Science & Mathematics - 16 October 2006

In order to stay within safety limits a manufacturer cautions that the gas in a cylinder should not exceed a pressure of 1250psi. If the gas in the cylinder exerts a pressure of 950psi at 27 degrees C, the maximum temp. the cylinder can be exposed to without exceeding the recommended pressure is _____ degrees.

The correct answer is 122 Degrees...but how the world do you get it?!

2006-10-16 12:35:25 · 2 answers · asked by Travis S 2 in Chemistry

2006-10-16 12:35:24 · 2 answers · asked by saires45 1 in Biology

A) 2HCl(aq) + BaCO3(s) ->
B) 2HI(aq) + K2SO3(s) ->
C) Pb(NO3)2(aq) + 2KCl(aq) ->
D) Ba(NO3)2(aq) + Na2(CrO4)(aq) ->
E) K2CO3(aq) + Ba(NO3)2(aq) ->
F) HCl(aq) +AgNO3(aq) ->

2006-10-16 12:34:43 · 2 answers · asked by i<3WL 2 in Chemistry

2006-10-16 12:33:04 · 4 answers · asked by darebedaremadd 1 in Astronomy & Space

do you know anygood like songs that has the sun in it except for mr.golden sun and here comes the sun?
tell me if you do
*mwah*

2006-10-16 12:22:33 · 3 answers · asked by imsoCOOL_bejealous 2 in Astronomy & Space

i know the answer is 5. i just want to know what its name is.

2006-10-16 12:21:40 · 2 answers · asked by favre_fan 2 in Mathematics

2006-10-16 12:21:20 · 5 answers · asked by nocody 1 in Earth Sciences & Geology

2006-10-16 12:19:51 · 13 answers · asked by jp 1 in Mathematics

2006-10-16 12:19:43 · 23 answers · asked by Anonymous in Biology

Hi - I think I'm integrating incorrectly. I checked my work on an integration calculator and had a completely different answer. Can you please review the following problem and help explain the calculation?

Here's what I have...

Integral: (2x^(5/4) - 7x^8 + 9e^x - 1) dx

Since this is an addition / subtraction problem, I took the integral of each part and came up with:

(2x^(9/4)/(9/4)) - (7x^9)/9 +9e^x - x + C

Am I close? Thanks!!

2006-10-16 12:15:46 · 3 answers · asked by math dodo 2 in Mathematics

I need examples of processes that require electrons please.

Thanks in adavance!

2006-10-16 12:12:35 · 2 answers · asked by Expurt Spellr 4 in Biology

2006-10-16 12:12:35 · 13 answers · asked by darebedaremadd 1 in Astronomy & Space

x=-3
x=2
y=-3

on graph paper and on a graph

2006-10-16 12:07:22 · 7 answers · asked by Anonymous in Mathematics

2006-10-16 12:07:11 · 5 answers · asked by Lleh 6 in Other - Science

(a) Water (b) Sugar (c) Oxygen (d) Chlorophyll (e) Carbon Dioxide

Please help HUGE test grade for PRE AP BIOLOGY!!!!!


***THANK U SOOOO MUCH!!!***

2006-10-16 12:04:05 · 5 answers · asked by Anonymous in Biology

check work and sig figs to see if i got them right

The pH of a 0.010M solution of a weak base is 11.20. Calculate Kb for the base.

first I take 10^-11.20 to get the [H+] = 6.3x10^-12

Since I need [OH-] not [H+] I devide 10^-14/6.3x10^-12=
.0016 = [OH-]

now that I have OH- I plug in the #'s and get

(.0016)(.0016)/(0.010-.0016) and the answer to this gives me Kb which is 3.0x10^-4

Does this look good, am I forgetting anything? thanks!

2006-10-16 12:02:26 · 1 answers · asked by Anonymous in Chemistry

on earth you weigh 105 pounds and on the sun you weigh 2800 pounds explain to me how this can be

2006-10-16 12:00:07 · 6 answers · asked by kh2anime 1 in Physics

hi

just been reading about the lunar landings , and im amazed some people think it aint so , i need to know the truth ?????????????//

2006-10-16 11:56:54 · 18 answers · asked by wainexx 2 in Astronomy & Space

I am looking for the hottest temperature that is possible to get. (besides infinity) and i mean on Earth not the sun or the center of the Earth, but on the surface of the Earth.

