Science & Mathematics - 18 October 2007

in terms of molecular structure of the acids

2007-10-18 07:32:37 · 2 answers · asked by Anonymous in Chemistry

Methanol, CH3OH, can be produced by the following reaction.

CO(g) + 2 H2(g) CH3OH(g)
Hydrogen at STP flows into a reactor at a rate of 19.0 L/min. Carbon monoxide at STP flows into the reactor at a rate of 25.0 L/min. If 5.55 g of methanol is produced per minute, what is the percent yield of the reaction?

%

2007-10-18 07:32:29 · 1 answers · asked by My point exactly 5 in Chemistry

2007-10-18 07:30:47 · 2 answers · asked by damanjd1 2 in Chemistry

well heres one on my homework

x(x+2)
it tells me to expand it, Please help I don't understand it. Do i times the x * x and then x * 2?

to make = x (Tiny 2 after x) and then 2x

what happens when the sign is - awelll


help would be wonderful thankyou
Oh ime also 14, so try to be simple, thanks!

2007-10-18 07:29:24 · 4 answers · asked by Anonymous in Mathematics

please i need help

2007-10-18 07:28:40 · 6 answers · asked by consumer math help me 1 in Mathematics

A 50000kg ship sails east at 6m/s for 10 minutes. What is the net force acting on the ship? I thought this was so easy but I got it wrong...I had (50000kg*.01m/s^2)...is this because there is no acceleration?

2007-10-18 07:27:58 · 3 answers · asked by Erika H 5 in Physics

Parallel axis theorem is I = Io + Md^2

So say I have two spheres, equal weight and size, and I have a massless rod to hang them on. In one case I put the spheres on opposite ends and rotate about the middle of the rod -- it's really easy. In the second case I put both spheres on one end and try to rotate about the same point on the rod, it's much harder. This makes sense intuitively...

However, with a d-squared term, the moment of inertia shouldn't depend on where I put the spheres:
Case 1: I-total = Isphere + M(-D)^2 + Isphere + M(D)^2
Case 2: I-total = 2 * ( Isphere + M*(D)^2 ), which is the same.

But why, if the MOI is the same for both cases, is the balanced rod much easier to rotate?

It makes sense in my head, but not mathematically...

Thanks!

2007-10-18 07:25:59 · 1 answers · asked by Michael 4 in Physics

A. Proteins

B. Carbohydrates

C. Lipids

D. Monosaccharide

2007-10-18 07:25:07 · 5 answers · asked by Anonymous in Chemistry

what do i do divide ???
1. a circle with a diameter of 12-inches is inscribed in a square. What is the area of the circle? What is the area of the square?

2. Amy has just learned to ride a bicycle. Her tires have a circumfrence of 28-inches. She made it 392 inches befor falling. How many revolutions did she make ?

3. A circle with a diameter of 5-inches is inscribed inside a square. What is the area of the circle? What is the area of the square?

2007-10-18 07:25:04 · 2 answers · asked by I walk,my walk & Talk,my talk 3 in Mathematics

For the curves below verify that x'(0)=y'(0)=0 . Determine the derivative dy/dx at the point when t=0.

a.) x(t) = t^3 and y(t) = t^2
b.) x(t) = t^3 and y(t) = t^5
c.) x(t) = t^5 and y(t) = t^3
d.) x(t) = t^(3)-1 and y(t) = 2t^3

I have an exam tomorrow and this was a question on last years sample exam that was posted by my professor without solutions and I don't know how it's done. Please help!!

2007-10-18 07:23:32 · 1 answers · asked by Anonymous in Mathematics

2007-10-18 07:21:32 · 5 answers · asked by browneyedqt565 1 in Chemistry

Carbon tetrachloride can be formed by reacting chlorine with methane:

CH4 + 2 Cl2 à CCl4 + 2 H2

Given that the heat of formation of methane is –75 kJ/mol and the heat of formation of carbon tetrachloride is –135 kJ/mol, determine the heat of reaction.

Given the following equations and Ho values given below, determine the heat of reaction at 298 K for the reaction:
2 N2(g) + 5 O2(g) =2 N2O5(g)
2 H2(g) + O2(g) = 2 H2O(l) Ho/kJ = -571.6
N2O5(g) + H2O(l) = 2 HNO3(l) Ho/kJ = -73.7
N2(g) + 3 O2(g) + H2(g) 2 HNO3(l) Ho/kJ = -348.2
JUST FOR INFO Ho = delta h degrees

The specific heat capacity of aluminum is 0.900 J/oC g. How much energy (kJ) is needed to raise the temperature of a 8.50 x 102 g block of aluminum from 22.8oC to 94.6oC?

