Science & Mathematics - 13 September 2007

what does triethylamine look like after reacting with HCL, it IS soluble, and it does dissolve

2007-09-13 08:09:41 · 1 answers · asked by Anonymous in Chemistry

Need help with maths question. points for grabs !!!!
Solve:
7/x + 2 + 1/x-1 = 4

Show that 25 - (x-8)^2 / 4 = (2 + x) (8-x) / 4

2007-09-13 08:09:17 · 2 answers · asked by Anonymous in Mathematics

2007-09-13 08:09:13 · 15 answers · asked by 9babbitfoot9 1 in Mathematics

70 ones=______hundreds
60 tens=______ ones
600 hundreds=________thousands
Find the Value:
765,802___________ (the eight is underlined)
9,806 _____________(the nine is underlined.

Her homework came with no instuctions at all. I have definatly been out of school to long.

2007-09-13 08:05:51 · 9 answers · asked by Cardinal Fan 1 in Mathematics

2007-09-13 08:05:16 · 3 answers · asked by tamdayash 1 in Mathematics

4x^2 + y^2 + 16x + 6y - 3 = 0

2007-09-13 08:03:27 · 4 answers · asked by Anonymous in Mathematics

what does the structure of triethylamine look like when reacting with ether. it is soluble.

because the N in the triethylamine does NOT have a hydrogen attached to it, it just has 2 electrons, i dont understand how it reacts with ether? will it take a hydrogen molecule from one of the carbons in the ether?

PLEASE HELP

2007-09-13 08:01:50 · 1 answers · asked by Anonymous in Chemistry

2007-09-13 07:55:30 · 7 answers · asked by Gil 1 in Mathematics

2007-09-13 07:55:15 · 4 answers · asked by ajmide2002 1 in Engineering

Thanks

2007-09-13 07:53:40 · 2 answers · asked by Mark 1 in Chemistry

What year was the earth made/ when did it become a planet? I need to know for a report on the earth LOL

2007-09-13 07:47:44 · 14 answers · asked by J 0 E 1 in Astronomy & Space

Problem #1:
Aluminum oxide is formed from the reaction of metallic aluminum with oxygen gas. How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide?
Hint: This is a simple ratio problem. Just use the molar ratio from the balanced equation. This was covered in 5.09. Mass is not involved.

Problem #2:
Determine the number of grams of NH3 produced by the reaction of 3.5g of hydrogen gas with sufficient nitrogen gas. (Check for diatomic elements). Use the flowchart below for help.

Given quantity in grams--> change to moles----> multiply by ratio from balanced equation -----> convert wanted quantity from moles to grams.

2007-09-13 07:46:05 · 2 answers · asked by Anonymous in Chemistry

I need examples of pH, Biochemsitry, and Equilibrium in terms of chemistry

Thanks

2007-09-13 07:40:39 · 1 answers · asked by shawn s 2 in Chemistry

benzoic acid, easy to look up what it looks like.
my question is... when benzoic acid reacts with naoh, it reacts with the oh, the oh takes the H from the oh thats attached to benzoic acid. NOW the NEW o that has 1 bond and 6 electrons around it, is attached to a carbon that is FULL, does it create a double bond and over fill the carbon, or does the molecule stay with a negative charge, i dont understand the rules for when a carbon can have an over full shell.
PLEASE HELPPPP

2007-09-13 07:40:09 · 2 answers · asked by Anonymous in Chemistry

I'm fed up with creationists saying mutations are always deleterious. Surely there must be at least on recorded example of a benign mutation (in the lab or something).

2007-09-13 07:38:24 · 12 answers · asked by Anonymous in Biology

2007-09-13 07:37:17 · 13 answers · asked by red babii gurl roar 1 in Mathematics

2007-09-13 07:36:58 · 5 answers · asked by maxfashun911 1 in Chemistry

2007-09-13 07:30:28 · 6 answers · asked by Anonymous in Mathematics

125k^3+27=

Factor this as far as possible
Answer = (15k+13)(25k^2-15k+9)

Please post step by step, I need help.

2007-09-13 07:29:18 · 1 answers · asked by Parth G 1 in Mathematics

I was told it was tylonol, because I was really sick and running a fever, and I had to go in for a drug test today. I had been drinking and peeing a lot, will that help me any?

2007-09-13 07:25:43 · 4 answers · asked by Anonymous in Medicine

the fiber in our diet is really__________.
where is glycogen stored in animals?
the sugar and phosphate group of nucleic acid make up the ______ of the molecule.

2007-09-13 07:25:01 · 2 answers · asked by Anonymous in Chemistry

if you could go back in time and go forward into the future, where would you go and what would you do?

2007-09-13 07:24:49 · 10 answers · asked by Anonymous in Physics

2007-09-13 07:24:25 · 12 answers · asked by tamdayash 1 in Mathematics

1) 101.69 * 23.847

Also, how do I know what to put my answers in scientific notation? Let's just say that I get an answer that is something like 22.66 and the answer was supposed to have 4 significant figures. Do I need to put the answer in scientific notation or no?

Thanks for your help!

2007-09-13 07:21:07 · 2 answers · asked by sillyboys_trucksare4girls 2 in Chemistry

Lets take a natural magnet.
Certainly we can produce some movement wth it. If we manage the magnetic fields, we can eventually make some use of it. In other words, we will be using the magnet as a source of energy. Like a long life battery.
A small magnet will not have much force, but regarding its life time, the energy released in a long term can be pretty good.
Is there any mechanical device using this force?
How long the magnetic field will be good enough before needing replacement?
Is there any way improove the strength (like taking out that energy faster)
Sorry if this sounds like a stupid question for the experts, but magnets are something that seems to me like totally different from traditional sources.

2007-09-13 07:20:00 · 7 answers · asked by Don't worry... be happy 3 in Physics

2007-09-13 07:17:25 · 3 answers · asked by Anonymous in Physics

-3(x - 2 ) = 5 (2x +1 )

How do you do this?

2007-09-13 07:13:51 · 11 answers · asked by Jessie 1 in Mathematics

2007-09-13 07:13:22 · 2 answers · asked by ? 1 in Engineering

Someone drawn a circle on a piece of paper, marked its dimater AB, and took away the compass.

http://i4.tinypic.com/53jpr1l.gif

2007-09-13 07:09:06 · 4 answers · asked by Alexander 6 in Mathematics

If you want to test the solubility of NaCl in ethenol, which is less polar then water, what type of results would you expect?

2007-09-13 07:04:47 · 1 answers · asked by Craig x 1 in Chemistry