Chemistry - September 2007

2007-09-28 04:04:10 · 11 answers · asked by Anonymous

i need 2 know in 1 hr

2007-09-28 03:58:52 · 5 answers · asked by Anonymous

2007-09-27 23:46:19 · 6 answers · asked by Anonymous

2007-09-27 19:29:51 · 3 answers · asked by jkgregory10@sbcglobal.net 1

how can i separate a mixure of salt and another "dust".both disolve in water.so water i do not think its a solution.is there a magnetic solution or something?thank you in advance.

2007-09-27 19:29:33 · 5 answers · asked by XeS D 1

So far I have down a primary alcohol...can a secondary, tertiary, benzyllic, allylic alcohol be drawn??

2007-09-27 19:17:01 · 2 answers · asked by Bounded 3

HBrO4

2007-09-27 18:55:09 · 6 answers · asked by Anonymous

2007-09-27 18:47:21 · 2 answers · asked by LOVE♥ 1

2007-09-27 18:46:39 · 1 answers · asked by LOVE♥ 1

2007-09-27 17:30:19 · 2 answers · asked by nasiruddin59 1

what results from the oxygen atom being at one end of a water molecule at the hydrogen atoms being at the other end?

2007-09-27 17:16:06 · 4 answers · asked by Anonymous

Can an Ion exchange resin remove the Ca and Mg ions from water? Therefore solving the problem of HArd water?

If not, what other processes are implemented to fix hard water problems?

2007-09-27 17:11:59 · 3 answers · asked by nico 2

Can someone explain to me how to determine the significant figures? And how to determine the sig. figs. in addition, subtraction, multiplication, and division. I know that the rule for determining the sig. figs. is different in adding and subtracting than it is for multiplying and dividing, but can someone explain the method please.

Thank You.
=]

2007-09-27 16:43:52 · 2 answers · asked by late.dawns 2

2007-09-27 16:27:43 · 2 answers · asked by Anonymous

4 compounds that you recognize or can determine with the help of your book: list their name, formula, and what the compound was found in.
please help me

2007-09-27 16:11:37 · 1 answers · asked by Anonymous

What is different between element and atom?
what is the different between molecule and compound?
what is phase?
thank you for reading
if you use it with easy words, then you get the best answer but very detailed but short answer to understand

2007-09-27 16:00:34 · 1 answers · asked by Anonymous

when do you use like
Iron (III) hydroxide
what is ionic? is it non metal+ metal
and when do you use like covelent ?
is it non-metal and non metal?
can you give an example for each one?
even if i get this right or wriong, please explain ionic and covelent precisely using simplified words since im not an english native speaker thank you

2007-09-27 15:58:29 · 3 answers · asked by Anonymous

An organic compound contains C, H, N, and O. Combustion of 0.1023 g of the compound in excess oxygen yielded 0.2766 g of CO2 and 0.0991 g of H2O. A sample of 0.4831 g of of the compound was analyzed for nitrogen by the Dumas method. At STP, 27.6 mL of dry N2 was obtained. In a third experiment the density of the compound as a gas was found to be 4.02 g/L at 127°C and 256 torr. What are the empirical formula and the molecular formula of the compound? (Type your answer using the format CO2 for CO2.)

2007-09-27 15:50:55 · 1 answers · asked by Anonymous

My high school has majors and I'm in the Chemistry major and I want to design a T Shirt for us since it's senior year. I've already got the back side (says "CHEM ROCKS" using the periodic table boxes for each letter to pretend that all of them are elements.....) but I need something for the front.
The only one I could think of was "Lets mix fluids/liquids (don't know which one)" and have beakers and flasks mixing stuff on the front, but it might be too kinky for high school (though last year's Bio-med kids had "Let's play doctor... It's time for your physical...")
So any suggestions?

2007-09-27 15:50:27 · 4 answers · asked by meep meep 7

http://answers.yahoo.com/question/index;_ylt=AmiYRy2Dgy6M6nfomcULxrfsy6IX;_ylv=3?qid=20070927172751AAxLeBd

2007-09-27 15:48:38 · 1 answers · asked by Memories of Another World. 6

Which fatty acids are solid at room temperature? Which ones are liquid? PLease help!

2007-09-27 15:45:46 · 2 answers · asked by leah 1

when finding a melting point, why is it necessary to raise the temperature very slowly when approaching the meltng temperature?

2007-09-27 15:42:54 · 2 answers · asked by Anonymous

Whats the difference between a hydrolysis reaction and a synthesis reaction? PLease help!

2007-09-27 15:41:32 · 2 answers · asked by linda 2

2007-09-27 15:39:36 · 3 answers · asked by Anonymous

We have a review page for chemistry and it's got conversion problems on it, like 0.75kg to milligrams. I know how to do them by simply moving the decimal, but I checked my first answer and I think we have to do it mathematically. If I do it by just moving the decimal, don't I still get the same answer?? I am SO confused!!
......Ok. for 0.75 kilograms to milligrams, I moved the decimal to make it correct (I think). I have .00000075 but the answer says it should be 7.5x10^5 which means moving the decimal the OTHER way, I thought! So that would be 750,000. But it just doesn't make any sense!

Here's what she wrote:
.75kg x (10^6mg/1kg) = mg

Obviously, chemistry isn't one of my strengths...
If you can help, I would really appreciate it!!! :( I have a test tomorrow and I really don't want to fail.

Thanks.

2007-09-27 15:35:52 · 2 answers · asked by ? 2

2007-09-27 15:35:33 · 3 answers · asked by jorgevides1 1

How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

2007-09-27 15:34:33 · 1 answers · asked by Giulio M 5

A piece of copper alloy with a mass of 86.0g is heated from 30.0c to 47.5c. During this process, it absorbs 521J of energy as heat?

What is the spefic heat of this copper alloy in J/g-K?
How much energy will the same sample lose if it is cooled to 24c (in J)?

2007-09-27 15:32:36 · 1 answers · asked by Anonymous

ok well i get like 70 pts of extra credit if i find an ansewer to this so here i go...what would 2 liquids do if they have the same density but arnt soluable..........which one would go on top of each other or what i need to know

2007-09-27 15:28:56 · 3 answers · asked by mwoodruff052893 1

Hg2 2+ and PO4 3-

2007-09-27 15:28:26 · 1 answers · asked by Anonymous