Chemistry - March 2007

in my biology book, it says "the atomic number of carbon is 6, so free atomic carbon has two electrons in its outer shell. therefore, carbon almost almost always forms four bonds"
i thought carbon should has 4 e- in its outer shell, and why it has 4 bonds?

2007-03-25 09:38:56 · 2 answers · asked by Es'er fO LifE 1

finish the question and give your own answer

2007-03-25 09:36:03 · 3 answers · asked by Sam Y 3

2007-03-25 09:30:58 · 18 answers · asked by RACHEL D 1

2007-03-25 09:30:41 · 3 answers · asked by niharika b 1

2007-03-25 09:27:30 · 4 answers · asked by kelxcore09 1

Calculate ΔG (in kJ) at 298 K for some solid ZnF2, 0.088 M Zn2+ and 0.080 M F-(aq)

2007-03-25 09:27:29 · 1 answers · asked by lkatch 2

can anyone solve and explain the steps for:

the molar heat of fusion for water is 6.009 kJ/mol. How much energy would be required to melt 12.75 mol of ice?

2007-03-25 09:25:35 · 3 answers · asked by beentherestillthere 2

why is there a minus sign in the definition of pH ?

is a chemistry question that i am havin trouble with

ithink its because pH is the negative log of H+

2007-03-25 09:14:32 · 3 answers · asked by That's what 'I' said 2

guys, is HI a polar molecule or non polar? why?
and the bond between H and I is it polar? Why?

thank you

2007-03-25 09:14:05 · 1 answers · asked by Jose H 1

sp is in subscript, k is the equil constant.. How do you calculate it from molarities? thanks

2007-03-25 09:12:28 · 1 answers · asked by The Ghetto David Hume 3

How would you calculate the pH of a 1.377 M CH3NH3+ solution? Kb=0.00036

well, i calculated the pOH, since CH3NH3+ + OH- --> CH3NH3OH, [OH-] = 1.377 M as well,
putting that in -log[OH-] gives me -0.1389 as pOH....
what would be the pH of this?!?!?

2007-03-25 09:10:14 · 2 answers · asked by Anonymous

given the mol of everything, liters of container, and the t. i know the formula to get k(c) to k(p), i think that's something different? i dunno, I'm not good at equilibriums thanks.

2007-03-25 09:07:29 · 1 answers · asked by The Ghetto David Hume 3

I collected hyrdogen gas in one tube and an equal volume of carbon dioxide gas in the same type of tube at the same pressure and temperature. Which tube has the greater number of moles? Could you also tell me which one has the greater number of molecules and atoms?
Thanks.
Please help.

2007-03-25 09:05:49 · 1 answers · asked by dcascout 1

2007-03-25 09:02:59 · 10 answers · asked by rdiytfkutygl 1

2007-03-25 08:54:39 · 1 answers · asked by Iryna 2

2007-03-25 08:45:25 · 1 answers · asked by Lina 1

Ok, so i did this equilibrium problem, but the answer doesnt seem right!

If a given weak acid HX has a Ka = 8.3x10^-3. what is the H+ concentration of a solution of HX that has a concentration of 0.0057 mol/L?
*what is that pH of the solution of HX?
*what is the percent ionization of HX?

So i did the first part out, and i got 0.0068 M [H+]
which doesnt make sense because it is bigger than the original concetnration of HX?
is there a mistake in the problem?
and then when i get to the % ionization, it would be 0.0068/0.0057 and then the answer is like 102%!!
Its a weak acid???
is this problem wack??

2007-03-25 08:37:12 · 1 answers · asked by Sparkle 3

2007-03-25 08:33:17 · 2 answers · asked by D 1

what's the best way to make the diet coke as high as possible?
special techniques?

2007-03-25 08:24:47 · 4 answers · asked by Cardinals fan 2

NH3 & Na2S both added to CuSO4 half rxn. with smaller molarity. Does that make a difference? The other half rxn. was just CuSO4 with the salt bridge connecting.

2007-03-25 08:18:56 · 1 answers · asked by Anonymous

why different liquids flow at different rates in terms of their intermolecular forces??

can some one explain it please??

2007-03-25 07:56:38 · 1 answers · asked by Oriel B 1

Wouldn't the positive charges repel each other?

2007-03-25 07:30:13 · 3 answers · asked by David 1

Can someone explain the relationship of an element's line spectrum colour and the "electron jumping back and forth energy level"?

2007-03-25 07:22:47 · 2 answers · asked by play_festivity 4

I'm talking about mechanism here. I think a hydride ion from NaBH4 attacks the carbonyl carbon as one of the C=O bonds becomes a lone pair on the oxygen, but then what happens? Does the oxygen's lone pair attack the hydroxyl hydrogen from the MeOH or is it a hydrogen from NaBH4?

2007-03-25 07:14:57 · 3 answers · asked by Anonymous

The question is at what pressure must a sample of carbon dioxide be confined in a 3.75L flask at 30degC if its volume at STP(standard conditions of temp and press) is 10.0L? The book only shows practice solutions for determining volume but not pressure. Can someone help me setup the equation so i can learn to solve for pressure?

2007-03-25 07:13:48 · 4 answers · asked by Toothie 2

Somebody explain to me a chemical reaction?

2007-03-25 06:58:51 · 4 answers · asked by lawrence_deleeuw 1

2007-03-25 06:49:13 · 2 answers · asked by Anonymous

Balancing Chemical Equations.

2007-03-25 06:12:00 · 2 answers · asked by K Dub 1

What would the Lewis diagram look like for methylamine?

2007-03-25 06:05:25 · 2 answers · asked by kira 2

They're stoichiometry problems & I tried figuring it out but I can't seem to get the correct answers.
Problem1 : If 662g of Pb(NO3)2 undergo this reaction, Pb(NO3)2+Na3(PO4)2+Na(NO3),how many grams of Na(NO3) are produced?
2nd problem: If 530g of Ag(NO3) undergo this reaction, Ag(NO3)+feCl3-->AgCl+Fe(NO3)3, how many grams of Fe(NO3)3 are produced?
They have to have also, the conversion factors & be balanced. All help would be appreciated.

2007-03-25 06:03:31 · 3 answers · asked by Spideyluvr 1