Chemistry - January 2007

where can i find articles about electrochemical cells, polyelectrolytes, ampholytes,fuel cells, dry cells.....???
i need a website... please help please help please help please help...... please... kudasai kudasai kudasai

2007-01-22 16:12:23 · 1 answers · asked by iluvsummahtangerines... 1

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water.
4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq)

(a) Determine the mass of gold that can be extracted if 24.9 g sodium cyanide is used.
g
(b) If the mass of the ore from which the gold was extracted is 167.5 g, what percentage of the ore is gold?
%

2007-01-22 15:36:31 · 4 answers · asked by hmmmmmmmm 1

2007-01-22 15:36:12 · 5 answers · asked by Anonymous

what will be the volume at 800 mm Hg, 700 torr and 2.0 atm?

2007-01-22 15:26:52 · 5 answers · asked by lhyne d 1

2007-01-22 15:25:58 · 7 answers · asked by Anonymous

Would it still be 22.4 liters like any other element, or would it be 44.8 liters since it's diatomic?

Please and thank you!

2007-01-22 15:15:33 · 5 answers · asked by CathyH 3

2007-01-22 15:08:31 · 4 answers · asked by simplyrockbabe 1

can you explain to me how you did it?

2007-01-22 15:04:04 · 7 answers · asked by xXUntouchableXx 3

What volume will a sample of hydrogen occupy at 28.0 degrees celsius if the gas occupies a volume of 2.23 dm3 at a temperature of 0.0 degrees celsius? assume that the pressure remains constant. (remember to change to Kelvin). the answer is 2.46 dm3

dm3 = decimeters cubed = 1 L.

i got 2.022 dm3 but i do not think that is right even if you make it into sig figs..

2007-01-22 14:57:36 · 3 answers · asked by Anonymous

??

2007-01-22 14:52:14 · 7 answers · asked by kneegr0w_j0hn 2

what will be the volume at 800 mm Hg?

2007-01-22 14:51:16 · 4 answers · asked by lhyne d 1

2007-01-22 14:40:45 · 4 answers · asked by Anonymous

2007-01-22 14:29:25 · 1 answers · asked by steaua 3

2007-01-22 14:14:20 · 4 answers · asked by Rimi M 1

The question is:
Gold occurs in seawater at an average concentration of 1.1X10^-2 parts per billion. How many liters of seawater must be processed to recover 31.1 g of gold assuming 79.5% efficiency (density of seawater = 1.025 g/mL)

any help would be great! If you could explain it and help me to get it on my own even better.

2007-01-22 13:57:36 · 1 answers · asked by meanest_pianist 2

How do you find the water vapor pressure in mm Hg's from the temperature? I need the formula. PLEASE. !!

for example. if it were 12 degrees celsius, what would the water vapor pressure be? like that.

2007-01-22 13:46:58 · 2 answers · asked by Anonymous

what are the major sources of error in your determine of the molar gases?

2007-01-22 13:46:20 · 3 answers · asked by Nicole J 1

2007-01-22 13:45:06 · 2 answers · asked by Anonymous

How does a chemical equation relate the macroscopic, observable reaction to the interactions occuring at the microscopic level?

2007-01-22 13:38:35 · 1 answers · asked by SICK MY DUCK! 1

like when they're written out in a chemical formula, how do u know if it's ionic or covalent? i need this asap

2007-01-22 13:19:16 · 10 answers · asked by Anonymous

and just for personal info, if the batteries DO seem crusty, etc. from contents leaking out, is that dangerous at all? how to handle that?

2007-01-22 13:16:37 · 2 answers · asked by Anonymous

Hey everyone. I'm reviewing for my chemistry midterm and wanted some clarification on a problem I came across.

The question is...

True or false:
"An element that has an electron configuration of 1s^22s^22p^63s^23p^63d^34s^2 is a transition element"

Now at first I thought it was false because the 4s^2 identifies an alkali earth metal, not a transition element. However, the 3d^3 is throwing me off. What is the significance of the 3d^3 and what element is described by this orbital?

2007-01-22 13:15:55 · 2 answers · asked by skiiermandan 3

I need help predicting reactions:

PbSO4 + AgNO3

NH3 + H20
Can you also tell me how to do them.

Thanks in advance

2007-01-22 13:13:28 · 2 answers · asked by Anonymous

How do you separate a mixture of sand and Potassium Dichromate (VI)

2007-01-22 12:59:06 · 1 answers · asked by Auriella H 1

How many grams of NaAlO2 can be obtained from 4.46 g of AlCl3 according to the following reaction?

AlCl3(aq) + 4NaOH(aq) →
NaAlO2 (aq) + 3NaCl(aq) +2H2O(l)

2007-01-22 12:57:08 · 1 answers · asked by San Fran Kid 2

Do you think pennies should be considered pure substances? Give specific explanations on why you think so and some websites. =]
Thank you!

2007-01-22 12:47:36 · 3 answers · asked by Wonders 1

1)3NO2 (g) + H2O (l)>>>NO (g) + 2HNO3(aq) .How many mol of water is needed to react w/8.4 mol NO2?
2)P4(s) + 6F2 (g)>>4PF (g) .How many grams of fluorine is needed 2 react w/6.20g of phosphorus?
4)according to the balanced equation for the combustion of ethane, C2H6, 2C2H6(g) + 7O(g)>>4CO2(g) + 6H2O(l), for every molecule of ethane that reacts, CHOOSE RIGHT ANSWR:
(A)2 molecules of carbon dioxide r produced (B) 3 molecules of water is produced (C)A&B D)neither
68) write formula for each compound
A)aluminum carbonate
B)silicon dioxide
C)potassium sulfide
D) manganese(II)Carbonate
E) sodium bromide

2007-01-22 12:45:13 · 1 answers · asked by truckin_90 2

what is the element Neon, at room-tempature? a gas, liquid, ext???

2007-01-22 12:36:12 · 3 answers · asked by Bebe's Angel 2

Cu(s) + H2O ->
Sr(s) + H2O ->

2007-01-22 12:29:04 · 1 answers · asked by magln j 2

Bonding of Substance is essential. Define Ionic, Covalent and Hydrogen bonds and explain why bonding is essential to matter and its use in the world today

2007-01-22 12:18:02 · 1 answers · asked by Anonymous