Chemistry - October 2007

why is the answer E, plz explain

What is the total number of electrons that can be accommodated in the level corresponding to n = 5?
A.
2
B.
8
C.
18
D.
32
E.
50


**************

and y is the answer E, plz explain

The hybridization of the central atom in KrF4O is:
A.
sp
B.
sp2
C.
sp3
D.
dsp3
E.
d2sp3

2007-10-23 09:05:37 · 1 answers · asked by mike m 1

2007-10-23 07:53:24 · 2 answers · asked by bete 1

I am getting C12 H .... which is incorrect. The answer is C8 H8... can someone please show me why?

2007-10-23 07:42:20 · 2 answers · asked by Penmate 1

what does unpaired electron mean

plz explain

2007-10-23 07:20:03 · 3 answers · asked by mike m 1

I have two Denver Instrument pH probes that have formed crystals inside of them. The liquid inside them before it crystalized was a 3M KCl solution (potassium chloride). Can someone please give me some ideas on how to dissolve the KCl inside, these are expensive probes and I'd like to be able to salvage them. Thanks for any help!!! Cheers.

2007-10-23 07:13:58 · 4 answers · asked by Anonymous

A person get's a 100% on his last Organic Chemistry exam, but then he only get a 81% on his Organic Chemistry Laboratory Practical exam. What does this mean? He can learn the material but he doesn't know how to apply it??

2007-10-23 06:35:40 · 4 answers · asked by Anonymous

At constant temperature the pressure on a 3.0 Liter sample of a gas is reduced from 2.0 atm to 1.0 atm. What is the new volume of the gas sample? Any help is appreciated!

2007-10-23 06:29:27 · 2 answers · asked by mellow yellow 2

Each of the following sets of quantum numbers is supposed to specify an orbital. Which of the following sets of quantum numbers contains an error?

A) n = 4, l = 2, ml =0
B) n = 3, l =3 , ml = -2
C) n = 1, l = 0, ml =0
D) n = 3, l = 0, ml =0
E) n = 2, l = 1 , ml = -1

2007-10-23 03:54:48 · 2 answers · asked by Jay H 1

what three elements in school are kept under oil ?

what is the reaction of water and caesium

2007-10-23 01:41:00 · 9 answers · asked by Anonymous

what are the reasons there are different carbon atoms, such as alpha and beta carbons? are there different names for carbons with different no. of bonds?

the alpha carbon is the carbon immediately after the carbon attached to the functional group, and the beta carbon is the one after the alpha carbon.. what abt the one after the beta C?

2007-10-23 01:26:31 · 2 answers · asked by nobodyknowsme™ 5

2007-10-23 01:22:05 · 2 answers · asked by niceymath 1

When bromine water reacts with an alkene and then an alkane, what is the functional group from the alkane and the alkene that reacts with bromine.

2007-10-22 23:47:30 · 1 answers · asked by Anonymous

3.364g of hydrated barium chloride BaCl2 xH20 was dissolved in water and made up to a total volume of 250ml . 10ml of this solution required 46.92ml of 2.530 x 10^-2 M silver nitrate for compelte reaction. Calculate the value of x in the formula of hydrated barium chloride, given the net ionic equation for precipitation below
5Fe + MnO4 + 8H ---> 5Fe + Mn + 4H2O

2007-10-22 18:49:10 · 2 answers · asked by techie08 2

This is for a science fair project, perferably chemicals that can be easily looked up

2007-10-22 18:29:57 · 16 answers · asked by FearMyBroccoli 2

2007-10-22 18:03:37 · 2 answers · asked by Leeler 1

25.0 mL of a solution of .200 M NaIO3 was added to acidified iodide ions, the iodine produced reacted with 20.3 mL of sodium thiosulfate (Na2S2O3). Calculate the concentration of sodium thiosulfate solution given the redoc equation:
IO3 + 5I + H -----> 3I2 + 3H20
I2 + 2S2O3 ------> 2I + S4O6


Thanks!

2007-10-22 17:57:05 · 3 answers · asked by techie08 2

, my mass percent of ammonia + copper + sulfate is greater than 100%, that means no water in the complex, WHY IS THAT AND HOW IS THAT POSSIBLE?????

2007-10-22 17:35:24 · 1 answers · asked by Anonymous

Can someone please help me with these?
(Nuclear equations)
1)Alpha decay of polonium-210 (210-top left && 84-bottom left --Po)
2)Beta decay tritium (3-top left && 1-bottom left -- H)
3)Alpha decay of thorium-230 (230-top left && 90-bottom left -- Th)

Any help will be greatly appreciated, thank you!! (:

2007-10-22 16:54:43 · 1 answers · asked by Ami 2

2007-10-22 16:50:44 · 1 answers · asked by Anonymous

2007-10-22 16:46:27 · 2 answers · asked by royce 1

which of these hydrates ( CuSO4, CdCl2, CaCl2) will have a vapor pressure of water:

A) Greater than the partial vapor pressure of water in the atmosphere at room temperature? Explain.

B) Less than the partial vapor pressure of water in the atmosphere at room temperature? Explain.

2007-10-22 16:28:47 · 1 answers · asked by NEEDs MATH HELP!! 1

2007-10-22 16:18:14 · 1 answers · asked by Kara S 1

whats the mass percentage of water in sodium carbonate decahydrate

2007-10-22 15:49:53 · 3 answers · asked by Janie 2

Can energy be released when matter changes> Can it be absorbed> Can a change in matter take place in which energy is neighter released nor absorbed?

2007-10-22 15:47:21 · 2 answers · asked by Anonymous

KOH + BaCl2 -------------> BaOH2 + KCl

2007-10-22 15:45:29 · 5 answers · asked by HAPPY <3 2

2007-10-22 15:41:47 · 2 answers · asked by Ashley F 1

2007-10-22 15:40:13 · 1 answers · asked by Anonymous

I have two isotopes one Cl-37 and Cl-35 atomic unt is 35.45

and one part in the equation there (1-x) how do i get that ?

2007-10-22 15:28:38 · 3 answers · asked by Anonymous

2007-10-22 15:07:34 · 2 answers · asked by Rose R 1

This is an experiment question..
suppose the water for the pan is not saturated with CO2. Will the reported percent CaCO3 in the original sample be too high, too low or unaffected...explain.....thanks

I say to low but im not sure

2007-10-22 14:58:00 · 1 answers · asked by bocabrunette714 1