Thanks

2006-10-16 11:56:53 · 3 answers · asked by o7buster 3 in Other - Science

2006-10-16 11:56:20 · 10 answers · asked by Joe & Nick Lover ♥ 2 in Mathematics

Hi, will you all check my answers and significant figures, thanks

A mass of 0.256g of benzoic acid is dissolved in enough water to obtain 100.0 mL of solution. Calculate the concentration of H+ and OH- in the solution, the pH and the percent ionization of the acid.

first I got pKa from a site for benzoic acid, it is 4.20, I got the Ka by 10^-4.20=
6.3x10^-5 = Ka

now I start out by getting the moles of benzoic acid by taking .256g and deviding by 122 which gives me .00210 mol

Now that I have the moles i get the molarity by deviding the moles by liters of volume, which is .100L. So 0.00210/.100 = 0.0210M

I use the ICE method to set up my equation which is, x^2/(0.0210-x)=6.3x10^-5 I solve for x which gives me .00111M this is also the [H+] to get [OH-] I devided 10^-14 by .00111M = 9.1x10^-12 = [OH-]

Now to get pH I take the -log of [H+] so -log [.00111M] = 2.96pH

And last % ionization = .00111/.0210=.0529 x 100 = 5.29%

Are all my values correct? also sig figs

2006-10-16 11:56:06 · 2 answers · asked by Anonymous in Chemistry

2006-10-16 11:54:52 · 18 answers · asked by Lawrence L 1 in Mathematics

2006-10-16 11:54:48 · 4 answers · asked by Anonymous in Mathematics

2006-10-16 11:53:33 · 6 answers · asked by Anonymous in Mathematics

My son asked me for help with his homework and it was a quadratic equation. I looked it up in wikipedia because when I went to school they didn't teach stuff like this. It all looked like chinese to me. Could one of you math geniuses explain to me what it is all about? I feel totally stupid when trying to help him. He is taking Algebra 2 and I don't remember anything like that when I was in school.

2006-10-16 11:53:13 · 7 answers · asked by miamac49616 4 in Mathematics

(-8x^4+10x^3-4x^2+9) divided by (4x+3)
Q(x)=quotient R(x)= remainder
Where the answer is in the form of Q(x)+R(x)/4x+3

2006-10-16 11:51:48 · 4 answers · asked by SCHNITZEL 1 in Mathematics

wow, algebra can be used in real life, I figured this out once, but it didnt come out exactly but close enough so that when i figured it out i could easily find the answer, anyway here goes:
I sometimes get invoices that need to be broken down in our system, the invoice maybe for 71.50 but i need to show in our system 65.00 plus 10 percent. What is the formula to this problem to take the guess work out...thanks all
for clarification we assume that the unkown is the 65.00 and the 6.50, in other words how can we take a number like 71.50 and figure out what number plus 10 percent of that number equals 71.50

2006-10-16 11:48:07 · 9 answers · asked by Joey W 3 in Mathematics

You have \$ 40000 to invest. A Municipal Bond offers an annual interest of 4.25 per cent. The other alternative that you are considering is Treasury Note that gives an annual interest of 4 per cent, but has its interest compounded quarterly.
Value after one year of Municipal Bond \$
Value after one year of Treasury Note \$
Which of these is the better investment and by how much at the end of the first year?
Better investment (Municipal Bond or Treasury Bond)
Difference = \$
b. Put your money in the best investment and determine how much money you have after 5 years.
Value of best investment after 5 years is \$

2006-10-16 11:47:02 · 5 answers · asked by KimBo 1 in Mathematics

How much commision did Ed Jones make on $3,240 worth of merchandise at 11 3/4 commission?

2006-10-16 11:46:17 · 4 answers · asked by Caroline M 2 in Mathematics

2006-10-16 11:45:57 · 8 answers · asked by Cindy 2 in Chemistry