Science & Mathematics - 18 November 2006

how would a knowledge of chemistry have helped to save the Roman Empire and the hat makes of the nineteenth century.

how does an ion exchange resin soften water.

2006-11-18 10:43:38 · 6 answers · asked by Anonymous in Chemistry

In electric motors and speakers and other devices using an electomagnet or solenoid, what is it that switches the polarity of the magnet?

2006-11-18 10:42:00 · 5 answers · asked by Anonymous in Engineering

2006-11-18 10:41:54 · 5 answers · asked by Cister 7 in Physics

Imagine that you are titrating 30.00 mL of 0.100 M KOH with 0.100 M HBr (HBr is in the buret). Calculate the pH of the solution after 30.00 mL of acid is added to the base.

Not sure how to do this problem, my standard method is definately not working since you can't take log(0). Any ideas on what I can do?

2006-11-18 10:41:24 · 3 answers · asked by jnieves01 1 in Chemistry

What is the relationship between color and energy?

2006-11-18 10:29:44 · 4 answers · asked by Anonymous in Chemistry

and if 6 quarts dont then how many do?

2006-11-18 10:27:35 · 14 answers · asked by sassy / sweet 1 in Mathematics

2006-11-18 10:25:53 · 1 answers · asked by john m 1 in Astronomy & Space

2006-11-18 10:24:14 · 10 answers · asked by Anonymous in Biology

2006-11-18 10:24:06 · 9 answers · asked by Vijay 1 in Chemistry

Hi. Found this interesting object at 43 deg 06 min 46.7 sec North, 71 deg 11 min 20.3 sec. Not clear enough to make out, but why is it in a crater in New Hampshire

2006-11-18 10:22:24 · 4 answers · asked by Cirric 7 in Earth Sciences & Geology

2006-11-18 10:20:40 · 2 answers · asked by ashleyg 1 in Astronomy & Space

2006-11-18 10:20:13 · 16 answers · asked by sinajina 1 in Mathematics

I'm trying to produce an equation that will provide the results, below. The first column is "x". The second column, "y", is the result I'm looking to produce with the equation.

So, for example, when x = 23, the equation should produce an answer of 92. When x = 12, the equation should produce a result of 840. When x = 4, the equation should produce 1080... and so on. Here is the full list of values:

01104
11104
21100
31092
41080
51064
61044
71020
8992
9960
10924
11884
12840
13792
14740
15684
16624
17560
18492
19420
20344
21264
22180
2392
240

..can anyone help me with this one?

Thanks a whole whole whole bunch!

Jamie

2006-11-18 10:19:51 · 4 answers · asked by samea76 2 in Mathematics

2006-11-18 10:19:44 · 4 answers · asked by Pramod 3 in Engineering

I've been reading about cord blood banking/uses & embryonic stem cells. What I don't understand is if the use of cord blood is limited? One report I read hinted that cord blood is useful only for immune disorders & some types of cancers. Any enlightenment would be appreciated.

2006-11-18 10:17:05 · 1 answers · asked by medicbev 2 in Other - Science

Compute the acceleration of a block sliding down a 30 degree incline, the coefficient of sliding friction being 0.20

...Thanks

2006-11-18 10:15:31 · 3 answers · asked by knicksfan000 1 in Physics

2006-11-18 10:13:41 · 15 answers · asked by Ricardo N 1 in Mathematics

Please tell me a chemical reaction of ester (apart from hydrolysis) that can distinguish ester from alcohol and carboxylic acid. Thanks!

2006-11-18 10:13:41 · 2 answers · asked by Anonymous in Chemistry

2006-11-18 10:12:20 · 3 answers · asked by john m 1 in Astronomy & Space

2006-11-18 10:10:55 · 4 answers · asked by M T 1 in Astronomy & Space

I have a Biology exam on monday! I dont know how to memorize the whole lifecycle, how do I know what is important?
Chytridiomycota
Zygomycota
Basidiomycota
and
Ascomycota.
How do I pick the important parts? There is so much information in one lifecycle I cant get myself to know all of it...HELP!
THANK YOU!

2006-11-18 10:10:53 · 0 answers · asked by Anonymous in Botany

I am expected to buy a graphical calculator for my AS/A2 maths and further maths but I do not know which one to choose. The modules I will be taking are; C1, C2, C3, C4, FP1, FP2, M1, M2, M3, M4, D1 and D2. Any suggestions?

2006-11-18 10:07:59 · 4 answers · asked by Leo 1 in Mathematics

2006-11-18 10:07:13 · 4 answers · asked by Anonymous in Chemistry

I have never seem to be able to swallow a pill? I don't know why? I always have to open then and let whatever is in the pill or crush them into a cup of water. Do you know why I can't swallow a pill?

2006-11-18 10:02:20 · 14 answers · asked by kimberly1953@sbcglobal.net 1 in Medicine

2006-11-18 10:00:14 · 6 answers · asked by john m 1 in Astronomy & Space

i just want to know when the peak is for the leonids tonight saturday november 18

2006-11-18 09:58:31 · 3 answers · asked by The Eternal Warrior? 4 in Astronomy & Space

Scientific calculators include the TI-34, the Casio fx-280 or fx-250, and the Sharp 506 VB or 520 VB.
Before doing the following example, find the button on your scientific calculator that is labeled ab/c

2006-11-18 09:52:33 · 4 answers · asked by single2mingle22000 2 in Other - Science

could you tell me how to drow it?

2006-11-18 09:51:38 · 2 answers · asked by Anonymous in Chemistry

2006-11-18 09:51:20 · 10 answers · asked by john m 1 in Astronomy & Space

how do you solve a problem like this

2006-11-18 09:51:08 · 4 answers · asked by jk 1 in Physics