Science & Mathematics - 26 September 2007

2007-09-26 05:38:24 · 8 answers · asked by DD 1 in Astronomy & Space

"2-Hydroxypropanoic acid was dissolved in D2O and an n.m.r spectrum of the solution was taken. Predict, with reasons, the splitting patterns observed in this spectrum"

Any ideas welcome.

2007-09-26 05:36:47 · 5 answers · asked by C4 Snake 3 in Chemistry

2007-09-26 05:36:28 · 10 answers · asked by Anonymous in Mathematics

HELP :)

2007-09-26 05:36:20 · 5 answers · asked by olka28 1 in Engineering

2007-09-26 05:34:34 · 5 answers · asked by Ansar A 1 in Astronomy & Space

Can any one recomend a basic microbiology book.
Im doing a pharmacy BTECH and need some help.

2007-09-26 05:34:28 · 2 answers · asked by mybetterday 2 in Biology

2007-09-26 05:28:08 · 2 answers · asked by ringo starr 1 in Engineering

personally i think all telescopes are bunch of toys taking fake pictures. there are only 5000 stars in universe and they're fixed to solid firmament as mentioned in Genesis.

solar system is a lie and earth is flat immobile circle.

please take bible literally or you are a fool. scientists should grow up too.

http://www.theflatearthsociety.org/...

2007-09-26 05:25:09 · 42 answers · asked by Anonymous in Astronomy & Space

The voltage output of an AC source is given by the expression:-
deltaV=(200V)Sin wt. Find the r.m.s. current in the circuit when the source is connected to a 100ohm resistor.

2007-09-26 05:24:33 · 3 answers · asked by Anonymous in Physics

The gravitation of Indian Ocean floor is greater than any other oceans in world due to a large concentration of seamounts and mountains chains which causes the ocean surface to cave in, at the lowest point it can be and up to 300 feet "below sea level" in the area of 1,000 miles in diameter. True or False?

2007-09-26 05:23:44 · 3 answers · asked by <OiO> 4 in Earth Sciences & Geology

found small brown vial labeled opo caymorium (not sure of spelling on last word). What is it and what is it used for?

2007-09-26 05:17:51 · 1 answers · asked by kk 1 in Chemistry

I heard people died due to cloud burst.

2007-09-26 05:14:55 · 15 answers · asked by SREE 1 in Weather

A soccer ball of diameter 31cm rolls without slipping st a linear speed of 2.3m/s. Through how many revolutions has the soccer ball turned as it moves a linear distance of 15m?

2007-09-26 05:12:48 · 2 answers · asked by Anonymous in Physics

2007-09-26 05:11:58 · 9 answers · asked by LuvPnk 1 in Astronomy & Space

Does anyone have info on droughts out there? Were do they happen alot? -girl in 6th grade

2007-09-26 05:11:41 · 4 answers · asked by Anonymous in Weather

what is it expanding into?

2007-09-26 05:10:00 · 16 answers · asked by YAMI 3 in Astronomy & Space

2007-09-26 05:09:13 · 1 answers · asked by lana l 1 in Chemistry

when two resistors r1 and r2 are connected in parallel, the net resistance satisfies the equation: 1/r=1/r1+1/r^2

2007-09-26 05:04:50 · 4 answers · asked by tankwillmsg 1 in Mathematics

Suppose a Chinook salmon needs to jump a waterfall that is 1.50 m high. If the fish starts from a distance 1.20 m from the base of the ledge over which the waterfall flows, find the x- and y-components of the initial velocity the salmon would need to just reach the ledge at the top of its trajectory.
v0x = ________m/s
v0y = ________m/s

Can the fish make this jump? (Assume that a Chinook salmon can jump out of the water with a speed of 6.26 m/s.)
yes or no?

2007-09-26 05:02:27 · 1 answers · asked by wmartine 1 in Physics

A rocket is launched at an angle of 58.0° above the horizontal with an initial speed of 97 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 28.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile.
(a) Find the maximum altitude reached by the rocket.
m
(b) Find its total time of flight.
s
(c) Find its horizontal range.
m

2007-09-26 04:59:54 · 2 answers · asked by wmartine 1 in Physics

1Calculate the number of moles in 58.2 g of Se. SIG. FIG.

2Calculate the number of moles in 1.43x1022 NO2 molecules. SIG. FIG.

3Calculate the mass (in g) of 6.16 moles of H2O. SIG. FIG.

4Calculate the number of moles in 86.2 g SO3. SIG. FIG.

5Calculate the number of oxygen atoms in 20.6 g SO3. SIG. FIG.

I normally wouldn’t ask someone to do hw for me but right now I have no other choice since I need the time to study math If you help me fine ill give you five stars.

2007-09-26 04:58:57 · 2 answers · asked by Anonymous in Chemistry

Write the compound formulas for each of the following pairs and the name of the compound formed when the elements or radicals combine.

a) Mg^+2 + OH^-1

b) K^+1 + PO_4^-3

c) Cu^+2 + S^-2

d) N^+5 + O^-2

2007-09-26 04:58:05 · 1 answers · asked by lana l 1 in Chemistry

can that electricity be stored & used for domestic and industrial purposes???

it's for the science project fair to be held in city..........

i need help.....................please be serious..................

2007-09-26 04:55:05 · 10 answers · asked by smarty 1 in Physics

4469.6 g of 10% H2SO4 mixed with 1047 g of 45% KOH and 70 L of water (total volume is ~75L), should give a pH of around 2.....however in real life I get a pH of around 1.5-1.6....what is going on here?

Additional Details

1 second ago
4469.6 grams of 10% H2SO4 mixed with 1047 grams of 45% KOH and 70 L of water (so total volume is ~75L), calculated should give a pH of around 2.....however in real life I get a pH of around 1.5-1.6....what is going on here????
>>>>>>>>>>>>>>>>>>>>>>
The calculations are:

4469.6 grams of 10% H2SO4 = 446.95 g/98g per mole = 4.561 moles of H2SO4, 2 protons per mole = 9.122 moles of H+

1047 grams of 45% KOH = 471.15g/56 g per mole = 8.41 moles of OH-



9.122 – 8.41 = 0.712 moles of protons present

à Final volume of solution is around 75L

0.712/75 = 0.00949 moles of H+ present (per litre)

pH = -log[H+]

pH = 2.02



sure a small difference would occur between theory and the real world, but please, this is a pH calcuation

2007-09-26 04:54:45 · 4 answers · asked by Anonymous in Chemistry

please help :( x

2007-09-26 04:54:29 · 4 answers · asked by Anonymous in Physics

How many different constitutional isomers are there with the formula: C4H8ClF.

I do not understand how to figure this out. Please help!

2007-09-26 04:52:19 · 3 answers · asked by polly 1 in Chemistry

In my recent travels, I was going through Texas, when I noticed a group of armadillos crossing the road and I was struck by their magnificent beauty. After that, I started collecting photos and memorabillio about these vastly underated animals. Where can I get more information and photos about them??

2007-09-26 04:51:50 · 5 answers · asked by MLA 6 in Zoology

formula of the hydrate is CaSO4 2H2O Calcium sulfate

2007-09-26 04:51:28 · 1 answers · asked by forlaniz3 2 in Chemistry

M NaOH? Show your work and mind significant figures?

2007-09-26 04:49:04 · 2 answers · asked by forlaniz3 2 in Chemistry

2007-09-26 04:44:38 · 2 answers · asked by lana l 1 in Chemistry