Chemistry - June 2007

How do u prove tat ur crystals r pure after re-crystallization ( do not contain NaCL)?

2007-06-04 04:08:07 · 3 answers · asked by Anonymous

2007-06-04 03:59:39 · 2 answers · asked by vegasgermain 1

ammonia with nitric acid..
oh and pls be simple, and maybe explin a little bit.. thnks

2007-06-04 03:36:03 · 7 answers · asked by Anonymous

can any1 tel me more about
1.definition about Industrial Waste(IW)
2.Sourses of IW
3.type of pollution
4effetct of improper disposal
5.method of controling improper disposal
6.or do u hav any web to suggest for imfo regarding IW?

i hav search it on9 for quite a long time, but didnt get any useful info. so hope dat , u guys out dere can lend me a hand.

2007-06-04 03:06:50 · 1 answers · asked by c 3

give samples of each property

2007-06-04 01:59:33 · 4 answers · asked by chopin 2

Explain with examples

2007-06-04 00:37:13 · 8 answers · asked by Maya 1

2007-06-04 00:27:35 · 1 answers · asked by radhakrishnan s 1

Show solution

2007-06-03 23:51:38 · 5 answers · asked by Anonymous

2007-06-03 21:16:13 · 3 answers · asked by sandy 1

when trying determine the net ionic eq. of:
Fe(OH)3 + HNO(aq)---> Fe(NO3)3 + H2O?

2007-06-03 19:30:25 · 2 answers · asked by Life Dynamics 2

tup (1) 1mL of water placed on top of the mercury,(2) 1mL of suger placed on top of the mercury,(3) and 1mL of NaCl placed on top of the mercury, which one is higher and the lower??

2007-06-03 17:50:06 · 1 answers · asked by mazzzen_mazzzen 1

2007-06-03 17:47:08 · 4 answers · asked by Pocky 1

Calculate moleculer formulas of the compounds having the following empirical formulas and molar masses: C2H8, 58 g/mol;CH, 78 g/mol; HgCl 236.1

and then this one also

Assuming STP and a stoichiometric amount of NH3 and NO in an expandable container originally at 15 L, what is the final volume if the reaction goes to completion? 4NH-3+6NO --> 5N-2 + 6H-2O

2007-06-03 15:52:08 · 2 answers · asked by shepey11 2

i know that for dilute acid such as HCl, you write as H+ and Cl- and after that just delete the spectator ions. but is that the same for concentrated HCl/H2SO4/HNO3 ?

2007-06-03 15:52:06 · 1 answers · asked by tRNA 1

2007-06-03 14:01:05 · 1 answers · asked by 1234567890 5

2007-06-03 13:43:20 · 3 answers · asked by urallgonnalose54 2

How many grams of silicon tetraflouride, a gas, at room temperature, would fill the same volume as that occupied by 350 grams of carbon monoxide at 75C and 575 torr?

2007-06-03 13:31:18 · 4 answers · asked by herlots 1

2007-06-03 13:24:57 · 2 answers · asked by sabreenjalil@sbcglobal.net 2

2007-06-03 12:17:10 · 4 answers · asked by ampofo a 1

The solubility product for lead chloride (PbCl2) is Ksp=1.2x10^-5 at T=25 degrees Celcious. If solid lead chloride is added to a 0.0200 M solution of sodium chloride (NaCl), a strong electrolyte, what will the concentration of Pb2+ ion solution at equilibrium?

2007-06-03 11:50:33 · 2 answers · asked by Anonymous

2007-06-03 11:27:05 · 4 answers · asked by D K 1

Thank you.

2007-06-03 10:49:53 · 5 answers · asked by T-Rex84 1

2007-06-03 10:38:26 · 1 answers · asked by Yayan 1

1. Fe3+ + SCN1- --------- Fe (SCN)2+

2. Ca2+ + C2O42- ------- CaC2O4

3. Pb2+ + 2 I1- ---------PbI2

4. Ag1+ + Cl1- ------- AgCl

5. Ba2+ + SO42- ------BaSO4


Thanks!

2007-06-03 10:35:08 · 2 answers · asked by Yayan 1

An object weighed on an analytic microbalance that has an accuracy of +/- 0.1 mg. The mass of the object is precisely 4 g (infinite precision). To how many decimal places should the mass be written? Explain.

2007-06-03 10:30:27 · 1 answers · asked by aznxbabi88 2

2007-06-03 10:28:00 · 5 answers · asked by Anonymous

does heavy water (2-H2O) taste different from regular water?
is it safe to drink heavy water?

2007-06-03 10:14:34 · 2 answers · asked by Rosy 2

What mass of Al is necessary to produce 1.32 L of H2 at STP in the following reaction? 2 Al + 3 H2SO4 ® Al2(SO4)3 + 3 H2

2007-06-03 10:04:10 · 1 answers · asked by Maddie L 1

A)methananmide

B)propanamide

2007-06-03 09:46:57 · 3 answers · asked by Anonymous

list all reactions that could occur.

2007-06-03 09:46:17 · 1 answers · asked by Gabriel L 1