Chemistry - December 2007

2007-12-05 22:26:11 · 3 answers · asked by Chelsey 5

:distilled water, 0.0001M HCl, 0.0001M NaOH, and acetate buffer..the same set of solutions will be used in the next question....What will happen to the pH of these solutions after the addition of 0.0001M NaOH? thank u!!!!

2007-12-05 22:21:50 · 1 answers · asked by kiwi_frost 1

A.) Aluminum Clippings
B.) Copper Wire
C.) Salt
D.) Iron Nails

2007-12-05 22:18:09 · 2 answers · asked by Chelsey 5

if a matter is too small that it cannnot be divided I still wonder how from i came acrose some foundamental particles.
The reading have become difficult to understand since i think thaey are saying two different things. i therefore use this as an opportunity to be clearified please somebody that really care should help me out in a very simple way that i will understand i wait to get the answer .

2007-12-05 21:46:20 · 8 answers · asked by Anonymous

I don't understand how to do this...

What mass of glucose can be produced from a photosynthesis reaction that occurs using 10 mol
(( <sub>means subscript ))
CO2

6CO2(g)+6H2O(l) ---> C6H12O6 (aq) + 602(g)

Please and thank you so much! Your help is very appreciated.</sub>

2007-12-05 17:39:20 · 2 answers · asked by blackblue 1

Please help with these chemsitry questions

2007-12-05 16:59:51 · 2 answers · asked by Tonie M 1

if .2125 grams of a gas is in a container of 1.25 lter volume at a pressure of .838 atm. and 40c, what is the molecular weight of the gas.


i gonverted 40c to K =313K
but i've filled in all of my variables. . . what am i doing wrong
please help!

2007-12-05 16:27:57 · 5 answers · asked by Anonymous

Well I'm doing a science project so I wanna know

2007-12-05 16:18:39 · 11 answers · asked by Christina B 2

any help with this is life saving please explain the answer I don't want just the answer how does this conversion work??? THANKS IN ADVANCE FOR YOUR HELP!!!!!!!!!!!!!!!!!!!!

A. 1.76x10^-3 mol of Cesium
B. 0.0125 mol of Neon
C. 5.29 x10^3 mol of Lead
D. 0.00000122 mol of Sodium
E. 5.51 millimol of Arsenic
F. 8.72 mol of Carbon

2007-12-05 15:35:49 · 7 answers · asked by Sara 3

2007-12-05 15:31:41 · 2 answers · asked by iluvunda559 1

2007-12-05 15:30:55 · 3 answers · asked by ... 2

2007-12-05 15:30:17 · 2 answers · asked by iluvunda559 1

a large piece of copper placed over an iron nail vs a small piece of copper.. will that increase the rate of corrosion or not?

2007-12-05 15:26:11 · 4 answers · asked by Kipper to the CUP! 6

I got a PH testing kit and it tests from 6.2(light lime green) to 7.4(Sky blue). now my question is, if i tested a solution that was say in between 12 and 14 would it be dark blue? or would it be yellow? because i heard a ph reading of 12 would make yellow, but that doesn't make any sense since it gets darker blue on the chart the further the number goes up.

2007-12-05 15:21:54 · 2 answers · asked by Anonymous

Is it possible to rearrange the molecules in a substance? Could you change the amount of protons/electrons a atom has? Are there any occurrences of stuff like this in nature?

2007-12-05 15:06:20 · 3 answers · asked by Anonymous

neon signs employ neon in only one color: red. other gases are used in other colors. Neon was not even descovered as the first color in neon. it was mercury (blue).

i got this interpretation from this site:
http://inventors.about.com/od/qstartinventions/a/neon.htm

2007-12-05 14:46:35 · 3 answers · asked by white_maned_dragon 1

how can you tell if a bond is polar or nonpolar and how can you tell if a kind of molecule is polar or nonpolar. how do you determine the spape of the molecule( linear, bent, pyramidal, tetrahedral) can you explain how you know if an electron-dot formula is correct? I sort of know how to do this, but just not to sure.
.. ..
:Cl:Cl: is this correct?
" "
O::O is this correct?

2007-12-05 14:12:38 · 3 answers · asked by kukinney26 2

A 0.1964 g sample of quinine (c6H4O2) is burned in a bomb calorimeter that has a heat capacity of 1.56 kj/K. The termperature of the colorimeter increases by 3.2k Calculate the heat of combustion of quinine per gram and per mole.

Please help me, i'm clueless!

2007-12-05 13:36:27 · 2 answers · asked by bb 4

Initially there is a .500g sample of CuSO4.5H2O and a .245g sample of NH2CH2CO2H (glycine).

We find that there are .002002 moles CuSO4.5H2O and .003264 moles NH2CH2CO2H (glycine). What is the limiting reagent?

How many grams Cu(gly)2.H2O are expected based on the limiting reagent?

2007-12-05 13:35:52 · 1 answers · asked by oceanpotion™ 3

2007-12-05 13:32:03 · 4 answers · asked by mooman2220 1

A gas originally at 27 °C and 1.00 atm pressure in a 3.9 L flask is cooled at constant pressure until the temperature is 11 °C. The new volume of the gas is __________ L.

2007-12-05 13:26:46 · 3 answers · asked by gregmmercer 1

I'm really having trouble with chemistry homework... I dont want homework answers, I just want help on how to do something.

I have to find the specific heat of a Iron. I dont know how to do it. I also have to determine the heat gained by water that is in a calorimeter that had iron heated to 100C put into the calorimeter.

So basically, can somebody tell me how to find specific heat of water and of metal.

Also, it isnt just regular water, it is water heated at different temperatures.

2007-12-05 12:13:52 · 1 answers · asked by Harry D 1

Hi, is there an easy way to know if something is real solid 92.5 silver, and not sterling silver?

2007-12-05 12:08:34 · 2 answers · asked by Lola 4

2007-12-05 12:05:16 · 1 answers · asked by M.Bear 1

does the size of the sample injected in a GC affect the retention time?

2007-12-05 12:03:30 · 2 answers · asked by Anonymous

Solid barium carbonate is added to an excess of dilute nitirc acid

2007-12-05 12:01:23 · 1 answers · asked by moviefan254 1

Dilute sulfuric acid is added to a solution of lithium hydrogen carbonate

2007-12-05 11:57:39 · 1 answers · asked by aaadaj 1

2007-12-05 11:27:30 · 3 answers · asked by krishna 1

A. none of these

B. Yes, the partial pressure of oxygen in air increases with increasing altitude.

C. Yes, the partial pressure of oxygen in air decreases with increasing altitude.

D. No, the partial pressure of oxygen in air stays constant since the composition of air doesn't change.

E. No, the partial pressure of oxygen in air stays constant since the total pressure of air doesn't change.

2007-12-05 11:26:49 · 2 answers · asked by Anonymous

I have professor P.L Bastos for chemistry 102, in hunter college. how can i find old test exams or study for his tests? its generally 35 multiple choice questions.(1st part of general chem in college)

2007-12-05 11:25:09 · 5 answers · asked by lyudmila y 1