Science & Mathematics - 21 December 2006

what is coals elemenal composition

2006-12-21 04:51:45 · 4 answers · asked by crackg 1 in Chemistry

Would an equal number of sodium chloride, NaCl, or calcium chloride, CaCl2, do a better job of keeping streets from freezing? Explain at a molecular level. Why do most highway departments use both chemicals?

2006-12-21 04:50:13 · 4 answers · asked by luc_allmon 2 in Chemistry

2006-12-21 04:47:31 · 9 answers · asked by nomar2007 1 in Zoology

The Alkalinity or acid of a substance ie. Soil is measured in pH.
Neutral is a pH of 7. Beneath that figure the substance is acid and above 7 it is alkaline

2006-12-21 04:45:33 · 4 answers · asked by Ronald N 1 in Chemistry

how to do this problem on Microsoft excel?

if $300000 mortgage
interest rate 6%/a compouded monthly
what is the payment in 25 years? in 15 years?
---
im not so good with money...first off...what is mortgage?

2006-12-21 04:44:55 · 2 answers · asked by no name 1 in Mathematics

i have an LED and I cut off the light from it. I have copper wire and i sanded it on each end of the wires. Then, i connected the copper wire to the LED wires and i wrapped it around in aluminum foil to keep the wires in place. Then, at the ends of the copper wire, i connected them and no heat is being given off. Does that mean that there is no electricity being flowed through the LED to the copper wires? Please Help me i am desperate.

The Best Answer will surely receive 10 points

2006-12-21 04:44:19 · 2 answers · asked by Igobeg O 3 in Engineering

2006-12-21 04:39:50 · 12 answers · asked by Anonymous in Biology

why do we cry when we're upset?
what's the point of crying?
is there an evolutinary advantage to crying?

this is for a biology report type thing, help me out.
and i want real answers with facts, not dumb guesses that have no sources.

2006-12-21 04:39:48 · 19 answers · asked by Anonymous in Biology

2006-12-21 04:38:06 · 9 answers · asked by Jim G 5 in Zoology

I was wondering if anyone could help me out with this question, I really don't get what I'm supposed to do.

x varies directly as the square of s and inversely as t. How does x change when s is doubled? When both s and tare doubled?

2006-12-21 04:37:42 · 1 answers · asked by S.H.I.E.L.D. 1 in Mathematics

what is the elemental composition of coal(what elements make up a specific fuel)?

2006-12-21 04:35:29 · 6 answers · asked by crackg 1 in Chemistry

I just want a answer

2006-12-21 04:33:05 · 2 answers · asked by Anonymous in Botany

2006-12-21 04:32:57 · 12 answers · asked by vibrance0404 3 in Geography

Examples:
Kazakhstan, Iran, Turkmenistan,
Uzbekistan and Afghanistan.

2006-12-21 04:27:24 · 5 answers · asked by bobaloo02 3 in Geography

2006-12-21 04:24:49 · 14 answers · asked by Anonymous in Mathematics

2006-12-21 04:24:13 · 9 answers · asked by Anonymous in Biology

Okay, please correct me if I am an idiot, but as of now, 0*0=0. Think about 0*0...it's saying that you have NO zeros...if you have no zeros, how do you end up having 0? If you have no nothing, you have something...but it could end up being any possible number EXCEPT 0, putting it at undefined pretty much.

Also...2*3=6, 6/3=2. 0*0=0, 0/0=undefined.

I believe that with the 0 equations, they should both be equal, but they aren't because 0*0=0 =/.

Please enlighten me :). Thanks.

2006-12-21 04:23:51 · 14 answers · asked by emerson m 1 in Mathematics

2006-12-21 04:22:13 · 8 answers · asked by Balaboo 5 in Astronomy & Space

supposing that the earth had a more circular orbit.
what would be the difference between having venus collide with the earth's ocean, versus colliding with land.
best and worst-case scenarios, please.

2006-12-21 04:20:13 · 14 answers · asked by Dayne's gal 2 in Astronomy & Space

2006-12-21 04:15:37 · 47 answers · asked by JOHN Y 2 in Mathematics

I WANT SNOW, but is it ever gonna come?

2006-12-21 04:14:22 · 3 answers · asked by Bar19one 3 in Weather

2006-12-21 04:13:38 · 18 answers · asked by Liza S 1 in Weather

2006-12-21 04:13:26 · 10 answers · asked by shane r 1 in Mathematics

Suppose that within a population of zebras, 111 out of 403 exhibit a recessive hoof trait. In the next generation, 192 out of 598 zebras exhibited the same trait. Show the steps involved in determining whether evolution has occurred

2006-12-21 04:11:58 · 18 answers · asked by hey!!!! 1 in Biology

various measurements are recorded at different times. bottom temperatures are recorded and a mean temperature of 30.4°C is obtained for the temperatures recorded on 61 different days. σ = 1.7°C, test the claim that the mean population temperature is greater than 30.0°C. Use a 5% level of significance.

i cant find the level of significance chart in my book. i have t and z. am i missing something to find the p-value and test statistic. null and alternate hypothesis.

2006-12-21 04:11:34 · 3 answers · asked by pluca 2 in Mathematics

2006-12-21 04:11:15 · 2 answers · asked by bh 2 in Engineering

Suppose that within a population of frogs, 120 of a total of 480 exhibit an eye colour which is controlled by a recessive allele. In the next generation, 182 out of 506 frogs exhibited the same trait. Show the steps involved in determining whether evolution has occurred.

2006-12-21 04:11:04 · 3 answers · asked by hey!!!! 1 in Biology

2006-12-21 04:09:11 · 8 answers · asked by lizbulgarelli 2 in Zoology

A. f (x) = x + 3
B. f (x) = 5x + 3
C. f (x) = 3x + 5
D. f (x) = 3

2006-12-21 04:08:59 · 7 answers · asked by rmfurther3000 1 in Mathematics

air or wind.
THank you, ☼ sol -Liz ☼

2006-12-21 04:07:10 · 8 answers · asked by lizbulgarelli 2 in Astronomy & Space