Chemistry - May 2007

2007-05-02 04:02:36 · 12 answers · asked by miss impulsive 2

2007-05-02 03:47:01 · 2 answers · asked by jiao 1

(i)carbon dioxide dissolved in Xs of NaOH(aq)
(ii)water has HCl gas dissolved in it
(iii)boron trifluoride rects wi th NaF??

2007-05-02 03:43:12 · 6 answers · asked by Anonymous

Well were doing this unknown lab where we have to seperate sand and salt from a mixture of sand and salt and have the weight in grams of each substance how do you seperate the sand and salt to weigh each and we cant use a sifter-- not that it would help much any way but... How do you go about completing this experiment>> thanks

2007-05-02 03:20:59 · 4 answers · asked by jaimie r 2

2007-05-02 03:20:29 · 1 answers · asked by Peter 2

We have vinegar with low pH, water in the 6-8 range.

2007-05-02 02:04:30 · 9 answers · asked by Bradley 2

Chlorine by the electrolysis of brine solution according to the equation 2Cl-(aq) -2e > Cl2 (g)

2007-05-01 22:37:01 · 1 answers · asked by Paige S 1

Please help me....

Recation
CaCo3(s) + H+ <=> Ca2+ + HCO3-

Given condition
[Ca2+] = 1mM, [HCO3-] = 1mM, pH = 6

2007-05-01 22:32:53 · 1 answers · asked by maripipi 1

2007-05-01 22:32:00 · 3 answers · asked by Alex 1

the rate of effusion of a particular gas was measured and found to be 15.1ml/min. under the same conditions, the rate of effusion of pure propane (CH3CH2CH3) gas is 35.8ml/min.

what is the molar mass of the unknown gas?
thx

2007-05-01 22:23:56 · 1 answers · asked by Anonymous

H2CO3
H2SO4
H2S
HCl

thx

2007-05-01 22:19:37 · 3 answers · asked by Anonymous

thx

2007-05-01 22:18:34 · 4 answers · asked by Anonymous

thx

2007-05-01 22:16:27 · 2 answers · asked by Anonymous

I am doing a science fair project and I already know that if you heat amethyst it becomes citrine, and citrine in beta radiation it becomes amethyst... But I can't find anywhere on how I would create and control beta rays...

Is it possible for me to do? I already know they are very harmfull to skin and all that but if I could get any help on how to create beta rays (that I can control) that would be awesome! =)

Or if you possibly know another way to turn citrine back into amethyst that would also work =D although I only know of the beta rays...

2007-05-01 21:49:27 · 2 answers · asked by ChronoX 1

Calculate Delta So for the formation of Cu2O(s) from its elements.

I thought it is just So(Product) - So(Reactant) but I get it wrong.
I think it is because I don't have the right equation for the formation reaction.
(Cu(s) + CuO(s) -> Cu2O(s))

Why am I wrong???? Please help me????

2007-05-01 21:30:48 · 1 answers · asked by jklovests 1

if you had produced a purple color, what would you that tell you about the relative concentrations of Co(H2O)6^2+ and CoCl4^2- in that solution?

2007-05-01 20:59:52 · 1 answers · asked by Anonymous

2007-05-01 20:48:16 · 1 answers · asked by Sara C 2

2007-05-01 19:34:19 · 1 answers · asked by Radjiyev A 1

please help

2007-05-01 19:27:24 · 3 answers · asked by tammysmith302 1

2007-05-01 19:23:27 · 2 answers · asked by Radjiyev A 1

Okay I know that amonnium is NH4 and carbonate is CO3. so to find the amount of ammonium ions would I take the .837 g divided by 1 mole of amonnium carbonate multiplied by 1 mole of ammonium? confused

2007-05-01 19:19:46 · 3 answers · asked by Walachka 3

i want help to choose exact combination of water washable base. What should be the combination of base What are its components.What governs its selectivity.

2007-05-01 19:01:26 · 4 answers · asked by anil n 1

What is the pH of a buffered system made by dissolving 17.42 g of potassium dihydrogen phosphate and 20.41 g of potassium hydrogen phosphate in water to give a volume of 200.0 mL? Ka2 = 6.2 x 10-8 for the dihydrogen phosphate anion.

2007-05-01 18:12:33 · 1 answers · asked by Anonymous

HNO3 + H2O ----->H3O+ + NO3-
HF + H2O -------> H3O+ + F-
<---------

F-
H2O
H3O+
HNO3
NO3-

2007-05-01 18:10:12 · 2 answers · asked by Anonymous

x-(square root of) 9-3x=0

2007-05-01 18:03:44 · 2 answers · asked by Anonymous

o = theta. Ok the two curves: r = sin2o and r = 1-coso and how do you find all the points (in cartesian coordinates) where the two curves intersect?

2007-05-01 17:50:04 · 1 answers · asked by Robert W 1

Ok the curve, x = t^2 and y = -t ln (t^2) has a loop that begins and ends at x intercepts. Find the area inside this loop.

2007-05-01 17:44:42 · 2 answers · asked by Robert W 1

A sample of 70.5 mg of potassium phosphate is added to 15.0 mL of 0.050M silver nitrate. Calculate the theoretical yield of the precipitate that formed.

2007-05-01 17:35:54 · 1 answers · asked by wqel12 1

Beer Law Plot:
How would I find the molar absorptivity for iron(III)-salicylate complex, 1/M*cm at a wavelength of 530 nm.

Also, I just wanted to make sure I have the slope correct; if I would enter all of my concentrations and absorbance info in the calculator and find the linear regression equation that will give me the slope correct.

2007-05-01 17:21:04 · 1 answers · asked by abc 2

I think it an expression of percentage, but I'm not sure.

If not is there a way to convert it to percentage?

Thanks in advance.

2007-05-01 17:04:14 · 3 answers · asked by DRD 4