Science & Mathematics - 5 December 2007

How will the equilibrium position of a gas-phase reaction be affected by changing the volume of the reaction vessel?

( i think the greater the volume, the less the concentration would be therefore the less the equilibrium position would be)

Are there reactions that will not have their equilibria shifted by a change in volume?
yes or no
Explain.

(I don't really know here so if you could explain it to me that'd be great)

2007-12-05 07:45:34 · 1 answers · asked by topback35 4 in Chemistry

Find h'(y) if h(y)=tan(e^(3y))


Ok, so i used the product rule, but i'm not sure if i'm suppose to..

This is what i got
f= tan(e^3y) g=e^3y

so i got
3e^3y*tan(e^3y) + sec^2(e^3y) * e^3y


is it correct?? if not, can u show me how please?

2007-12-05 07:43:19 · 3 answers · asked by Anonymous in Mathematics

1) tan4x - tan2x = 0 Answer: 0, pi/2, pi

2) √3cosx - sinx = 0 Answer: -4pi/3, -pi/3

I don't know how to simplify these. I ended up with tan4x = tan2x for the first question, which didn't make much sense to me.

2007-12-05 07:43:02 · 2 answers · asked by Dave H 2 in Mathematics

What will be the freezing point depression if 42.0 g of ibuprofen (C13H18O2) is dissolved in 975 g of naphthalene? Kf for naphthalene is 7.00˚C/m

What is the boiling point elevation of 200. g of water when 11.4 g of ammonia (NH3) is dissolved in it? The Kb of water is .52˚C/m.

When 2.04 g of a substance were dissolved in 7.84 g of solvent, the freezing point decreased by 3.5˚C. The Kf for the solvent is 2.8˚C/m. What is the molar mass of the substance?

A solution is prepared using 18.0 g of an unknown substance in 150.0 g water. The boiling point was elevated .34˚C from that of pure water. The Kb for water is .52˚C/m. Calculate the molar mass of that substance.

What mass of ethylene glycol (C2H6O2, molar mass 62.1 g/mol) must be added to 10.0 kg water to produce a solution that freezes at-10.0°C? Kf for water is 1.86C/m.

What is the molar mass of 10 g of an unknown substance that raises the boiling point of .250 kg of water .75˚C? The Kb for water is .52˚C/m.

2007-12-05 07:41:43 · 0 answers · asked by Anonymous in Chemistry

1. dy/dx=______
y=(2x–1)^8 –x + e

So i've tried everything, but for some reason i keep getting the wrong answer :( can u help?

2007-12-05 07:40:30 · 4 answers · asked by Anonymous in Mathematics

Consider the region in the plane enclosed by y = x^2 and y=x. We rotate this region about the line y=0. Find the volume of the resulting solid of revolution

2007-12-05 07:40:02 · 1 answers · asked by Anonymous in Mathematics

2007-12-05 07:37:58 · 14 answers · asked by Negra 2 in Mathematics

2-3[-4+6]÷ (-2)

I don't understand how to simplify and I really need some help with this. Any explanations as to the order of operations and what to do to actually simplify, and what simplifying really is would be a great help. I just started an Algebra class, and I feel so lost!

2007-12-05 07:37:02 · 5 answers · asked by Alize 2 in Mathematics

Some people might say that weather forecasts are not at all accurate,but my son has just asked me this question.So whats the true answer?Cheers

2007-12-05 07:33:07 · 13 answers · asked by jixer 3 in Weather

Calculate the freezing point of a solution that contains 8.921g of (NH2)2CO in 85.0g of water. (NH2)2CO does not ionize in water. (Kf for H2O is 1.86 C/m)

2007-12-05 07:32:35 · 2 answers · asked by cdavis337 2 in Chemistry

2007-12-05 07:31:05 · 9 answers · asked by Anonymous in Weather

Does anyone know what this code is in gates leves?
like change in to gates, AND gates etc!

module IOcont(DIN, RESET,CLK, serial_IO, AddrOut, chipSel,DataOut);
input RESET; //The reset signal.
input CLK; //clock
input serial_IO; // The serial port through which communication to the external
// system occurs.

input chipSel; // This is the handshaking signal from the external system telling the
// input IO controller that it is ready to send data

input[13:0] DIN; // A signal from the processor which tells the input
// IO controller to receive data from the external signal

output [13:0] AddrOut; // The 14 bit data is converted into a parallel 14 bit data,
// then stored in AddrOut register.

output [2:0] DataOut;

reg [13:0] AddrOut;

always begin
if(chipSel == 1)begin
AddrOut = DIN;
end
else begin
AddrOut = AddrOut;
end
end

endmodule

2007-12-05 07:29:03 · 2 answers · asked by Anonymous in Engineering

The proton is at x= -d and the electron is at x= +d. They are released simultaneously. and the only force that affects their motions is the electrostatic force of attraction that each applies to the other. Which particle reaches the origin first? Why?

