Chemistry - April 2007

2007-04-26 00:15:30 · 13 answers · asked by -Gentz - 1

Faraday constant: 96485 J V-1 mol-1
Molar gas constant: 8.314 J mol-1 K-1
Standard temperature: 298 K

The relationship between kJ and J needs to be considered I believe.. It has kept throwing me off..

2007-04-25 23:34:47 · 3 answers · asked by Anonymous

2007-04-25 23:32:49 · 2 answers · asked by blubbablub 1

2007-04-25 23:17:52 · 5 answers · asked by silly_mi_91 1

A. It exposes some parts of the Earth to more direct sunlight, which causes summer or less direct sunlight , which causes winter.
B. It causes rainfall or drought in some parts of the Earth
C. It brings about tropical depressions or monsoon rains in some parts of the Earth
D. It brings about longer days or shorter days in some parts of the Earth
E. none of the above

2007-04-25 23:11:45 · 4 answers · asked by cloud 1

Ok i did the first part which was finding out the HI, but i cant think how to do the later of this problem, the finding initial concentration.::::




The equilibrium constant for the gas phase reaction H2 + I2<=>2HI is 54.8. The equilibrium concentration of HI is 1.735740303 and the equilibrium concentrations of H2 and I2 are
0.153 and 0.357 mol L-1 respectively.

Calculate the initial concentration of H2 if no H2 was present at
the start of the reaction

2007-04-25 23:01:04 · 1 answers · asked by linzeeloulou 1

2007-04-25 22:19:06 · 3 answers · asked by mike_online_now 3

General Chem help!!!!?

AKKKKK I'm freaking out here!!! pleasseeee help I have to get this quetion right or else I'm screwwed

Match each species below with the correct number of d electrons (n of dn) for the central metal ion.
1) [RhCl6]3- A. 6
2) Na2[Os(CN)6] B. 4
3) [Mn(CN)6]2- C. 8
4) [Ru(NH3)5Cl]SO4 D. 5
5) Ca[IrF6] E. 3
F. 7

I'm pretty sure 5 is B but not so sure about the others!!! Thanks so much! :))))

2007-04-25 22:10:56 · 2 answers · asked by blondefuss 1

Among the complex ions formed by Co3+ are the 4 listed below. Match each ion to its correct color.

1) [CoF6]3- A. blue
2) [Co(CN)6]3- B. yellow-orange
3) [Co(NH3)6]3+ C. pale yellow
4) [Co(H2O)6]3+ D. green

I'm pretty sure 2 is C but I don't know about the others... HELP!!!!

2007-04-25 21:56:52 · 1 answers · asked by blondefuss 1

help plz to egalate this equation:
Fe + HNO3 -> Fe(NO3)3 + NO2 + H20

2007-04-25 21:42:38 · 3 answers · asked by LMZ 1

20 yo wants to try

Abby Hoffann is dead not in the Book "Steal this Book"

2007-04-25 21:42:23 · 5 answers · asked by david786 4

it is a proven fact that salt water is a better electrical conducter than distilled water. why did my nail rust quicker than 3 others, all with 4 mL of water each and 1,2 and 3mL of salt?

2007-04-25 21:33:51 · 3 answers · asked by thevendingmcahine 2

anyone give me some help please ?

2007-04-25 21:23:30 · 2 answers · asked by livefast_dieyoung 2

1. Usually, president, in formal meeting wearing a "clothes" after he wear a white shirt. what is that "suit " called? (look like tuxedo but not tuxedo)

2. what is the different between dining jacket, tuxedo, and the "suit" in my number 1 question.

thanks

2007-04-25 21:08:09 · 3 answers · asked by la montée 4

2007-04-25 21:06:53 · 3 answers · asked by Anonymous

1) What does entropy mean? Examples? When is order or disorder? And when is it high and low? Unfavorable and favorable?
2) I need examples of endothermic and exothermic? I know endothermic is in and exothermic is out but not specifically understand the meaning thought.
3) when is something spontaneous and unspontaneous?

And that's about it. Thank you very much. Your explanations hopefully will clear things up for me. Appreciate it!

2007-04-25 20:54:05 · 2 answers · asked by ph103 1

want to make at home

2007-04-25 20:48:28 · 5 answers · asked by david786 4

Aqueous iodide ion is oxidized to I2(s) by (Hg2)+2(aq) in an acidic solution. What is the E'cell and delta G?
Needed information: I2(s)+2electons-->2I-(aq) E'(V)=+.536
and Hg+2(aq)+2electrons-->Hg(l) E'(V)=+.854

I need this by morning because I have a test tomorrow- the answer to this is not E'cell is .318!!! Please show me work...thanks!!

2007-04-25 20:47:06 · 2 answers · asked by sugardaddy8815 1

carboxylic group of polyamic acid.

2007-04-25 20:34:26 · 1 answers · asked by k c 1

hi.. im a student at high school and need this question answered. I dont quite understand how they're different from eachother yet understand the properties that both have in common.. thank you xx

2007-04-25 20:22:59 · 6 answers · asked by simonaaa <3 1

Which 3 Elements? And what was the name of the Swedish Town?

2007-04-25 20:14:53 · 2 answers · asked by Anonymous

2007-04-25 19:56:18 · 2 answers · asked by Kristy 2

2007-04-25 19:54:48 · 3 answers · asked by Kristy 2

I need to find the pH of 50 ml of 0.50 M K2HPO4-.

Ka1 for H3PO4 is 7.11x10^-3.
Ka2= 6.34 x 10^-8
Ka3= 4.30x10^-13.


Thanks!

2007-04-25 18:57:35 · 1 answers · asked by Mr Dawg 1

The half-life of iron-59 is 45.10 days, so give your answer in days.

2007-04-25 18:55:08 · 1 answers · asked by Anonymous

1. One antacid contains 334 mg of active ingredient, NaAl(OH)2CO3. Calculate number of mmol of HCL that the table can neutralize. The Neutralization produces NaCl, AlCl3, and H2O.

2. sample of 70.5 of potassium is added to 15ml of .050M silver nitrate. Calculate the theoretical yield of the precipitate that formed.

3. What volume of .500M BaCl2 is required to completely react with 4.32g of Na2SO4?

For each of these i now that i will need to find the limiting reactant, but whats next?

2007-04-25 18:52:05 · 1 answers · asked by wqel12 1

If your calculated value of Q is 0.608 for your sample that contains 100.0 mL of 0.000200 M KSCN and 3.00 mL of iron solution (the third sample), what is the value for the equilibrium concentration of the iron-thiocyanate complex, [Fe(SCN)2+]eq ?

Can anyone help me with this problem?

2007-04-25 18:43:19 · 1 answers · asked by Anonymous

Why is high pressure needed in HPLC? And What is a bonded phase in liquid chromatography?

2007-04-25 17:36:07 · 1 answers · asked by Anonymous

an experiement is to be performed to determine the mass percent of nitrate in the solid mixture of iron (II) nitrate, iron (III) chloride, and iron (III) sulfate. Explain how please!

2007-04-25 17:30:40 · 3 answers · asked by Anonymous

Could someone tell me the specific heat of copper and cite it from the Merck Index, preferably the 10th or 13th edition>?

and if u could put it in Joules / gram * celcius degrees

2007-04-25 17:25:17 · 1 answers · asked by chowee21 2