonymous in Mathematics

In my organic chem. class today, the prof. called a cyclohexane a hexane. That confused me. So I was wondering, what's the difference between hexanes and cyclohexanes?

2007-09-21 10:07:14 · 5 answers · asked by Mimi 1 in Chemistry

I am not too sure on how to factor this. i thought maybe case 2 factoring but i don't remember how to do that so if someone could show me the steps for case 2 factoring or how to factor this polynomial that would be great.

2007-09-21 10:05:05 · 8 answers · asked by Anonymous in Mathematics

2007-09-21 10:00:26 · 5 answers · asked by kachilous_2002 1 in Mathematics

2007-09-21 09:59:41 · 8 answers · asked by andrew r 1 in Engineering

The options for the answer is -3/2,3/2,-2/3,2/3. Do you know the answer???????

2007-09-21 09:52:59 · 8 answers · asked by Anonymous in Mathematics

I know water spins around the plughole the other way in the southern hemisphere due to the Cornetto effect but does the poop shoot voofoo valve also twist in the opposite direction for Antipodean dwellers. I always like to try for a nice even right hand thread before I nip one off.

2007-09-21 09:51:15 · 4 answers · asked by Anonymous in Physics

Ive always wondered this, and im sure i could look it up, but its easier having it explained. I no like music boxes and records work by plucking shards of metal or grooves on a record in precise sequences to produce minute sound that together produce tunes. But with todays speakers and headphones, What is it inside thats Actually creating the sound of human voices and music, and etc. What contact or actuall physical things is producing the sounds? Im sure once i learn it it will seem very clear how it works. But still its just amazing thinking we started as monkeys on a planet, and have used this planet to make things that can do what some of the things today can do. a testament to our ingenuity. but I still think we could be alot farther than we are. sigh.

2007-09-21 09:50:35 · 1 answers · asked by The Prodigy 2 in Other - Science

Someone told me I need a positive voltage source to perform mesh analysis on this circuit:

http://img260.imageshack.us/img260/4665/deletemecircuituz9.jpg

Is this true?

I don't see how the voltages in the outer loop can add to 0.

I've solved this with nodal analysis but have not been able to with mesh analysis yet. The equations I've come up with are:

(both currents assumed clockwise)

i2 - i1 = Va/4
i2 = -1

I was thinking a Supermesh would provide the third equation I need but all I see from that is:

i1*2 + i2*3 = 0 but from the PSpice analysis I know this isn't going to lead to a solution.

Thanks

2007-09-21 09:49:34 · 2 answers · asked by John 1 in Engineering

2007-09-21 09:47:44 · 14 answers · asked by Anonymous in Geography

i know light can't, but does that mean sound can't either? plz explain

2007-09-21 09:47:38 · 16 answers · asked by rc1015 2 in Astronomy & Space

2007-09-21 09:46:53 · 4 answers · asked by katie75 1 in Other - Science