Chemistry - January 2007

I was wondering how you can tell the difference between polar and nonpolar molecules by looking at the molecular formula....
so i guess im asking, by looking at a molecular formula how can you tell whether the substance is polar..then nonpolar...and i need to list 4 categories with some examples..please help me out:)

2007-01-04 05:59:55 · 5 answers · asked by Anonymous

does this create a white powder?

2007-01-04 05:58:57 · 4 answers · asked by chattdude43 2

first y silver sulphate is soluble in dil nitric acid..
second why silver thiosulphate is soluble in excess thiosulphate
third no ppt is formed when bacl2 reacts with sulphides
fourth why white ppt of baso3 sol in dil hcl on warming with h2o2 the ppt is oxidized to baso4
fifth y baso4 is insoluble in dil hcl
sixth why no ppt formed when thiosulphate reacts with bacl2 except from concentrated solutions...
seventh y red colour of fe2so3 turns reddish brown on boiling?
eight y purple colour of complex ferric thiosulphate fades rapidly and disappears by boiling
ninth decoulirization of iodine occurs when reaction of iodine with sulphide,sulphite,thiosulphate yet -ve with sulphate
tenth same ninth question if reaction with dichromate or permengante

IF NO ONE KNOWS THE ANSWER JUST CAN U TELL ME A WEBSITE...OR IF U HAVE VOGEL'S PRACTICAL CHEMISTRY TEXT BOOK THE ANSWERS R THERE

2007-01-04 05:14:52 · 2 answers · asked by caramella 1

I'm going to find out the information on how to do this properly so that I don't poison myself.

2007-01-04 05:14:03 · 1 answers · asked by lord_andys_new_id 1

e.g / \ /OH
would the OH group be on the 3rd carbon or on the 4th carbon like i have drawn??
if you know what i mean!

2007-01-04 04:42:56 · 5 answers · asked by Anonymous

I have a mixture of Phenyl diChloro Phosphate, Diphenyl chloro phosphate and small quantity of dissolved HCl gas in it. I want to determine its composition by any suitable chemical or Instrumental method.

2007-01-04 04:23:54 · 2 answers · asked by Amit M 1

Explain the following observations:

water evaporates more quickly on a hot dry day, than on a hot humid day

it takes longer to cook hard boiled eggs at high altitudes than at lower altitudes

2007-01-04 03:48:12 · 4 answers · asked by bosox1989 1

Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vapoization of CCl2F2 is 289J/g.

What mass of this substance must evaporate in order to freeze 100g of water initially at 18 degrees C?

Heat of fusion of water is 334 J/g and the specific heat of water is 4.18 J/g-K

2007-01-04 03:45:48 · 2 answers · asked by bosox1989 1

Well, I know what it is. I just don't get why we need it. Why is it an essential need in chemistry?

2007-01-04 03:42:37 · 2 answers · asked by slsampl13 1

2007-01-04 03:37:38 · 1 answers · asked by London S 2

I have asked this question before..I would like to have more answers clear and simple. Thank You

2007-01-04 03:12:06 · 3 answers · asked by Padmini Gopalan 4

2007-01-04 03:02:36 · 4 answers · asked by nagu 1

2007-01-04 02:53:57 · 3 answers · asked by sruthi n 1

what method could i use to experiment the effect of varying the concentrations of oxalic acid and to find the rate equation of the reaction?? plz help

2007-01-04 02:35:39 · 2 answers · asked by Anonymous

2007-01-04 02:34:22 · 2 answers · asked by helpless kid 2

2007-01-04 02:26:56 · 20 answers · asked by koteshwara r 1

no matter how many times i seem to try and get my head around it i get confused because every periodic table i seem to look at is different

2007-01-04 02:13:34 · 13 answers · asked by jess_xx_2001 1

to whom it may concern,
my name is rachel wilson. i am a junior at morgan park high school. i am doing a project on bacterial fermentation scientist and i needed some information about this type of scientist. if you can, will u please send any information on a bacterial fermentation scientist? thank you very much

2007-01-04 02:10:44 · 4 answers · asked by booshnack 1

2007-01-04 02:10:36 · 2 answers · asked by Anonymous

how can chemicals like common alum,boric acid,borax,sodium bicarbonate be identified with the help of simple CHEMICAL TESTS in the laboratory....cud u give the accompanying chemical reactions ?(pls use common lab reagents)

2007-01-04 01:38:00 · 7 answers · asked by Anonymous

Heres the info: Two containers filled with water and both containing an added sodium electrolyte. A pipe connects the two containers which allows free passage of the water and therefore the electrolyte. A negative electrode is applied to the left container and a positive electrode applied to the right container. Why does electrolysis not take place in this setup?

2007-01-04 01:22:05 · 3 answers · asked by Anonymous

on the molecular level, how does a lioquid differ from a gas? How does it differ from a soild?

2007-01-04 01:20:09 · 3 answers · asked by nargis 2

2007-01-04 00:49:06 · 5 answers · asked by meow0911 1

2007-01-03 23:39:00 · 4 answers · asked by neelakantan r 1

1.Carbon reacts with sodium iodide to form sodium bromide and iodne

2. Bromine reacts with sodium iodide to form sodium bromide and iodine

3.PCI3 reacts with chlorine gas to produce PCI5

4.Phosphorus reacts with bromine to produce PBr3

5.CaH2 reacts with water to produce (Ca)OH)2)

6.H2SO4 reacts with potassium hydroxide to produce(k2so4)

7.C3H8 reacts with oxygen gas to produce carbon dioxide and water

8.C6H6 reacts with oxygen gas to produce carbon dioxide and water

write the balanced equation for these reactions.


They totally confused me and got me beat

2007-01-03 23:36:03 · 2 answers · asked by User84 4

2007-01-03 22:27:55 · 14 answers · asked by Arjun M Nair 2

ethanol is the by-product of yeast fermentation from sugars in molasis but is their any advantage for yeast from that apart from our consumtion as a bevarage

2007-01-03 22:14:56 · 6 answers · asked by krish 1

The law of definite composition states that all samples of a compound have the same composition— the same proportions by mass of the constituent elements. Which of the following is a consequence of this law?
A)Reactants are consumed completely and simultaneously in a reaction as dictated by their coefficients in the balanced equation.
B)The reactant that is consumed completely determines the quantities of products that will form.
C)Definite proportion of the elements in a given compound is represented by its chemical formula.
D)All of the above

2007-01-03 21:49:38 · 3 answers · asked by #15mwu 5

What is helium made of? Where does it come from? What are it's properties?

2007-01-03 21:43:35 · 6 answers · asked by Soundguy 2

For example, acetic acid in a solvent.

2007-01-03 21:37:21 · 7 answers · asked by Anonymous