Chemistry - July 2006

caf2---->ca2+ + 2F-
at aout pH 3.18 water, F- exist HF and F- in the ratio 1:1 coz pH=pka

Ksp= [ca2+][F-]^2
[Ca2+]=x

Can the equation be Ksp=(x)(x/2)^2 right??
i can't understand why [F-] is x/2 in that part.

2006-07-26 06:34:06 · 5 answers · asked by ym 1

2006-07-26 06:33:20 · 7 answers · asked by ? 2

Given that 9.09e20 molecules of XeFn weigh 0.311g, calculate n.

2006-07-26 06:27:40 · 1 answers · asked by melomane 4

opted PCM.

2006-07-26 05:07:52 · 5 answers · asked by chinky 2

what is the glaze recipe for low fired glaze of about 800 degree centigrade firing with electric kiln and exclusion of custer felspar but inclusion of potash,kaoline,glass flint,red oxide,borax. what will be the percentages of each materials to get brow-red or ox blood red but must be transparent and glossy and must be able to melt at 700 to 800 degree centigrade at most 900 to 1000 degree centigrade.

what will be the mesh size and i would not want the glaze to run.

Thanks and God bless

Jeff

2006-07-26 03:43:11 · 1 answers · asked by Ezeh J 1

If you answered 1 or 2 question(s), take 2 points.
If you answered the 3: If I can, I'll select the answer fullest of information , and mot understood by me as a best answer.


1-Is Cl2 (2 is down) van der waals, or is it covalent bond?

*2- Web sites for reading physics from primary till UK A'level please:

*3-Web sites for reading Chemistry beyond UK A'level:

*If you don't want to help me, write the sites for yourself! you may need an answer one day!!!

2006-07-26 03:37:53 · 11 answers · asked by Palestini Detective 4

903.3 nanometers to micrometers

2006-07-26 03:31:40 · 5 answers · asked by spongy 2

2006-07-26 03:16:06 · 14 answers · asked by hamid 1

2006-07-26 03:13:10 · 3 answers · asked by muks2k6 1

I am aware that it is in the urine for about 7 days after use...

2006-07-26 03:05:26 · 10 answers · asked by jsartor8869 1

more about membrane tech related to polymer field .. types and applications of polymer membranes

2006-07-26 03:04:42 · 2 answers · asked by divya 1

as i was reading the chem textbooks,they admitted that some of the impt rnxs can't be proved.And that there a lots of exceptions.so i figured why bother earning something that is hypothetical and changed my major.

And the periodic table isn't complete!

2006-07-26 02:26:19 · 12 answers · asked by momma 2

which would be better for a 21 year old girl to have just in case

2006-07-26 02:07:47 · 6 answers · asked by Anonymous

2006-07-26 01:35:45 · 4 answers · asked by allie 1

2006-07-26 01:21:55 · 7 answers · asked by Mr.kissyourasscrack 1

advance tanx You......

2006-07-26 01:04:19 · 4 answers · asked by karlzrakizta_10 1

2006-07-25 23:41:41 · 2 answers · asked by Anonymous

For a Chemistry assignment (year 12).... What is the significance of Argon gas to humans ??? Any info and websites will be welcome !

2006-07-25 23:35:46 · 13 answers · asked by Rika 4

2006-07-25 23:06:50 · 7 answers · asked by Raju.K.M 5

2006-07-25 22:58:11 · 3 answers · asked by Anonymous

2006-07-25 22:41:33 · 13 answers · asked by maqchem 1

I've visited a jeans forum, hoping for enlightenment about care instructions on my >indigo dry denim jeans<, as well as how to fade them according to my petite built.
To my horror, the people there insisted that dry jeans SHOULD NOT be washed for the first SIX MONTHS, just wear them to get a great faded look.. they said.
so, what goes on in the washer which prevents me from getting that same faded look I outta get even if i did not wash my dry jeans? sure there will be bleeding, but i just don't see the before-after difference.

2006-07-25 21:47:14 · 3 answers · asked by potatoboyy 1

Chemistry as a subject

2006-07-25 21:35:49 · 5 answers · asked by Sola B 1

2006-07-25 21:29:08 · 2 answers · asked by marky_boy_1230 2

2006-07-25 19:06:52 · 5 answers · asked by Anonymous

If this is true then how do I take my aluminums temperature without fear of breaking the themometer and get mercury all over it?

2006-07-25 17:24:28 · 5 answers · asked by Anonymous

2006-07-25 15:35:55 · 8 answers · asked by ruun2000 1

Im trying to start use Alchemy i need help starting

2006-07-25 14:52:59 · 10 answers · asked by Anonymous

2006-07-25 14:27:01 · 6 answers · asked by shanita r 1

I want to know exactly what species are present in an acid base titration, EXACTLY at the equivlance point.

Throw a little "why" in there and I will give you best answer. THanks

2006-07-25 13:33:15 · 4 answers · asked by Anonymous