Science & Mathematics - 28 October 2007

I read all the characteristics of different maple trees, but none fit what ours looks like. The tree has dark maroon (redish purple) leaves all summer, and then in fall the leaves turned a regular green color. Now that it is late fall, some of the leaves are a little yellow, then they turn brown before falling.

2007-10-28 10:48:17 · 6 answers · asked by The Grand Inquisitor 4 in Botany

im doing a paper chromatography high school science fair project extracting pigments from green leaf plants.. i have lettuce, spinach, and kale.. what are some other green leaf plants i can use?

2007-10-28 10:47:09 · 1 answers · asked by ineedanswerspleasee 2 in Botany

I found the derivative to be 2e^(2x) - e^(-x), but I can't figure out how to solve for x.

2007-10-28 10:47:04 · 3 answers · asked by Anonymous in Mathematics

why are there fewer electrons closer to the nucleus and more electrons farther away from the nuecleus?

2007-10-28 10:46:43 · 9 answers · asked by orangethursday20 1 in Chemistry

2007-10-28 10:46:38 · 1 answers · asked by Lynn T 1 in Geography

2007-10-28 10:45:11 · 11 answers · asked by G 5 in Geography

Right here: http://answers.yahoo.com/question/index?qid=20071028142836AAXwOF5&r=w#TIZXJGPqIlOC7.hDyi3Z
This is in the religion section, I know, but a lot of science questions are improperly posted there. It would be nice if he could get some scientific answers.

2007-10-28 10:40:01 · 2 answers · asked by JavaGirl ~AM~ 4 in Physics

2007-10-28 10:38:18 · 2 answers · asked by Anonymous in Mathematics

2007-10-28 10:37:36 · 2 answers · asked by ori_culumn 1 in Chemistry

a. accessory enzyme
b. allosteric group
c. coenzyme
d. functional group
e. enzyme activator

Thank you for the answers.

2007-10-28 10:32:47 · 5 answers · asked by . 6 in Biology

What Volume of 0.750 M Na3PO4 is required to precipitate all the lead(II) ions from 130.0 mL of 0.250 M Pb(NO3)2?

2007-10-28 10:31:10 · 1 answers · asked by Anonymous in Chemistry

I do physics for my A levels and i would like to know about any fun type of engineering. help please??

2007-10-28 10:30:44 · 7 answers · asked by Anonymous in Physics

2007-10-28 10:29:15 · 3 answers · asked by richiel101 2 in Earth Sciences & Geology

All of the isotopes of radon have half-lives shorter than four days, yet radon is still found in nature. Explain why all the radon has not yet already decayed.

2007-10-28 10:28:23 · 2 answers · asked by Anonymous in Earth Sciences & Geology

I dont fully understand the taylor approx from calc 3c...could you help me out with this problem...y'=t/y y(0)=1 at y(.5) and y(1) when h=.1

thanks work will help a lot...any little bit cause i have more problems involving this

2007-10-28 10:26:13 · 2 answers · asked by dimachevelle 2 in Mathematics

Sparingly soluble bases and salts, such as Fe(OH)2, and FeCO3 are more soluble in acidic than in neutral solutions. why?

can someone please help me answer this question?
thank you

2007-10-28 10:24:31 · 1 answers · asked by xyz 1 in Chemistry

The RDA is 300 mcg but I've seen biotin supplements of doses higher than 5000 mcg..apparently from what ive heard there is no such thing as "biotin toxicity" as the excess is just metabolised and flushed out in urine..this seems like a waste to me..why take 5000 mcg when your body can only use 300 mcg? or am I getting this wrong..can the human body use up to 5000 mcg (5.0 mg!) of biotin daily?

2007-10-28 10:23:22 · 5 answers · asked by Anonymous in Medicine

2007-10-28 10:23:17 · 34 answers · asked by Janelle J 2 in Other - Alternative

it's for a science project.

2007-10-28 10:22:27 · 1 answers · asked by queen_bernie 2 in Chemistry

The decomposition of ammonium carbamate to ammonia and CO2 at 40 degrees Celsius is written as
NH4CO2NH2 (s) <----> 2NH3 (g) + CO2 (g)

If the partial pressure of NH3 at equilibrium is 0.252atm , what is the equilibrium partial pressure of CO2 ?

2007-10-28 10:21:57 · 2 answers · asked by HHH 1 in Engineering

Chapter 5 is kicking my butt. I have a few questions that I just can't seem to figure out, can you please help. Thanks.

A compound of gallium with chlorine has a melting point of 77 C and a boiling point of 201 C. Is the compound ionic or covalent? What is a likely formula?

Assume that you were given samples of two white, crystalline compounds, one of them ionic and one covalent. Describe how you might tell which is which.

Is the planar triangular molecule boron (BCI3) polar? Explain.

Which of the following contains a coordinate covalent bond?
(a) H20 (b) HOClO (c) H30+

Molecular geometry (linear, planar triangular, bent w/one lone pair), tetrahedral, pyramidal, bent (w/2 lone pairs) for the following: CHCl3, H2S, O3, CS2, HNO2.

Thanks for any help you can provide.

2007-10-28 10:21:44 · 2 answers · asked by Anonymous in Chemistry

In general, when will a sparingly soluble salt precipitate from solution?

can someone please help me answer this question?
thank you

2007-10-28 10:21:37 · 1 answers · asked by xyz 1 in Chemistry

^topic^
how do you know

2007-10-28 10:20:30 · 2 answers · asked by Anonymous in Biology

I was running short of characters so apologies for the poorly phrased question. Basically, if I strung a steel cable from the moon to the Earth, such that the end of the cable nearest the Earth was 2 feet above ground and I then attached a basket or some similar device to that end of the cable and climbed in the basket, would the Earth rotate around me such that, in 12 hours, I would be halfway around the Earth?

2007-10-28 10:16:16 · 2 answers · asked by ateagan87 1 in Astronomy & Space

I have this paper that asks me the family number of an element and the family name. How do I find out the family name?

2007-10-28 10:15:07 · 2 answers · asked by Coco M 1 in Chemistry

2007-10-28 10:13:45 · 2 answers · asked by chaseslaws12 2 in Chemistry

I am guessing potatoes, because we did a lab with hydrogen peroxide, apples, potatoes, and liver, and the reaction was fastest with liver, then potatoes, then apples.

Does anyone know for sure?

2007-10-28 10:13:32 · 2 answers · asked by Anonymous in Biology

I would appreciate it if someone could answer it.

Again the question is:
Is there a consistent relationship between component masses and the formula of a compound? What is it?

2007-10-28 10:12:35 · 2 answers · asked by Anonymous in Chemistry

2007-10-28 10:11:13 · 5 answers · asked by Noman H 1 in Medicine

2007-10-28 10:10:29 · 2 answers · asked by asteriskflame2 2 in Biology