Science & Mathematics - 28 July 2007

2007-07-28 21:09:19 · 2 answers · asked by david m 2 in Chemistry

2007-07-28 21:07:59 · 2 answers · asked by david m 2 in Chemistry

2007-07-28 21:06:57 · 10 answers · asked by iSmile 2 in Mathematics

i know that hexane is non-polar however i am having trouble finding information on its uses as a solvent. I am also wondering how reliable the old adage "like dissolves like" is in relation to polar and non-polar substances and if there is a better adage?

2007-07-28 21:05:12 · 2 answers · asked by Jess 1 in Chemistry

2007-07-28 20:57:20 · 3 answers · asked by nix** 1 in Mathematics

It is said that if you soak grubby socks or coffee stained fabric in hot salty water for a few hours it will remove the stain. this is said to be a natural alternative to bleaches etc. so what is the chemistry behind this?

2007-07-28 20:55:21 · 1 answers · asked by Jess 1 in Chemistry

In physics one often models a system using linear equations...not because the system IS linear, but because these equations can be solved!
Isn't this a fatal flaw?...wouldn't physicists be better off doing Economics? At least everyone knows that it is a deceit

2007-07-28 20:49:21 · 13 answers · asked by Anonymous in Physics

i have to answer a chemistry question on how soda water followed by a towel press will clean coffee out of carpet. i was hoping to find out the relative equations and principles behind the cleaning capabilities of soda water and whether it is the bubbles or the carbonic acid which does the cleaning.

2007-07-28 20:37:20 · 2 answers · asked by Anonymous in Chemistry

you have to prove it it is maths trignomatory question 2(Square)

2007-07-28 20:24:50 · 3 answers · asked by aryabhatt 1 in Mathematics

i don't know how to answer this, some one please help thanx very much

2007-07-28 20:19:23 · 3 answers · asked by Pat U 1 in Chemistry

this is an experiment on heating the nitartes and carbonates of the s-block element.
a)lithium nitrates and lithium carbonate
b)potassium nitrates and potassium carbonate
c)magnesium nitrates and magnesium carbonate

2007-07-28 20:16:19 · 3 answers · asked by ystan n 1 in Chemistry

this is an experiment on heating the nitartes and carbonates of the s-block element.
Li2CO3, MgCO3, CaCO3, SrCO3, BaCO3, LiNO3, NaNO3, KNO3, Mg(NO3)2, Ca(NO3)2, Sr(NO3)2, Ba(NO3)2

what is the change on thermal stability when down the group?
Is increasing or decreasing down the group?

2007-07-28 20:15:48 · 2 answers · asked by ystan n 1 in Chemistry

On further heating,they become white solids again,before they decompose.

this is an experiment on heating the nitartes and carbonates of the s-block element.
Li2CO3, MgCO3, CaCO3, SrCO3, BaCO3, LiNO3, NaNO3, KNO3, Mg(NO3)2, Ca(NO3)2, Sr(NO3)2, Ba(NO3)2

2007-07-28 20:15:46 · 4 answers · asked by ystan n 1 in Chemistry

2007-07-28 20:11:57 · 2 answers · asked by m.k 2 in Botany

Interesting reading about Tesla. He created "free energy" and the government shut him down (for lack of a better term) I'd like to get your opinions on the subject.

Every so often, you hear about someone creating cold fusion in their kitchen or bath tub and as soon as you hear about it, the/that story disappears.

Your thoughts or experiences please ?

2007-07-28 20:04:09 · 5 answers · asked by Anonymous in Physics

i'm looking for who ,why, and what there is to litigate when it's all in brazilian territory?

2007-07-28 20:02:45 · 1 answers · asked by brain 1 in Geography

In the equation of velocity
v = d(x)/d(t)
what r the conditions to make velocity (v) = 0?

2007-07-28 20:02:10 · 8 answers · asked by rajesh bhowmick 2 in Physics

a) 12a^7/8 / 3a^1/4
b) (a^2/3 b^5/6)(a^1/2 b) / (ab)^1/3
c) (a^1/4 b^3)^1/2 / (a^1/3 b^1/4)^-5
d) (a^1/2 + a^1/2)(a^1/2 - a^1/2)

2007-07-28 20:01:48 · 3 answers · asked by Anonymous in Mathematics

2007-07-28 19:56:56 · 7 answers · asked by Johnson 1 in Weather

do they leave the rocket in space????

2007-07-28 19:49:54 · 7 answers · asked by magic_1224 1 in Astronomy & Space

Hey Guys,
I was given some equations to work out for homework. Most of them I have got but some of the harder ones I cannot. For each we have been told one of the products that they form. But this still doesnt help for me.

Can anyone help?

They are:

KMnO4 + FeSO4 (Have been told that it forms MnO2)

FeSO4 + NaSCN (Have been told that it changes Fe2+ to Fe3+)

CuSO4 + HCl (Have been told that it forms [CuCl4]2-)

CuSO4 + NaOH + heat (Have been told that it forms CuO)

Any help is much appreciated.
Thanks

2007-07-28 19:47:07 · 1 answers · asked by Anonymous in Chemistry

what is the importance of knowing which candles burn faster the white or colored ones tnx! :) this is for my investigatory project. please answer as soon as possible .. thank you very much

2007-07-28 19:45:03 · 5 answers · asked by kat_silver07 1 in Chemistry

http://s35.photobucket.com/albums/d160/Ruyanette/?action=view¤t=Spider.jpg

2007-07-28 19:42:53 · 4 answers · asked by Pinky 3 in Zoology

Does the Moon have affects on peoples' behavior in addition to its gravitation on the earth?

2007-07-28 19:19:14 · 12 answers · asked by Boomer 5 in Astronomy & Space

2007-07-28 19:15:52 · 23 answers · asked by suzie q 1 in Astronomy & Space

i wanna know so i can see my friends house live! plz help me!

2007-07-28 19:08:36 · 5 answers · asked by maaaar. 4 in Astronomy & Space

Every now and I have seen what some people call the shadow people. They are black, nontransparent, almost cartoon like. They are fast moving also and seem to not want to be seen, running away when looked at.
They are extremely CREEPIER than anything I have ever seen. They just look and feel evil. I say one in the back seat of a car I never drove again and sold real fast, and even saw one at Walmart once sliding along a wall.
And no they are not shadows, that I know for sure.
Disbelieving fools need not reply, go play somewhere else please!

2007-07-28 19:07:01 · 22 answers · asked by John S 5 in Paranormal Phenomena

Okay, im making a stage design model for school.
The actual stage is 12m by 18m (40 x 60 ft)
I need to make my model in porportion with the measurements...
The material i have for the base is 134cm by 83cm.
The material is easy to cut so i can cut it smaller if needed.
Can you help me with this, i hate measurement/ratios!

2007-07-28 18:58:31 · 4 answers · asked by Anonymous in Mathematics

1.) cot Θ + tan Θ = csc^2 Θ + sec^2 Θ / csc Θ sec Θ

that is: cot Θ + tan Θ = csc^2 Θ + sec^2 Θ (over) csc Θ sec Θ

2.) 1-2 cos Θ / sin Θ cos Θ = tan Θ - cot Θ

that is: 1-2 cos Θ (over) sin Θ cos Θ = tan Θ - cot Θ

2007-07-28 18:57:17 · 2 answers · asked by Hansel and G 1 in Mathematics

2007-07-28 18:55:26 · 1 answers · asked by Anonymous in Earth Sciences & Geology