Chemistry - February 2007

I would very much appreciate everyone who atleast attempted my questions....

2007-02-27 14:43:42 · 3 answers · asked by Sk8r Chick 1

If .00625 mols of HCl are mixed with .00255 mols of Ba(OH)2, what is the pH of the resulting solution?

2007-02-27 14:30:34 · 2 answers · asked by Anonymous

1. how is food calorie different from the calorie we use in chemistry?

2. when calculating energy channges for substances other than water, how do we account for the different in their abilities to absorb or release heat?

-thanks

2007-02-27 14:24:01 · 4 answers · asked by helllooooo 2

2007-02-27 14:21:18 · 3 answers · asked by bunny 1

I dont want solutions I just would like to know the chemistry behind it! Please help! Need answer

2007-02-27 14:09:22 · 3 answers · asked by asubound07 2

Physics is the study of everydays technology and geometric and physilophy and science and the mathamatical ways in physics and chemistry and the use of chemicals and biochemic and biochemistry and using Po and chl and ph. and xy23*44dy=what like psh and oxy and h2o ch2ol4 and deophysics

2007-02-27 13:59:39 · 1 answers · asked by nadine d 2

2007-02-27 13:54:41 · 6 answers · asked by Robbie D 1

2007-02-27 13:48:37 · 4 answers · asked by moonbaby29_us 1

?

2007-02-27 13:45:20 · 1 answers · asked by whiterapper 1

does anyone know where i can get good info? ive already seen some videos i just want good info for a paper

2007-02-27 13:44:32 · 1 answers · asked by Anonymous

Chem Question- Please Help?
1. A 5.000g sample that contained NaCl & CuSO4 · 5H2O was heated. After heating, the sample had a weight of 4.688 g. What is the % NaCl in the sample?

2. What is the % Water in the Following?
(a). Nickel (II) Sulfate Heptahydrate [NiO4S · 7H2O]
(b). Sodium Carbonate Decahydrate [Na2CO3·10H2O]

*The Formula for theoretical % H2O= Mass # of Waters in Formula unit/ Formula mass of compound x 100

3. What type of Chemical reaction takes place when zinc metal is added to a solution of hydrochloric acid?
(a) combination reaction
(b) decomposition reaction
(c) single replacement reaction
(d) double replacement reaction
-----
1- ?
2. I think 30.0 goes at the top but idk what the formula mass is...
3- Is it a Single replacement reaction?
..........
*Please check what I have and Explain these to me. I would really appreciate the help. Thank you so Much! = )

2007-02-27 13:43:21 · 1 answers · asked by Miss*Curious 5

What is the line or Lewis structure for the perchlorate ion? I have seen it w/ three double oxygen bonds and one single oxygen bond around the chlorine, four single oxygen bonds, and one that actually DETACHES the oxygen ion and separates it as an octet. Just google the perchlorate ion, and u will get the result in I think the 2nd or 3rd page. What are these all, resonance structures? They seem really weird to me.

2007-02-27 13:17:52 · 1 answers · asked by J Z 4

I've wondered for my chemistry class how does bubble gum pop?

2007-02-27 13:12:06 · 3 answers · asked by airfrogyto19 2

2007-02-27 13:11:10 · 2 answers · asked by watercurves 6

Is NI3 (3=subscript) a covalent or ionic bond. I think it might be covalent im not sure, though. help please. thnxs. <3

2007-02-27 12:59:49 · 5 answers · asked by Jasmine 1

I work at a company that handles large quanties of salt. We are unable to go a long period of time with one machine because the salt rust everything that is metal (steel). Is there a chemical that can be sprayed to prevent the rust or one that can be used to clean the salt regualrly? Any suggestions?

2007-02-27 12:57:23 · 2 answers · asked by Anonymous

I know how to convert grams to moles when using the same substance. However, an assignment in my chemistry packet wants to know how many moles of a substance I must have to produce a certain amount of grams of another substance.

The problem asks: How many moles of nitromethane are needed to form 500.0 grams of chloropicrin, CCl3NO2, a chemical used in the production of pesticides?

CH3NO2 (l) + 3 Cl2 (g) ---> CCl3NO2 (l) + 3 HCl (g).

How would I go about this?

2007-02-27 12:57:18 · 4 answers · asked by Nowhere Man 6

What is the pH of a 5.0 M H3PO4solution?
ka1=7.5 x 10-3
ka2=6.2 x 10-8
ka3=4.8 x 10-13

2007-02-27 12:56:29 · 2 answers · asked by Anonymous

2007-02-27 12:53:43 · 1 answers · asked by Anonymous

a. 1.50 mol Na
b. 6.755 mol Pb
c. 7.02 g Si

PLEASE SHOW WORK!!!

2007-02-27 12:41:50 · 1 answers · asked by Klair 1

2007-02-27 12:41:45 · 2 answers · asked by JaJarvis 1

Does anyone know why heating a solid solute or its solvent increases solubility? If you could explain this to me with some sort of an example too it would be greatly appreciated. Thxs!

2007-02-27 12:31:47 · 2 answers · asked by Pirates of the Caribbean :D 3

If I am writing a scientific essay do I put capitals on elements and compounds (e.g. carbon and ammonium) when they do not start the sentance. e.g. An example of an element is Carbon. Thanks

2007-02-27 12:28:55 · 2 answers · asked by happyforeverguy h 1

fill in the blank

2007-02-27 12:24:43 · 1 answers · asked by kitty 1

I'm trying to find the concentration of all the species present after a 0.10 M solution of oxalic acid is added to water. The problem is that there are two acid dissociation constants, one is 6.5x10^-2 and the other is 6.1x10^-5. Would I use one, the other, or both?

2007-02-27 12:24:02 · 1 answers · asked by www 2

2007-02-27 12:21:08 · 7 answers · asked by Anonymous

we had to use Ca(OH)2 for something. anyway, the next week we looked at the test tube with the Ca(OH)2 and there was a precipitate. why would there be a precipitate? Is it calcium? How would I write an equation to show the forming of the precipitate? thanks.

2007-02-27 12:17:35 · 1 answers · asked by Dan 2

what would it be for S+ and a seperate question is what would it be for MG2+

one par of electron, two lone electrons

two pairs of electrons, two lone electrons

three pairs of electrons

Two pairs of electrons, one lone electron

two pairs of electrons, three lone electrons

three pairs of electrons, one lone electron

one pair of electrons, 3 lone electrons

Two pairs of electrons

one pair of electrons, two lone electrons

one pair of electrons

four pairs of electrons

two magnesium atoms bound by 2 bonds

2007-02-27 12:15:13 · 1 answers · asked by theoneandonly4251 2

2007-02-27 12:06:23 · 1 answers · asked by esrarengizbeauty 1

What's the longest word you can make by connecting the atomic symbols with other atomic symbols. They must be adjacent to one another. Diagonals DO count.

2007-02-27 11:51:49 · 3 answers · asked by Habester 3