2007-12-05 07:22:24 · 2 answers · asked by Michaela G 1 in Physics

what role do angle bisectors of a spherical triangle play in their polar triangle?

is the incenter of a triangle also the incenter of its polar triangle?

2007-12-05 07:21:06 · 2 answers · asked by Anonymous in Mathematics

With threat effort the scientist finally managed to achieve minimum muzzle velocity necessary to success of his mission.
After nearly missing one satellite the cannon ball landed on the South pole.

How much time did the cannon ball spend in space?
(Assume that radius of the GSS orbit is large compared to radius of Earth)

2007-12-05 07:18:18 · 5 answers · asked by Alexander 6 in Physics

If you know the diameter of an asteroid, how do you find the volume?

2007-12-05 07:16:28 · 6 answers · asked by Miss Realistic 2 in Astronomy & Space

how do i write the reaction equation?

and why does the light go out, i dont really understand can you help me.

2007-12-05 07:13:06 · 6 answers · asked by jen27 1 in Chemistry

2007-12-05 07:09:29 · 12 answers · asked by Fay B 2 in Astronomy & Space

How are thoughts in your brain composed as matter? Everything is matter, so how do thoughts, memories, insights, and deep thinking fit in with that?

2007-12-05 07:09:19 · 14 answers · asked by Anonymous in Physics

it's 1 of my fav. movies! was it that dramatic, do you remember it?

who are those people at the command center or what is it called, those people at houston (u kno, houston we have a problem)? what do they do? they're awesome

2007-12-05 07:08:17 · 14 answers · asked by o0♥0o 1 in Astronomy & Space

What volume of O2(g) collected at 27 degrees C and 746 torr, would be generated by decomposition of 125g of a 50% by mass hydrogen peroxide solution?

2007-12-05 07:04:30 · 1 answers · asked by HaiLeY 4 in Chemistry

????

2007-12-05 07:04:24 · 2 answers · asked by Emily 2 in Weather

i hear them talking about it on the radio and would like to know so i can converse in this subject

2007-12-05 07:02:12 · 2 answers · asked by gonzalo p 1 in Chemistry

I've written down CH3CH(OH)COOH but I dunno if it's right

Also, what can you see when a colourless solution containing silver ions is tested with a solution containing chloride ions.
And what observation (if any) can you see when excess of aqueous ammonia is added to the mixture above.

2007-12-05 06:56:56 · 3 answers · asked by Anonymous in Chemistry

2007-12-05 06:51:59 · 13 answers · asked by Anonymous in Botany

2007-12-05 06:51:36 · 4 answers · asked by Simba 2 in Chemistry

Ok guys I know there are many question asking if DDT should be brought back or not. And there is also a famous book by Rachel Carson "Silent Spring". What do you think should be done. And is DDT the only pesticide to eradicate the pest problem.

2007-12-05 06:51:22 · 2 answers · asked by S 1 in Botany

2007-12-05 06:49:41 · 8 answers · asked by madi 1 in Astronomy & Space

http://antiques.about.com/gi/dynamic/offsite.htm?zi=1/XJ/Ya&sdn=antiques&cdn=homegarden&tm=14&gps=101_100_1089_773&f=00&su=p284.8.150.ip_&tt=14&bt=1&bts=1&zu=http%3A//www.glassencyclopedia.com/goldrubyglass.html

2007-12-05 06:48:15 · 3 answers · asked by hwgramm 3 in Physics

I know.

How can a 400 ton plane stay in the air when physics say everything that goes up must come down. When people fall off a building why does'nt the air support them to fly?

2007-12-05 06:47:19 · 5 answers · asked by grfisgd 6 in Physics