Chemistry - March 2007

Why is the boiling point of methylamine -6 degrees celsius and ethane is -89 degrees celsius if they have similar molar masses?

2007-03-25 05:59:48 · 3 answers · asked by glance 3

2007-03-25 05:53:33 · 3 answers · asked by Anonymous

i'm looking for an article to write a 2 paged, doubled-spaced paper on... anyone have a chemistry-related article they've found that they would like to share? something less-advanced in the field would be sweet

2007-03-25 05:50:33 · 1 answers · asked by ? 2

A 10.0-mL sample of 0.75 M CH3CH2COOH is titrated with 0.30 M NaOH. What is the pH of the solution after 22.0 mL of NaOH have been added to the acid? Ka = 1.3 × 10-5
5.75
4.94
4.83
4.02
3.95
plz help me, thanks in advance

2007-03-25 05:49:50 · 3 answers · asked by jennifer 2

how many grams of ZnSO4 can be added to the solution before BaSO4 begins to precipitate ?

2007-03-25 05:45:43 · 1 answers · asked by Teddy JJ 1

Ksp = 1.10 x 10−18

Hg2Cl2(aq) ---> Hg22+ + 2Cl−

2007-03-25 05:43:05 · 1 answers · asked by Teddy JJ 1

1) write the electronic structures of both sodium and fluorine and describe how the atoms combine to fomr sodium floride?

2) name and describe the bonding within and between the molecules in liquid fluorine

2007-03-25 05:33:01 · 2 answers · asked by Anonymous

NaOH(s) + H2O(l)-------> NaOH(aq), this is how i think it should look not sure, basically I have to do a BALANCED chemical equation of sodium hydroxide being added to water and being turned into a solution. So if any of you can help I will be grateful.

2007-03-25 05:30:46 · 1 answers · asked by Anonymous

2007-03-25 05:30:20 · 1 answers · asked by Anonymous

How many grams of BaF2 will dissolve in .480 L of a .110 M NaF solution?

BaF2 -> [Ba] [F]^2

Initial 0 .110
Change x 2x
Eq x .110 +2x

Assume x is negligible.

Ksp= 1.80e-7 = (2x)^2 (.110)

(4x)^2(.110) = 1.80e-7

(1.80e-7) / (.110) = 1.636e-6 4x^2

(1.636e-4) / (4) = 4.09e-7 x^2

x= square root of (4.09e-7)

x= 6.395e-4

MM= 175.324

(175.324) (6.395e-4) = .11211 g/L

(.11211 g/L) (.480 L) = .05381745 g ?

2007-03-25 05:20:29 · 1 answers · asked by Anitec 2

2007-03-25 05:18:46 · 3 answers · asked by surferbabi 4

which of the following molecules shows the smallest number of lone pairs in its lewis structure?
CHO-CHO
C2H6
CO2
CH3Cl

2007-03-25 05:17:23 · 2 answers · asked by Anonymous

If some of the magnesium oxide had escaped from the crucible, would your percentage composition calculation of magnesium be too high or too low? Explain.

2007-03-25 05:05:09 · 1 answers · asked by many men 1

2007-03-25 04:46:31 · 4 answers · asked by Char 1

i apreciate all the help on balanceing it.. but now i need help becuz i have no idea what type of reaction is. im thinking combustion only becuz it reacts with Oxygen. but in not sure cuz theres other factors. it doesnt match up to anything in my notes. please and thank you

2007-03-25 04:45:46 · 7 answers · asked by babs335123 3

2007-03-25 04:45:21 · 1 answers · asked by SWETA 2

I khow lead to change into gold by proceess of transmutation by bombarding with neatrons how do they do so?is there any other element being prodused artifisially..hey!uranium just strucks me is it synthetic.?is it related to holocaust?

2007-03-25 03:56:16 · 4 answers · asked by Anonymous

2007-03-25 03:52:15 · 1 answers · asked by Anonymous

2007-03-25 03:47:59 · 2 answers · asked by shigure 1

2007-03-25 03:44:43 · 2 answers · asked by shigure 1

2007-03-25 03:42:56 · 6 answers · asked by yoyo181993 1

2007-03-25 03:42:48 · 1 answers · asked by shigure 1

2007-03-25 03:38:31 · 2 answers · asked by shigure 1

1. The formula of a complex salt A is [Cu(Nh3)x(H2O)y]SO4 and analysis produced the following composition by mass : Cu - 24.1% , H-6.1% , O-36.4%. Calculate the values of x and y and hence determine the percentage by mass of sulphur in A

2. When 585 mg of the salt UO(C2O4).6H2O was left in a vacuum desiccator for two hours , the mass was reduced to 535 mg. Predict the formula for the resulting substance.

2007-03-25 03:06:41 · 1 answers · asked by Anonymous

Can escape of hydrogen during the reaction between zinc and dilute sulphuric acid be described as being accompanied by effervesence?

2007-03-25 02:49:47 · 4 answers · asked by Boulevard of broken dreams 1

After I found out, I don't call him now.
Or as often.

2007-03-25 02:13:54 · 9 answers · asked by Anonymous

2007-03-25 02:00:54 · 1 answers · asked by mega 2

Absolutely, there are harms of mentos-diet coke on human body? What are those? What is the reaction in body?

2007-03-25 01:44:19 · 6 answers · asked by Sarah 1

a piece of charcoal takes 2 to3 minutes to glow in the air but takes only 15 to 20 seconds to burn completely in pure oxygen .Why?

2007-03-25 01:40:06 · 3 answers · asked by nazati 2

I need help w/ these questions...

-If 10 liters of Nitrogen reacts w/ 4 liters of Hydrogen at te same temperature and pressure - what is the volume of Ammonia produced?

-A sample of helium effuses through a porous container 6.5 times faster than does an unknown gas X. What is the molar mass of the unknown gas?

-At a certain temperature and pressure, chlorine molecules have a velocity of .038 m/s. What is the velocity of sulfur dioxide molecules under the same conditions?


Know Im basically clueless on how to do these, so ANY help would be great

2007-03-25 01:28:24 · 1 answers · asked by Anonymous