Chemistry - March 2007

2007-03-21 22:35:10 · 8 answers · asked by S.N.Rao 2

2007-03-21 21:50:35 · 4 answers · asked by mrsjoshgroban 1

please give a short explantaion thanx

2007-03-21 21:42:06 · 4 answers · asked by Anonymous

Can anyone PLEASE balance this chemical equation for me:

Fe2O3+CO ---> FE+CO2

(all numbers being subscripts)

2007-03-21 21:18:19 · 4 answers · asked by Anonymous

elaborately explained chemical reaction mechanisms.

2007-03-21 20:50:24 · 2 answers · asked by vulcan_m 3

Continuing from a previous question on here, does the following isomer of C6H14 (Hexane) exist, and what is its name?

"http://img153.imageshack.us/my.php?image=c6h14wz6.jpg"

2007-03-21 19:42:23 · 2 answers · asked by Siddy 1

I have a closed system which is at X degree celcius. I decide to increase the temperature by 30 degree celsius and make it remain there. The reaction taking place is:

A + B --> C + D (it's a reversible reaction)
(enthalpy change is negative-> Exothermic)

I know the reaction will move to the left, but will the temperature of the system be X? Or X + 10?

I mean the reaction is moving backwards in order to eliminate these disturbance in temperature, will it succeed in lowering the temperature to X? Or will it keep trying?

2007-03-21 19:42:12 · 2 answers · asked by Chocolate Strawberries. 4

what is Mol/L. wat does it mean?

2007-03-21 19:03:11 · 4 answers · asked by K&E4life 1

107.0 mL of a solution of quinine contains 214.0 x 10-3 mol of quinine.
If this is titrated with 0.200 M HCl, what is the pH half-way to the stoichiometric point ?

Quinine is monobasic with Kb = 7.90 x 10-6

I know the steps to take but my answer is not coming out right

2007-03-21 18:40:36 · 1 answers · asked by Christie 1

I know the balanced equation is 2KOH+H2SO4-> K2SO4+2H2O but i'm not quite sure how to solve it. Thanks for any input you give!

2007-03-21 18:17:03 · 6 answers · asked by Parry 1

In the following relationships, Q stands for quinine and QH + for its protonated form


a) [ QH + ] > [ Q ]


b) [ Q ] > [ QH + ]


c) [ Q ] = [ QH + ]


Using the letters for the above relationships identify the dominant quinine species for each of the following steps of the above titraion.


I. At the start of the titration


II. At the halfway-point


III. At the equivalence point

2007-03-21 18:14:41 · 1 answers · asked by stargazer 2

The combustion process is:
CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l)
If 15.0 moles of CH4 are reacted, what is the volume of CO2 (in liters) produced at 23.0 degrees C and 0.985 atm?


.. the answer is 370 L .. just dont know how to get it! please help!

2007-03-21 17:55:50 · 4 answers · asked by M 3

i have a whole set of questions to do and i dont understand two of them out of all of them. any help will be great! thanks!<3

47) 2C2H6 + 7O2 ---> 6H2O + 4CO2
A) ----56 grams of C2H6 is combusted. how many liters of H2O will be produced at a pressure of 0.66 atm and 375 K?
B) ----how many liters of O2 will be needed to produce the water?

72) NaNO3 ---> Na2O + N2O5
A)----how much NaNO3 in grams would you need to produce 145.6L of N2O5, at 575 K and 124.6kPa?

2007-03-21 17:29:01 · 2 answers · asked by Anonymous

2007-03-21 17:27:44 · 12 answers · asked by Anonymous

There are _________ atoms of oxygen are in 300

molecules of CH3CO2H ??

A. 600
B. 3.61 X 10^26
C. 300
D. 3.01 X 10^24
E. 1.80 X 10^26

Do we just convert moles to atoms? or what exactly. Thank you

2007-03-21 17:18:37 · 2 answers · asked by Anonymous

which one has a common isotopic form and is the basis of the atomic mass unit (amu)?

2007-03-21 17:16:37 · 2 answers · asked by Anonymous

2007-03-21 17:06:13 · 7 answers · asked by chen333 2

which chemical law makes this statement?

2007-03-21 17:04:43 · 4 answers · asked by Sebastian 2

102.0 mL of a solution of quinine contains 193.8 x 10-3 mol of quinine.
If this is titrated with 0.200 M HCl, what is the pH half-way to the stoichiometric point ?

2007-03-21 16:40:29 · 1 answers · asked by Anonymous

2007-03-21 16:38:06 · 1 answers · asked by lukeluisback 1

ethane C2H6 at 118.0oC and 803 torr

2007-03-21 16:29:17 · 2 answers · asked by JD 1

What is the half-life of a first-order reaction if it takes 4.8x10^-3 seconds for the concentration to decrease from 1.33M to 0.51 M?
I think the answer is 3.5x10^-3 s, which is one of the options but I am not getting exactly that, I am a little off.
Please explain!
Any chemistry advice welcomed!!!

2007-03-21 16:28:19 · 2 answers · asked by ~~Shelly~~ 2

P = 665 torr

V = 981 mL

T = 39.0 oC

2007-03-21 16:27:10 · 2 answers · asked by JD 1

V = 0.141 L

n = 0.194 mol

T = 39.0 oC

2007-03-21 16:26:32 · 1 answers · asked by JD 1

One of the components of polluted is NO. It is formed in the high-temperature environment of internal combustion engines by the following reaction:
N2(g) + O2(g) ----> 2NO(g) delta H=180 kJ

Q: Why are high temperatures needed to convert N2 and O2 to NO?

2007-03-21 16:25:24 · 1 answers · asked by KG 1

to yield 70.5g of NO

2007-03-21 16:19:05 · 2 answers · asked by asusam 1

I am writing a lecture outline for a class and need a few more key concepts. Anything will help

2007-03-21 16:14:57 · 3 answers · asked by Anonymous

2007-03-21 16:06:24 · 0 answers · asked by Anonymous

Consider the following molecules:

A) SF6
B) F2
C) SF4
D) PF3
E) CF4


Which one of these molecules has bonds that are most polar?
Which have a molecular dipole moment?

2007-03-21 16:05:53 · 3 answers · asked by socr8711 2

How do you write a chemical equation, for methyl amine (CH3NH2) and nitric acid (HNO3) in water?

Is it:
CH3NH2 + HNO3 + H2O <=> CH3NH3 + NO3 (-) + H2O ?

2007-03-21 15:58:17 · 4 answers · asked by Anonymous