Chemistry - October 2006

2006-10-30 11:54:34 · 7 answers · asked by Anonymous

Where can I find (like websites) information on the process of distillation and its uses? Thanks so much!!

2006-10-30 11:46:29 · 2 answers · asked by Kiara 5

2006-10-30 11:40:32 · 3 answers · asked by great country 1

Na + NaNO3 --> Na2O + N2

On the Left Side, there is only ONE Nitrogen and THREE oxygens, right?

2006-10-30 11:30:28 · 3 answers · asked by ortheother 1

2006-10-30 11:27:37 · 2 answers · asked by Rosa H 1

such as glucose, water, NaCl, KOH, ect...
if not, can someone help me how to determine their color??


-----------------
For those who knows these color, can you answer?
H2SO4 (sulfuric acid)
KOH (potassium hydroxide)
AgNO3 (silver (1) nitrate)
Sr(NO3)2 (strontium nitrate)
CH3 COOH (acetate)
NaOH (sodium hydroxide)
HCl (hydrochloric acid)
H2O (water)
NaCl (sodium chloride)
CuSO4 (copper (||) sulfate)
C6H12O6 (glucose)

2006-10-30 11:05:49 · 1 answers · asked by gogogo 3

I have used TLC to separate plant pigments - what other biological compounds can be separated by this method though? Is its main use for the separation of proteins?
My books give information on the method but very little on the uses.

Also, does anyone know if there is any other method of separating pigments. - I don't need lots of detail - just a name so that I can look it up.

Thankyou!

2006-10-30 11:05:21 · 2 answers · asked by jane 62 1

Both NaCl and CaO crystallize in the same lattice structure. Account for the following: The melting point of CaO is 2899°C while that of NaCl is 800°C. Mark all of the following that contribute to this difference in melting points.

Calcium ion has a larger charge than sodium ion.
The ionic radius of chloride ion is larger than an oxide ion.
NaCl has a higher molar mass than does CaO.
Oxide ion has a larger charge than chloride ion.
Calcium ions and sodium ions have similar ionic radii.

i think its the 1st 2nd and 4th but im not sure

2006-10-30 11:02:30 · 0 answers · asked by Anonymous

What is the hybridization of nitrogen in the following molecules?

H3CNC

2006-10-30 11:01:44 · 2 answers · asked by Anonymous

I am not sure how to find the empiracal and molecular formuala for the following problem:

A common acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 19.81 mg of the acid produces 41.88 mg CO(2) and 6.45 mg H(2)O. The molar mass of the acid is 166 g/mol.

2006-10-30 10:48:38 · 1 answers · asked by ink_spell_020 1

I am having a really touch time trying to figure out how do this problem so can somebody please help explain it to me.


If 5.00g magnesium is combined with 10.0g of chlorine, show by calculation which substance is the limiting reactant, and calculate the theoretical yield of magnesium chloride for the reaction.

2006-10-30 10:31:21 · 1 answers · asked by abc 2

a) Looking at a pair of Optical isomers one would see different
types of chemical bonds in each isomer, however these bonds would have similar spatial arrangements


b) Optical isomers can have different chemical properties


c) A coffee cup and its mirror image are identical, they are superimposable


d) The mirror image of your left hand appears the same as your right hand, i.e. not superimposable

NOTE: there can be more than one answer

any help would be greatly appreciated!!! i saw this question in other posts, but there were different answers from all of them, so just curious if anyone else was sure of the answer they had... thanks again! =]

2006-10-30 10:23:58 · 3 answers · asked by nietzsche 1

will oxidation of lead change it's mass, increase or decrease?

2006-10-30 10:05:04 · 3 answers · asked by yeye 1

Stuck on a chem question... any input would be greatly appreciated. Working on the separation of components of a mixture... Thanks!

2006-10-30 09:57:40 · 2 answers · asked by Erin B 1

I mean cheap. Cheap and easy. I am not as conscerned about quantity, just quality, and nothing like a car radiator that will poison me. I know of the dangers of this but i would like to try this out as an expiriment without spending much money or time in the process of creating a still. Thanks for any help!

2006-10-30 09:55:17 · 3 answers · asked by Anonymous

Is it plastic or organic? If so, what specifically?

2006-10-30 09:38:31 · 3 answers · asked by kumo 1

2006-10-30 09:34:43 · 2 answers · asked by henriettaborrough 1

please answer with details!

2006-10-30 09:08:10 · 4 answers · asked by Anonymous

So I had a chem test today and it went really well (I must say that I am pro at the subject). There was one question that confused me, though. What is the difference between a trigonal pyramidal and a tetrahedral molecule? Because I thought they were the same up until the test....Thanks for your help!

2006-10-30 09:04:53 · 6 answers · asked by Anonymous

heat of formation and heat of combustion??
are they the same thing?

2006-10-30 08:59:44 · 4 answers · asked by Anonymous

What are interesting facts about it i have a project due tomorrow (10/31/06) and i need HELP!!!!!!!!

2006-10-30 08:47:19 · 3 answers · asked by lilydoglover95 1

thanks all

2006-10-30 08:30:06 · 5 answers · asked by annieson 1

2006-10-30 08:24:29 · 6 answers · asked by the one and only robertc1985 4

1. what is the formula for potassium oxide ?
2. what is the formula for calcuim phosphate ?
3. what is the formula for aluinum hydroxide ?
4. what is the formula for magnesium iodine ?
5 what is the formula for potassium sulfide ?

if you could answer any of these it would help !

2006-10-30 08:14:53 · 7 answers · asked by annieson 1

Where can I get potassium nitrate for my garden? I only need a little bit... to test it out! I live in Sydney, NSW, Australia... Could any1 tell me a store where I could get it?

Thanks in advance,
john

2006-10-30 07:43:56 · 2 answers · asked by John W 2

Both NaCl and CaO crystallize in the same lattice structure. Account for the following: The melting point of CaO is 2899°C while that of NaCl is 800°C. Mark all of the following that contribute to this difference in melting points.


Calcium ion has a larger charge than sodium ion.
The ionic radius of chloride ion is larger than an oxide ion.
NaCl has a higher molar mass than does CaO.
Oxide ion has a larger charge than chloride ion.
Calcium ions and sodium ions have similar ionic radii.

2006-10-30 07:43:52 · 3 answers · asked by ryan c 1

why scientist shifted oxygen & hydrogen?

2006-10-30 07:33:13 · 6 answers · asked by mjavadi70 1

What is the hybridization of nitrogen in the following molecules?
H3CNH2

HNNH

H3CNC

2006-10-30 07:23:01 · 1 answers · asked by ryan c 1

What is the bond order of Na2?

2006-10-30 07:19:48 · 1 answers · asked by ryan c 1

2006-10-30 07:11:48 · 2 answers · asked by Michelle B 1