Science & Mathematics - 29 July 2007

chem 2 question .

we place 1.32 mol PCl5 in a 1.0 L flask and allow it to reach equillibrium ata given temp. What it the final concentration of Cl2 in the Flask.

PCl5--> PCl3+Cl2

Kc= .47

The answer is 0.59 M

but how do you get it?

2007-07-29 07:33:52 · 2 answers · asked by jo d 2 in Chemistry

2 ⤊

p - 5 from 3p - 6?

subtract

2007-07-29 07:30:15 · 5 answers · asked by LASHANDA F 1 in Mathematics

2 ⤊

Is there any medications to help recovering from damaged brain by the alcoholism?

It looks like my brain may have been damaged by alcoholism.

Is there any medication to help repairing my brain?

What are the names?

Or do you suggest any vitamins?

Thanks!

2007-07-29 07:26:47 · 4 answers · asked by davegesprek 1 in Medicine

4 ⤊

tell me some freaky paranormal things that have happened to all of you?

2007-07-29 07:22:52 · 8 answers · asked by Anonymous in Paranormal Phenomena

0 ⤊

I hate the "maquila" (assembly industry) where else can I work as a Mechanical engineer?

2007-07-29 07:20:34 · 2 answers · asked by Anonymous in Engineering

1 ⤊

How long does it take for a nerve impulse (moving 10^2 m/s) to travel the length of a human arm?

Now, I know the equation is elapsed time= distance/average speed. I measured my own arm and got 26.25 inches, converted that to meters, punched in the numbers and got 0.0067 m as the answer. However, my physics book says the answer is 10 ms.
...What am I missing?

2007-07-29 07:20:34 · 4 answers · asked by Diff 1 in Physics

24 ⤊

Is that true that we can see 2 moon in the sky in 27 of August or it is a hoax?

2007-07-29 07:18:25 · 14 answers · asked by shahab m 1 in Astronomy & Space

1 ⤊

solve -5x+1>11?

2007-07-29 07:18:11 · 12 answers · asked by jiles357 1 in Mathematics

0 ⤊

Equillibrium constants?

Okay another question

A mixture of .200 mol NO2 and .200 mol CO is placesd in a 1.00 L flask and given time to equilibriate. Analysis of the equillibrium mixture indicates that 0.134mol of CO2 is present calculate Kc for the reaction.

NO2+CO ---> NO + CO2

the answer is 4.1

I am unsure how to figure it out. please help.

2007-07-29 07:16:30 · 4 answers · asked by jo d 2 in Chemistry

0 ⤊

1 - sin²/1-cos = -cos?

Using Trigonometric Identites

help

2007-07-29 07:13:54 · 5 answers · asked by Bobby R 2 in Mathematics

2 ⤊

(Sin + Cos)² + (Sin - Cos)² = 2?

Using Trigonometric Identities.

Find the answer 2.

2007-07-29 07:10:43 · 8 answers · asked by Bobby R 2 in Mathematics

0 ⤊

Tan x Cot - Cos² = Sin²?

Using Trigonometric Identities.

has to equal Sin²

2007-07-29 07:09:11 · 5 answers · asked by Bobby R 2 in Mathematics

4 ⤊

Why does the moon shine so brightly on a full moon night?!?

I kno that it doesnt burn, so it cant have light.
I also kno that it is a reflection off the sun, but i can see 80 acres in a full moon light......
Somebody help me.....

2007-07-29 07:01:43 · 8 answers · asked by stupidpeoplehater 2 in Astronomy & Space

3 ⤊

solve by using the quadratic formula x2 - 3x = - 6x -1?

2007-07-29 07:00:38 · 5 answers · asked by peaches 1 in Mathematics

2 ⤊

solve by completing the square x^2 +6x +2 =0?

2007-07-29 06:58:09 · 5 answers · asked by peaches 1 in Mathematics

0 ⤊

What names is given to the type of doctor that analyzes DNA?

What is the name of the specialty that deals with doing DNA tests?

2007-07-29 06:57:02 · 8 answers · asked by KL 1 in Medicine

0 ⤊

Equillibrium question.?

A 4.00 L flask is filled .75mol of SO3 , 2.5 mol SO2 and 1.3 mol O2, and allowed to reach equillibrium. Predict the effect on the concentrations of SO3 as equillibrium is achieved by using Q, the reaction quotient. Kc= 12
the answer is[SO3] will decrease because Q
MY question is how do you get that

2007-07-29 06:55:15 · 2 answers · asked by jo d 2 in Chemistry

0 ⤊

what's the compound formed by 2 molecules of a carboxylic acid joined together by 2 hydrogen bonds?

2007-07-29 06:55:02 · 5 answers · asked by Dee Dee 2 in Chemistry

0 ⤊

How do sponges differ from all other animals?

Sponges are autotrophs.
Sponges lack a true body cavity.
Sponges exhibit radial symmetry.
Sponges lack true tissues.
Sponges have a true coelom.

2007-07-29 06:53:21 · 5 answers · asked by Anonymous in Biology

1 ⤊

Electrical or Aerospace ?

I just finish my first year of the B. of Engineering program and I have been accepted in the aerospace engineering but now my friends tell me aero is not fun, it's hard to get a job and they don't have good salaries.Now i am thinking of transfering to electrical engineering.What can you suggest me? can u please tell the advantages and disadvantages of both aero and electrical engineering ? I want to know everything about aero and electriacal,...

2007-07-29 06:50:16 · 6 answers · asked by Anonymous in Engineering

2 ⤊

Plane...shadow?

Would a plane in the air make a shadow bigger than the plane, smaller than the plane, or equal in size to that of the plane?

2007-07-29 06:49:52 · 10 answers · asked by symperl 2 in Physics

0 ⤊

if the one side of a triangle is 4 inches and the other sides are 11 inches what is the area of the triangle?

2007-07-29 06:44:53 · 6 answers · asked by sarah anne 1 in Mathematics

0 ⤊

Can someone explain approaching the speed of light?

There has to be a reference point to determine the speed of an object. Supposedly as you approach the speed of light mass and the energy required approach infinity. My question is how can you approach the speed of light without a reference point? Since everything is relative why would not the Earth approach infinite mass as it is backing away from me near the speed of light rather than my ship moving forward? I am trying to read "A Short History of Time" and that is where I get confused.

2007-07-29 06:41:17 · 5 answers · asked by Barkley Hound 7 in Physics