Science & Mathematics - 10 October 2006

2006-10-10 04:59:58 · 14 answers · asked by Pierre 1 in Mathematics

An unknown sample was known to be either cinnamic acid(m.p 133 centigrade),urea(m.p 133-135C), or malonic acid(135-136C).Given a sample of the unknown and samples of each to these three compounds,briefly indicate how you could establish the identity of the unknown through m.p determination alone.

NB: For you critics out there, I have an answer(idea). just wanted to get more views as I could be wrong. I try very hard to do my assignments without having to disturb other people. So be lenient with any negative comments or more, if you don't want to answer, pls do not criticise.

2006-10-10 04:55:20 · 6 answers · asked by obiora c 2 in Chemistry

Is this difference of two squares...no idea

In this question the there are two quanties to be added, and either quantity is completey under a square root sign so:

what is ( (sqrt of 9 plus the square root of 80 (entire quantity under the square root) plus the sqrt of 9 minus the square root of 80 (entire quantity under the square root) ) squared (in other words after those two are added the answer is squared. I know messy! help!!!

2006-10-10 04:51:13 · 6 answers · asked by Jason A 1 in Mathematics

2006-10-10 04:51:00 · 3 answers · asked by murali d 1 in Physics

Ok they put chlorine in the water to kill germs and bacteria but if they put to much there is a chance you can get cancer from it so is it worth putting chlorine in the water to kill a little bit of germs but you could get cancer from it? ok see i need a yes or a no answer and if you cant make up ur mind then put depends if you do (depends)please give me a reason why.I need this for my reseach bord (scince fair).Thank You!!!!

2006-10-10 04:50:55 · 8 answers · asked by crazyncgirl01 1 in Physics

2006-10-10 04:50:36 · 4 answers · asked by CHAZ2006 3 in Mathematics

one of the types of software tesiting. not a clear answer even in google search

2006-10-10 04:49:50 · 4 answers · asked by fault finder 1 in Other - Science

I assume it's round. If the Earth turns out to be shaped like a pear or egg or cigar like, it makes little difference to the way I live my life. Nonetheless, I have not heard a better answer of PROOF than, "Because my 3rd grade teacher told me so" or "because of pictures (presumably) taken from the moon".
Has anyone proven for themselves that the Earth is round?

"I have more proof that God exists than I have proof that the Earth is round."

2006-10-10 04:49:29 · 14 answers · asked by upf_geelong 3 in Earth Sciences & Geology

a simple c++ program-->
main()
{ static int a[]={97,98,99,100,
101,102,103,104};
int*ptr=a+1;
print(++ptr,ptr--,ptr,
ptr++,++ptr);
}
print(int *a,int *b,int *c,int *d,int *e)
{
printf("\n%d %d %d %d %d",*a,*b,*c,*d,*e);
}

help me with its o/p....i m not getting it..
its showing 100 100 100 99 99
but i thought 99 99 98 98 99

2006-10-10 04:47:08 · 2 answers · asked by Amit 3 in Other - Science

I am a first year medic and we were conducting an experiment the other day involving the movement of molecules across the cells plasma membrane. We used erythrocytes and found that for urea and glycerol, the uptake was very quick. The solution containing glucose however remained opaque. IS GLUCOSE EVEN TAKEN IN by erythrocytes?? Please quote your source. I need the answer to be reliable.

2006-10-10 04:45:25 · 7 answers · asked by Anonymous in Medicine

and a BLACK HOLE?------is the pressure the same or different.

2006-10-10 04:45:19 · 8 answers · asked by Anonymous in Astronomy & Space

2006-10-10 04:45:02 · 9 answers · asked by narayan 1 in Mathematics

i have to gather some information about CFCs and i need your help . thank you!

2006-10-10 04:42:43 · 4 answers · asked by star 1 in Chemistry

2006-10-10 04:41:19 · 20 answers · asked by hobbnobb97 1 in Physics

North Korea claims to have tested a nuclear bomb. I know that scientists will try to find out the truth of this by measuring the radioactivity in the atmosspere, but could they really see the difference between a real a-bomb and a conventional bomb with some added radiactive stuff.

2006-10-10 04:40:44 · 2 answers · asked by Anonymous in Physics

Do you believe that aliens are creating those crop circles. They seem too detailed for any mere human to create it overnight.

2006-10-10 04:37:25 · 9 answers · asked by cloud 4 in Astronomy & Space

2006-10-10 04:36:26 · 13 answers · asked by <3jimbo 1 in Earth Sciences & Geology

2. Explain how x to the power of m x to the power of n is equal to x to the power of m+n. Show how this is true using the meaning of exponents and multiplication. Use numerical examples to show it is true.

2006-10-10 04:34:46 · 8 answers · asked by thelmadc06 1 in Mathematics

Please give a full article or a web site for that..

2006-10-10 04:33:56 · 1 answers · asked by Anonymous in Physics

2006-10-10 04:32:14 · 7 answers · asked by jammy.greeny@talk21.com 1 in Astronomy & Space

just do this simple thing.
/ = fraction

a) x-3<-10
b) 4-4x>-3
c)5=3y<9y+5
d) 18-3x e) 3x-2>5x+4/-2

2006-10-10 04:30:29 · 5 answers · asked by Anonymous in Physics

2006-10-10 04:30:11 · 5 answers · asked by vicente d 1 in Earth Sciences & Geology

I'm up to 35 out of sheer boredom =/

http://video.google.com/videoplay?docid=4581508829597815922&hl=en

2006-10-10 04:26:07 · 13 answers · asked by raven7night 4 in Mathematics

2006-10-10 04:25:14 · 20 answers · asked by Anonymous in Mathematics

2006-10-10 04:23:48 · 7 answers · asked by Anonymous in Earth Sciences & Geology

I know just about every part of the country has some particualar type of weather associated with it:earthquakes in the west,scorching hot tempatures in the south,tornadoes in the middle, and freezing tempatures, evan below freezing tempatures in the north north-east.

So which area are you willing to take a chance on and brave the extreme weather?

Me, I live the south, Texas,Dallas,Texas to be exact, and in the summer tempatures can easily reach the mid 90's to 100 degree plus. personally If I could choose, I'd probably go somewhere where its cool or cold most of the time could I would do better in cold that I do heat. The heat practically melts me and I cant stand it.

So what about everybody else; what part of the country are would you take your chances on?

2006-10-10 04:23:15 · 13 answers · asked by Maurice H 6 in Weather

2006-10-10 04:22:35 · 4 answers · asked by Anonymous in Botany

Identify each of the following as examples of precision or accuracy in the measurement.

1. Time for a model race car to complete one lap. 6.12 sec; 6.01 sec; 5.96 sec
2. Blood glucose levels taken with a home monitoring device are compared to blood glucose levels measured with a laboratory test.
3. In a specific chemical reaction it is expected that 100% of the reactants will react to form product. When the mass of the product is measured it is found that there is a .12% difference in what was expected.
4. A student kept record of his distance in the standing long jump. He had distances of 5 feet 3inches; 5 feet 0 inches; 4 feet 11 inches
5. Measuring the mass of an object to the nearest milligram

2006-10-10 04:22:09 · 2 answers · asked by maconheira 4 in Other - Science

2006-10-10 04:21:10 · 2 answers · asked by jammy.greeny@talk21.com 1 in Astronomy & Space

2006-10-10 04:19:49 · 8 answers · asked by jammy.greeny@talk21.com 1 in Astronomy & Space