Chemistry - March 2007

2007-03-12 05:13:12 · 4 answers · asked by i-sena 1

2007-03-12 05:09:54 · 2 answers · asked by i-sena 1

here is the question.
which of the following statements is true of 19.0 g of Fsub2(g) at STP?

a. it occupies a colume of 22.4 L
b. it contains the smae number of molecules as 1/2 mol of Osub2(g) at STP
c. it only exists in the form of ions
d. it contains 6.02 x10^23 molecules.
e. none of the above.

i have no clue! what is STP?

2007-03-12 05:03:52 · 4 answers · asked by ashesanne 2

5.77 g of nitrous acid ( HNO2 ) is added to water to make a final solution of 444 ml.
What is the pH of the solution ?

Use Ka = 4.50 x 10-4 at 25.0oC.

Use the approximation that x << the initial concentration

2007-03-12 04:53:25 · 4 answers · asked by Foxychick 1

physical science

2007-03-12 04:50:13 · 4 answers · asked by Baby Gurl 1

what mass of solution is contained in 417 mL of a 0.314 M magnesium flouride solution? omg im so stuck!

2007-03-12 04:49:25 · 3 answers · asked by ashesanne 2

Does anyone know anything about why this forms (xenon being a noble gas etc). Only asking since i've just started transition metal chemistry which goes into ligands. Exclude stuff about its shape and coordination geometry (octahedral and square planar etc) unless where relevant. Thanks.

2007-03-12 04:41:51 · 1 answers · asked by Antimonic 2

2007-03-12 04:36:29 · 9 answers · asked by ·ç»Ê ¬ 1

I am really stuck in here... no idea what the answer is...
help greately apreciated =)

2007-03-12 04:29:24 · 1 answers · asked by Lara M. 3

if the temperature of an ideal gas is raised from 100 degrees c to 200 degrees c, while the pressure remains constant, the volume does what?
does it double? stay the same? im confused!

2007-03-12 04:19:52 · 5 answers · asked by ashesanne 2

I would very much like to cut down on my consumption of red meat. I'm interested in adding more fish to my diet, but my boyfriend and I are concerned about the levels of heavy metals in fish. How can I minimize the incidence of heavy metal in the fish that I buy? What should I do to make sure that the fish I eat will be good for me? Are there specific places in the world from where the fish is more "pure" than other places? What types of fish are usually affected most by heavy metals in the environment? Is there a chart or graph somewhere online that I could look up?

2007-03-12 04:04:44 · 2 answers · asked by Anonymous

then give the correct name for each isomer, can more than one of your isomers have the same name and can you place the Cl and Br on the same Carbon atom?

2007-03-12 03:54:20 · 3 answers · asked by tranceaddict 1

I have been asked to determine the number of barium and oxygen atoms in a unit cell of barium oxide.
Do i count each corner barium as an 1/8 and each side atom as a half?

2007-03-12 03:52:10 · 2 answers · asked by tranceaddict 1

A weak base B forms the salt BHCl, composed of the ions BH+ and Cl-. A 0.164 M solution of the salt has a pH of 4.43. What is the value of Kb for the base B? Enter your answer in the form xE-y. Do not use units.

2007-03-12 03:44:11 · 1 answers · asked by Ryan C 1

2007-03-12 03:27:32 · 2 answers · asked by fama 1

2007-03-12 03:10:56 · 2 answers · asked by veloxify 1

Determine the pH of the following solutions:
Remember that 1.0 molar=1.0M = 1.0mol/L = 1.0 mol.L^-1

a) 1.0M hydrochloric acid, HCl
b) 0.1 M nitric acid
c) 0.5 mol.L^-1 nitric acid
d) 5.3 x 10^-3 mol.L^-1 hydrochloric acid
e) 0.02 mol/L sodium hydroxide
f) 0.1 M potassium hydroxide
g) 0.05 M barium hydroxide Ba(OH)2

2007-03-12 03:07:45 · 3 answers · asked by hiscageofstars 1

2007-03-12 03:06:41 · 2 answers · asked by METHENOL 1

1.) AgCH3COO + Na3PO4 -> Ag3PO4 + NaCH3COO


2.) NaOH + H2SO4 -> Na2SO4 + H2O


3.)NaCl + H2SO4 -> HCl + Na2SO4


Are they balanced? . . . thanks.

2007-03-12 03:01:16 · 5 answers · asked by Zigma 7 2

explanation please

thanx

2007-03-12 02:51:05 · 3 answers · asked by Tommy 2

If 2.0 g of NaOH dissolved in 250 ml of water, what will be the molarity of the resulting solution?

Show me how you did this too please. Thanks!


AND...
If the endpoint in the titration of HCl with NaOH is mistakenly passed (to pink) what effect (high, low, no effect) does this have on the calculated molarity of the NaOH? And explain it to me please.

Thanks everyone!

2007-03-12 02:29:09 · 2 answers · asked by Angel Eve 6

Can anybody tell me what is the only thing you can burn

2007-03-12 02:26:35 · 6 answers · asked by alan b 1

sodium, silicon, tetrachloromethane, argon, potassium bromide

2007-03-12 02:21:12 · 2 answers · asked by jumpy789 1

2007-03-12 02:20:38 · 2 answers · asked by i-sena 1

sodium, silicon, tetrachloromethane, argon, potassium bromide

2007-03-12 02:18:49 · 1 answers · asked by jumpy789 1

2007-03-12 02:10:57 · 1 answers · asked by Elena B 2

2007-03-12 01:51:31 · 2 answers · asked by Anonymous

2007-03-12 01:49:44 · 2 answers · asked by Anonymous

a. enantiomers
b. not isomers
c. constitutional isomers
d. conformers
e. diastereomers

2007-03-12 01:37:17 · 2 answers · asked by chs 1

lead (II) chloride, warm and cold water (10 & 100 degrees C)
mercury (II) chloride, warm and cold water (10 & 100 degrees C)

if you have access to a CRC handbook and could get these values i would greatly appreciate it!

please have solubility in grams/100 g water

2007-03-12 01:30:49 · 1 answers · asked by volleying13 1