Science & Mathematics - 29 December 2006

a. elements on the far left tend to form positive ions while those on the right tend to form negative ions.
b. elements on opposite ends of the periodic table have similar arrangements of electrons.
c. elements on the far left tend to form negative ions while those on the right tend to form positive ions.
d. elements on opposite ends tend to share a pair of electrons with each other.

2006-12-29 07:15:34 · 4 answers · asked by Anonymous in Chemistry

2006-12-29 07:13:24 · 5 answers · asked by Anonymous in Geography

I was at a party the other night were a guy posed this question and stated that there is no simple answer. I then asked if there actually is a difference between the two. That too, he responded stating that there is no simple answer. So first of all, is there a difference between contagious and infectious? If so, what is the difference? Thanks.

2006-12-29 07:13:20 · 2 answers · asked by danman4472 2 in Biology

would it weaken the gene pool?

2006-12-29 07:10:46 · 12 answers · asked by naughty boy 1 in Biology

2006-12-29 07:10:46 · 13 answers · asked by Tyrone 2 in Mathematics

2006-12-29 07:10:31 · 16 answers · asked by Anonymous in Geography

I just read this phrase in the Belgian magazine "Knack": "In 2006 the first observation was made of two collapsing solar systems big enough to create the black mass of which most of our universe consists."

I suspect that two stars that are trapped in each others gravity would collapse and make a black hole. But is most of the mass in our universe this 'black mass'?

I also remember reading about the volume of a black hole shrinking, even under the circle of singularity. To me, that sounds like there is no more mass left then. Or is there? Can anyone explain please? :P thx

2006-12-29 07:10:05 · 3 answers · asked by JohnyD 3 in Astronomy & Space

23 homolgous pairs =46 chromsomes. shouldn't it be 46 homologous pairs like for karyotype, which shows 2 pairs of 23 homologous chromosomes, one pair(23) from father and one pair(23) from mother.

2006-12-29 07:09:08 · 2 answers · asked by avalentin911 2 in Biology

An electromagnetic wave has two major components, the electrical (E) and magnetic (H) fields; are these fields able to be induced separately?

2006-12-29 07:01:21 · 3 answers · asked by carmicheal99 1 in Engineering

what is an event that happened in the Jurassic period that contributed to the Cretaceous period?
It needs to have a lot of information........

2006-12-29 07:00:34 · 5 answers · asked by luvtoshop545 2 in Zoology

a. 6%
b. 54%
c. 20%
d. 60%

2006-12-29 06:57:01 · 2 answers · asked by Anonymous in Weather

Wave propagation theory shows that positive forces are additive to negative forces effectively canceling them or reinforcing them dependant upon phase.
For example: sin(x) - sin(x) = 0 (on same domain).

The theory also shows that an electrical (E) and magnetic (H) component are present at right angles to one another when inducing current through wire (right-hand rule). Say an apparatus were designed to generate the E and H components separately then feed them to the same line 90 degrees out of phase, would this induce a tangent waveform perpendicular to the line because every 180 degrees the fields would collapse if one were to use the definition sin(x)/cos(x) = tan(x)?

Now if that premise were correct, cut the line to introduce a standing wave that would cancel the E and H fields to produce a null field. Is this an example of tan(x) - tan(x) = 0? If so, then this would produce the case of tan(pi/2) - tan(pi/2) = 0.

2006-12-29 06:55:28 · 2 answers · asked by carmicheal99 1 in Physics

function of ?

a. reproduction
b. locomotion
c. egestion
d. excretion

2006-12-29 06:52:42 · 3 answers · asked by Anonymous in Biology

2006-12-29 06:51:42 · 10 answers · asked by Anonymous in Medicine

2006-12-29 06:51:34 · 5 answers · asked by ? 4 in Physics

a: 0
b: 2
c: 4
d: 1

2006-12-29 06:48:51 · 4 answers · asked by ferrari 1 in Mathematics

Don't remember how to do this type of problem and pre-calc was so long ago for me.

2006-12-29 06:46:17 · 4 answers · asked by TM 3 in Mathematics

What would a map of the world look like if both ice caps melted?

2006-12-29 06:45:31 · 8 answers · asked by Zefram 2 in Earth Sciences & Geology

In a room there is a large circular table with chairs all around it, just enough for all of the student who need to complete homework assignments. The teacher is holding this large stack of assignments. If the student gets a worksheet, he or she must leave the room to complete it.

The first worksheet is given to the student in chair 1, the second goes to the student in chair 3, then the 5th chair and so on. When the teacher gets back to the beginning, he continues in the same pattern with the remaining students (that means he does not start over again with the first student).

Finally, there is only one student left, and that student gets an A without any homework. Where would you want to sit if there were 23 students? What about 18 students? Where would you sit if there were 41 students?

2006-12-29 06:44:40 · 13 answers · asked by balletgirl 2 in Mathematics

it's so cold there!!!

2006-12-29 06:43:37 · 24 answers · asked by ily123<3 2 in Weather

I know they're in March, June, September, and December, but when are the exact dates? 21st or 22nd for each?

2006-12-29 06:40:27 · 3 answers · asked by Anonymous in Astronomy & Space

There are many materials in the world like steel, iron, copper, etc etc. which is the most dense metal?

2006-12-29 06:38:47 · 7 answers · asked by Milton S 1 in Engineering

Given that at 10 degrees Celcius, 8.9 x10^-5 g of AgCl(s) will dissolve in 100 mL of water

2006-12-29 06:38:21 · 3 answers · asked by trakstar16 1 in Chemistry

Say it's costs about $500 would you do it? If so why? If not,why not?

2006-12-29 06:36:33 · 16 answers · asked by Dr. Christopher Carter 2 in Biology

2006-12-29 06:36:10 · 9 answers · asked by wtf? 1 in Parapsychology

WHY?

2006-12-29 06:33:50 · 7 answers · asked by rebelchikrocker 5 in Chemistry

if you have a cold you can take a hot toddy (whisky+warm water+suger mixed together in a glass) to raise your temperature and sweat the cold out of you, my question is why does a mixture of whisky, warm water and sugar raise your temperature, none of the ingredients on its own will significantly raise your temperature

2006-12-29 06:32:43 · 6 answers · asked by Anonymous in Biology

Its called emereald parcel gems. does anyone know the value of them there are about 59. carrots in them

2006-12-29 06:27:41 · 2 answers · asked by bboyballer112 2 in Earth Sciences & Geology

You have two 500 mL aqueous solutions. Solution A is a solution of silver nitrate, and solution B is a solution of Potassium Chromate. The masses of the solute in each of the solutions are the same. When the solutions are added together, a blood-red precipitate forms. After the reaction has gone to completion, you dry the solid and find that it has a mass of 331.8g.
(a) calculate the concentration of the potassium ioins in the original potassium chromate solution.
(b) calculate the concentration of the chromate ions in the final solution.

2006-12-29 06:26:49 · 2 answers · asked by kat g 2 in Chemistry

How did animals like pot-bellied pigs survive. They aren't exactly mean or predatory animals. Do they have no natural predators??

2006-12-29 06:20:18 · 6 answers · asked by Dr. Douche 3 in Zoology