Science & Mathematics - 28 October 2007

thankkk yaa

2007-10-28 10:10:24 · 4 answers · asked by melloyellow 1 in Biology

...what will be the atomic number and mass of the resulting element? Thanks.

2007-10-28 10:09:58 · 6 answers · asked by higherlovetx 5 in Chemistry

calculate the number of moles of 5 mL of 0.004M AgNO3 and number of moles of CrO4^2- in 5mL of 0.0024M K2CrO4.

can someone please help me answer this question?
thank you

2007-10-28 10:07:47 · 7 answers · asked by abc 1 in Chemistry

2Al2O3(s) → 4Al(s) + 3O2(g).

I think ΔH° is 3340 kJ/mol for 2Al2O3(s) but..

What confuses me is that since it is on the product side, I think it would be positive. The enthalpies for Al and O2 are both zero.

So... 0 - 3340 = -3340, or it is 3340 because its on the product side?

2007-10-28 10:07:08 · 2 answers · asked by Phobia 1 in Chemistry

a piece of gold, mass 35.0 grams, absorbs 185 joules of heat energy when its temperature increases by 41 degrees C. What is the specific heat of gold?

2007-10-28 10:04:27 · 3 answers · asked by Chrishonda Alston 3 in Chemistry

Birth weights of ewes are normally distributed with a mean of 4.29 kg and a standard deviation of 0.13. What is the probability a randomly selected eye will have a weight between 4.5 and 4.8 kg?

Please help me by showing me step by step.....I don't understand it any other way.....thanks!

2007-10-28 10:03:28 · 1 answers · asked by Tiffany H 1 in Mathematics

i cant remember when daylight savings time begins this year.

2007-10-28 10:02:23 · 5 answers · asked by Soniafrompa 6 in Geography

2007-10-28 09:58:06 · 9 answers · asked by ? 6 in Geography

What would happen if the earth were tilted at 45 degrees? What would happen if the earth were not tilted at all? What would be the effect of the two scenarios on the subsolar point at the equinoxes and solstices as well as the circle of illumination.

2007-10-28 09:57:16 · 6 answers · asked by Aditya G 1 in Geography

2007-10-28 09:55:59 · 1 answers · asked by Anonymous in Botany

What was the most scaryiest, freakiest, thing thats ever happened to you? Can you give me sites of paranormal pictures?!?!?! I Like To Believe IN It, Its Fun.

2007-10-28 09:55:03 · 20 answers · asked by Anonymous in Paranormal Phenomena

what time is it currently is eastern time b/c of the time change?

2007-10-28 09:55:03 · 3 answers · asked by Anonymous in Geography

why DONT mature human blood cells have a nucleus and mitochondria?

2007-10-28 09:54:56 · 2 answers · asked by Anonymous in Biology

Please Answer

2007-10-28 09:54:52 · 2 answers · asked by landenjms 2 in Zoology

Considering which elements are being oxidized and reduced, determine how many moles of electrons are transferred between the elements being oxidized and reduced.

2007-10-28 09:53:44 · 3 answers · asked by Anonymous in Chemistry

what does hammer toe do to you?

does hammer toe stunt your overall body growth?

is shoe size/foot length a height predictor or does your feet grow according to your body?

2007-10-28 09:53:22 · 1 answers · asked by Anonymous in Medicine

2007-10-28 09:52:06 · 2 answers · asked by Anonymous in Zoology

I need to determine a, width b, vertex c, axis d, focus e, directrix f, y-intercept/ x-intercept

im posting two different king, an x= and a y= help on both would be appreciated.
1.) y= -1/3(x-2)^2 +7
2.) x= 5(y+3)^2-4

2007-10-28 09:51:13 · 1 answers · asked by Danielle M 1 in Mathematics

An athlete on a trampoline leaps straight up into the air with an initial speed of 9.0 m/.s. Find (a) the maximum height reached by the athlete relative to the trampoline (b) the speed of the athlete when she is halfway up to her maximum height.

2007-10-28 09:50:57 · 1 answers · asked by Mika 2 in Physics

so what do they do?

2007-10-28 09:50:23 · 4 answers · asked by Anonymous in Zoology

also what does the period number of a row represent?

2007-10-28 09:48:09 · 8 answers · asked by trevor_mccurdy587 2 in Chemistry

I need to prove how AB = 1
when Asin0+cos0=1 and Bsin0-cos0=1

0 being phaeta. (oO" don't know how to make it any other way.)

2007-10-28 09:46:58 · 3 answers · asked by jslouie88 1 in Mathematics

Okay, so earth rotates from west to east. what direction does the moon rotate in?

2007-10-28 09:46:36 · 4 answers · asked by Anonymous in Astronomy & Space

Can you tell how large a sample she made? How?

2007-10-28 09:46:24 · 1 answers · asked by Anonymous in Physics

i need help!! bes detalied and well-fromated answer gets 10 points!!!

2007-10-28 09:46:12 · 3 answers · asked by Anonymous in Geography

2007-10-28 09:45:56 · 6 answers · asked by Anonymous in Earth Sciences & Geology

which will let CO2 AND H2O pass through,but no substance out?

2007-10-28 09:45:26 · 4 answers · asked by Anonymous in Engineering

I have never understood why when there are so many zebras in Africa and they have never been domesticated. It seems like every other suitable animal in Africa has been domesticated so why not the zebra?

2007-10-28 09:45:07 · 2 answers · asked by cook 1 in Zoology

Body A of mass M has an original velocity of 6.2 m/s in the +x-direction toward a stationary body (body B) of the same mass. After the collision, body A has velocity components of 1.1 m/s in the +x-direction and 2.1 m/s in the +y-direction. What is the magnitude of body B's velocity after the collision?
________m/s

Please tell me HOW to do this problem, I tried and got 3 but that is not right.. please explain how to do this!

2007-10-28 09:44:35 · 1 answers · asked by ? 2 in Physics

a crate of mass 10.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100N parallel to the incline, which makes an angle of 20.0 degrees with the horizontal. The coefficient of kinetic friction is 0.400, and the crate is pulled 5.00 m. (1) How much work is done by gravity? (b) how much mechanical energy is lost due to friction? (c) what is the change in kinetic energy of the crate? (e) what is the speed of the crate after being pulled 5.00 m?

2007-10-28 09:41:07 · 2 answers · asked by Mika 2 in Physics