2007-10-18 07:21:11 · 1 answers · asked by Marlon P 1 in Chemistry

Did mass appear to be conserved during this chemical reaction? Use complete sentences for your answer. Yes or No is not an acceptable answer.

2007-10-18 07:14:24 · 1 answers · asked by Anonymous in Chemistry

it's that bit just below the belly button and before the YOU know what.... :D it always shows over their trousers.

2007-10-18 07:11:13 · 15 answers · asked by Anonymous in Biology

I know that when the copper(II)sulfate pentahydrate reacts with sodium hydroxide it yields copper hydroxide. Then copper oxide reacts with head to form copper oxide and H20.

2007-10-18 07:10:12 · 2 answers · asked by Anonymous in Chemistry

2 NO2(g) --->N2O4(g)
If 36.4 mL of NO2 gas is completely converted to N2O4 gas under the same conditions, what volume will the N2O4 occupy?

please help. i need to understand how to do this for my test. the answer would be nice so i can check my answers.

2007-10-18 07:09:41 · 5 answers · asked by My point exactly 5 in Chemistry

2007-10-18 07:07:35 · 1 answers · asked by Anonymous in Engineering

2007-10-18 07:07:28 · 12 answers · asked by Anonymous in Astronomy & Space

Is the mass of the universe increasing? Would this increase the strength with which gravity is pulling the universe back together?

2007-10-18 07:06:11 · 8 answers · asked by Chris tf 2 in Astronomy & Space

2007-10-18 07:05:58 · 3 answers · asked by nileshshivom 1 in Mathematics

2007-10-18 07:04:14 · 4 answers · asked by dz 1 in Chemistry

I am doing some work and im stuck on this question on kp can some1 plz help as I have a test tommorrow so a worked solution would really help me

In the gas phase PCL5 under goes thermal dissociation

PCl5 ----> PCl3 +Cl2 (note. reaction is reversible)

At a certain temperature, and at a total pressure of 3atm, 60% of the PCl5 originally present has dissociated when equilibrium is attained. Calculate the partial pressures of the gases at equilibrium and work out the value of Kp

Thankyou

2007-10-18 07:02:50 · 1 answers · asked by Anonymous in Chemistry

I know the D, Fo, Fe, LGP, and Mp
how I can i tell which telescope sufferes from Chromatic aberrtion?
How can i tell which has the worst resolving power?
how do i get the ratio of how much greater the light gathering power of the biggest is to the smallest?
and finally how would i sovle this questions what is th ehighest magnifing power you could get with these telescopes and eyepeices ( any of the telescopes with any of the eye peices.

2007-10-18 07:01:08 · 3 answers · asked by Cyrus The Great 3 in Astronomy & Space

Hands up, I haven't got a clue what its on about, let alone how to work it out.... so for the benefit of others like me, can someone please enlighten?

I've noticed quite a few such questions on site regarding calclulating hybridization....with little response, so I'm not the only one in the dark about molecular chemistry.... so can you please answer as detailed as possible for future searches....Thanks (on behalf of many)

2007-10-18 07:00:44 · 2 answers · asked by ~☆ Petit ♥ Chou ☆~ 7 in Chemistry

It is drinking your own urine for curing ailments.

2007-10-18 07:00:39 · 9 answers · asked by Anonymous in Medicine

2007-10-18 06:59:59 · 4 answers · asked by gypsi k 2 in Earth Sciences & Geology

Please give me the word on the --------------.

2007-10-18 06:59:32 · 3 answers · asked by bad gambler 1 in Geography

The desperate contestants on a TV survival show are very hungry. The only food they can see is some fruit hanging on a branch high in a tree. Fortunately, they have a spring they can use to launch a rock. The spring constant is 1400 N/m, and they can compress the spring a maximum of 10.0 cm. All the rocks on the island seem to have a mass of 330 g.

2007-10-18 06:56:46 · 2 answers · asked by rochesmk 2 in Physics

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2007-10-18 06:54:48 · 1 answers · asked by Anonymous in Chemistry

Please give me the word on the --------------.

2007-10-18 06:54:43 · 2 answers · asked by bad gambler 1 in Geography