Chemistry - June 2007

Like, say, two balls of lead? Pb, by the way, has a 2.33 electronegativity which is quite enormous, and it is the heaviest chemically stable element (i.e. the one which owns the biggest amount of electrons). It would then be the most effective element to test electronegativity.

Is that alone enough to make two balls move a bit?

http://en.wikipedia.org/wiki/Electronegativity
http://en.wikipedia.org/wiki/Cavendish_experiment

2007-06-10 02:12:54 · 3 answers · asked by Roy Nicolas 5

Like in PV/T= constant.

http://solospirit.wustl.edu/solospirit2/education/Science%20Side/pvt.html

2007-06-10 01:40:00 · 3 answers · asked by Roy Nicolas 5

Safe methods please!

2007-06-09 23:32:40 · 5 answers · asked by Anonymous

.. general and career wise ...

2007-06-09 21:45:10 · 4 answers · asked by visheshonthenet 2

2007-06-09 21:17:10 · 4 answers · asked by Reeta J 1

Pls. help me!!!!! i need ur answers before Tue.!!!!

2007-06-09 20:30:09 · 6 answers · asked by OTH_fanatic 1

2007-06-09 18:29:55 · 2 answers · asked by cantieloupe 1

hey how can i make a homemade smoke bomb with stuff from like walgreens

2007-06-09 15:57:37 · 4 answers · asked by Anonymous

How many energy is required for the decomposition of 5.0 g of H20 (l) at 1 atm and 25 C into its gaseous elements, given the following reaction:

H2(g) + 1/2 O2 (g) ----> H20 (l) enthalpy = -286 KJ


THANK u... please show the working as well...

2007-06-09 15:32:12 · 1 answers · asked by NG Yut Sei 1

I`m just curious

2007-06-09 14:03:26 · 3 answers · asked by Foxhound 2

Any other combinations like baking soda and vinegar that either make things pop a bit or have a slight firecracker-like effect? I've heard something about sugar and aluminum foil.

2007-06-09 11:52:10 · 2 answers · asked by vintagex50s 2

The equation relating approximate barometric pressure (P, in torr) to altitude(h, in m) is at room T:

lnP = 6.63-(h8000)

Diethyl ether, CH3CH2OCH2CH3, a common organic solvent has a normal boiling point at 34.6 degrees C (and thus vapor pressure of 760 torr at 34.6 C). at 20 degrees C, it has a vapor pressure of 440 torr. At what approximate altitude will diethyl ether boil at 20 C? Where on the earth would it be a problem to keep this solvent liquid?

2007-06-09 11:51:31 · 1 answers · asked by aznxbabi88 2

2007-06-09 09:08:29 · 4 answers · asked by Mince 1

2007-06-09 08:57:11 · 1 answers · asked by theweirdguy1 2

"In car batteries, 6.0 M sulfuric acid is used. If you purchase 18.0 M sulfuric acid, how could you dilute the concentrated acid to get the right molarity if you needed 2.0 liter of the 6.0 M battery acid?"

The calculation:
(2 liters) x (6.0M / 18.0M) = 0.67 L of 6.0M sulfuric acid.

So,
You add 0.67 L of 18.0M sulfuric acid into a flask, add water until the solution is 2L.


Okay, my problem is that I don't understand the calculation. Where does the "(6.0 M / 18.0 M)" come from / what is the reasoning behind everything?

Thanks in advance!

2007-06-09 08:00:43 · 5 answers · asked by Paul 3

This system is at equilibrium. Which of these (only one) will happen if the pressure of the system is lowered?

N2O4(g) ↔ 2NO2(g)


1) N2O4 gas forms.
2) Equilibrium is unaffected.
3) NO2 gas is consumed.
4) NO2 gas is produced.

2007-06-09 07:58:44 · 6 answers · asked by W 1

hope someone can help.

Thanks

2007-06-09 07:56:43 · 3 answers · asked by Anonymous

I know the mmols, density, and molecular weight of the compound.

2007-06-09 07:55:06 · 4 answers · asked by Jane 1

If the partial pressure of N2 is 300 torr and the partial pressure of He is 600 torr, what is the mole % of N2 in the mixture?

2007-06-09 07:47:06 · 3 answers · asked by janeeyre444 1

How many L of NH3 gas forms from 20g N2 if the reaction is done at 740 torr and 20C?

2007-06-09 07:45:56 · 1 answers · asked by janeeyre444 1

Please help me with these science questions i've posted.

Can some please try help me, it's really important. I need answers fast.

thanks so much

2007-06-09 07:37:42 · 1 answers · asked by Anonymous

2007-06-09 07:15:19 · 4 answers · asked by chemistryishard 2

2007-06-09 06:44:00 · 4 answers · asked by Amanda 2

2007-06-09 06:18:45 · 5 answers · asked by parikh 1

I want to test the pewter I used in my home for lead content.

2007-06-09 06:18:26 · 2 answers · asked by C A 1

You can see the material at this link:
http://chemdb.ics.uci.edu/CHEM/Web/cgibin/reaction/PrinterFriendlySynthesisProblem.py?PrinterFriendlySynthesisProblem=Prepare&reaction_category_id=4%2C2%2C12&startingMaterials=Cc1ccc%28cc1%29C%2C%5BC-%5D%23N.%5BNa%2B%5D&productSmiles=Cc1ccc%2528cc1%2529CC%2528%253DO%2529O&cautionNotes=

2007-06-09 06:00:33 · 1 answers · asked by LP 1

Another electron has the set n=3, l=1, ml= 1, and ms=+1/2.
(a) Could the electrons be in the same atom? Explain.
(b) Could they be in the same orbital? Explain.

2007-06-09 05:31:00 · 4 answers · asked by Anonymous

2007-06-09 05:28:42 · 6 answers · asked by Anonymous

(A) Each electron in a nitrogen atom
(B) The valence electron in a sodium atom.
(C) A 3d electron in a nickel atom.

2007-06-09 05:23:58 · 1 answers · asked by Anonymous

2007-06-09 05:10:11 · 1 answers · asked by venkatmurty 1