Science & Mathematics - 26 January 2007

2007-01-26 08:35:17 · 9 answers · asked by george l 1 in Botany

2007-01-26 08:31:58 · 1 answers · asked by profkrakatoa 2 in Chemistry

I read in Wikipedia that a couple of scientists have revived the hypothesis of Planet X and think it could be a Brown Dwarf Star that effects extra solar objects in the Oort Cloud.

2007-01-26 08:29:47 · 3 answers · asked by Anonymous in Astronomy & Space

2H2(g) + O2(g) --> 2H2O(g) ΔH = −486.6kJ

a) A phase change is involved


b) Two moles of hydrogen gas react with one mole of oxygen gas to
produce two moles of liquid water


c) Energy is absorbed by the system, the reaction species


d) If the reaction takes place at constant pressure, q = −483.6 kJ


e) ΔH for reacting four moles of hydrogen gas with two moles of
of oxygen gas is −483.6 kJ

2007-01-26 08:29:16 · 4 answers · asked by simonkf2002 1 in Chemistry

2007-01-26 08:27:27 · 9 answers · asked by Anonymous in Mathematics

when 2.84 g of MgSO4 is dissolved in the water ?
For the following reaction to occur



MgSO4 → Mg2+(aq) + SO42−(aq)



the change in enthalpy must be −91.3 kJ/mol

2007-01-26 08:26:51 · 1 answers · asked by simonkf2002 1 in Chemistry

2007-01-26 08:25:29 · 12 answers · asked by bruvvamoff 5 in Chemistry

The specific heat capacity of solid water is 2.03 J g-1 oC -1


Use a negative sign in your answer if heat is removed.

2007-01-26 08:23:57 · 1 answers · asked by simonkf2002 1 in Chemistry

2007-01-26 08:23:28 · 10 answers · asked by chris 2 in Mathematics

1. d+2/ 6 - d-4/15
A. d-6/15
B. d+6/10
C. d-6/10
D. d+6/15

2. 6x^3y - 9x^2y^2 + 3x^2y
A. 2x^2y(3x-3y+1)
B. (2x^2y - 3x)^2
C. 3x^2y(2x - 3y +1)
D. prime

3. 16a^4 - 81b^4
A.2(4a^2 + 9b^2)(2a - 3b)
B.2(4a^2 + 9b^2)(2a + 3b)
C.(4a^2 + 9b^2)(2a + 3b)(2a - 3n)
D. prime

THANKS!!

2007-01-26 08:23:18 · 8 answers · asked by Anonymous in Mathematics

calculate the molar solubility of Ag2CO3 in water. at 25C, ksp=8.1 x 10^ -12

2007-01-26 08:23:16 · 1 answers · asked by tmlfan 4 in Chemistry

2007-01-26 08:22:01 · 4 answers · asked by dooner george 3 in Weather

That it would occupy all points of space at once, is this true or just bull.?

2007-01-26 08:19:28 · 5 answers · asked by Anonymous in Astronomy & Space

state the property that illustrated in each statement. All variables represnt real number?

2007-01-26 08:16:35 · 9 answers · asked by king 1 in Mathematics

Studying plate tectonics.

2007-01-26 08:15:03 · 4 answers · asked by pressus_dalmations 1 in Earth Sciences & Geology

But if they tell you there's wet paint somewhere you have to touch it?

2007-01-26 08:13:44 · 6 answers · asked by WWF Decade Impaired Fan 2 in Other - Science

Studying Plate tectonics

2007-01-26 08:13:31 · 6 answers · asked by pressus_dalmations 1 in Earth Sciences & Geology

(-2x^2y^5)^3 (4xy)^-2
_________________
-x^2y^-2

2007-01-26 08:12:52 · 9 answers · asked by chris 2 in Mathematics

√7
____
√10 - 3

2007-01-26 08:09:59 · 7 answers · asked by chris 2 in Mathematics

Thanks for all the previous help, I need your help just one more time, and thanks to all ahead of time.
"The base of an isosceles triangle is 13 in. less than the length of the equal sides. If the perimeter is 47 in. find the length of each of the sides." This has to be in algebraic form and could you show the work please?

2007-01-26 08:09:14 · 5 answers · asked by silemuirne 2 in Mathematics

2007-01-26 08:07:12 · 7 answers · asked by chris 2 in Mathematics

We have reason to believe that my wife is part Maori, but it is important to get proof of this. I've read that DNA-based testing of the inhabitants of the Orkney Islands revealed them to be largely Norwegian by DNA; that is precisely the kind of test we think would be right. Does anyone know where to get a test like that done?

Thanks.

2007-01-26 08:04:30 · 3 answers · asked by Tahini Classic 7 in Biology

2007-01-26 08:03:47 · 25 answers · asked by Ed 2 in Medicine

This is the problem as a fraction. 19(pie)/6. First I thought that I was supposed to convert the radians to degrees but that's wrong...I'm so lost!!

2007-01-26 08:03:10 · 2 answers · asked by ndesrosiers27 1 in Mathematics

We are the reason the Dodo bird is extinct not by natural causes. So shoud we feel obligated to some way bring back the Dodo bird. And if so why should we bring back the Dodo bird.

2007-01-26 08:02:10 · 7 answers · asked by nightwheel 1 in Zoology

approximately how many atoms are in a human body?

2007-01-26 08:01:59 · 4 answers · asked by maryhbury 1 in Biology

2007-01-26 08:01:37 · 6 answers · asked by ahmedein46 1 in Engineering

what is the chemical formula
for ammonium hydrogen sulfate

I need to enter it on a answer a chemistry woksheet

2007-01-26 07:59:38 · 3 answers · asked by Alison L 1 in Chemistry

2007-01-26 07:59:13 · 2 answers · asked by jstn_alford 2 in Engineering

Why does the sun cause some to feel sleepy?

2007-01-26 07:58:57 · 5 answers · asked by thenovice 1 in Astronomy & Space