Chemistry - January 2007

2 HCOONa + H2SO4 ---> 2 CO + 2 H2O + Na2SO4

A 0.964 gram sample of a mixture of sodium formate and sodium chloride is analyzed by adding sulfuric acid. The equation for the reaction for sodium formate with sulfuric acid is shown above. The carbon monoxide formed measures 242 milliliters when collected over water at 752 torr and 22.0 °C. Calculate the percentage of sodium formate in the original mixture.

2007-01-14 14:50:02 · 1 answers · asked by mitu 2

2007-01-14 14:45:01 · 1 answers · asked by bballgirljv 1

How is this possible and besides cost why could one not create some sort of combustion system using this method?

2007-01-14 14:44:25 · 3 answers · asked by PrettyEskimo 4

-The base has to be edible (please note that I have to taste it first, so nothing like alcohol, asprin, etc.)
-Watery, or can be diluted
-I already have baking soda and tap water
-Lastly, PLEASE nothing like: Calcium Hydroxide, Magesium Hydroxide, etc.

Thanks!

2007-01-14 14:34:41 · 3 answers · asked by shiningsaphy 1

Is halogenated hydrocarbons the same thing as halocarbons?
And what is the nomenclature of halocarbons. Like how do you go about naming them. In detail please ><

2007-01-14 14:33:24 · 3 answers · asked by jayjay 1

2007-01-14 14:21:34 · 2 answers · asked by Anonymous

Radioactive Carbon-14 has a half-life of 5730 years. Suppose a piece of wood has a decay rate of 15 disintegrations per minute. How many years would it take for the rate to decrease to 4 disintegrations per minute.

2007-01-14 14:11:31 · 4 answers · asked by RickySingh2006 2

A science club is wondering if a rat could take more or less time according to the size of the maze. If the maze is big enough, it'll take the rat more time to find the cheese. If the maze is small, it'll take the rat even less time to find the cheese. Is the independent variable the size of the maze? and the dependent variable is it the amount of time it takes the rat to find the cheese?

2007-01-14 14:11:14 · 2 answers · asked by biancaonwenu 2

2007-01-14 14:09:01 · 5 answers · asked by Anonymous

2007-01-14 13:57:55 · 3 answers · asked by Anonymous

2007-01-14 13:50:51 · 9 answers · asked by helmut_57 1

chemistry problem. simple. Is this correct?
make 50ml of solution
from:
25mM of tris
50mM of glucose
10mM of EDTA
____________
should I calculate each one seperately..
.025mol/L * .05L * 121 (MW of tris) = .15 g?
And do the other 2 the same way?
I get the answer in g? and then would i combine it all in one beaker then add water?

2007-01-14 13:45:03 · 1 answers · asked by Vee 5

ok, i have this question... i have to answer, but its like italian to me!! plz here it goes...

sodium salicylate is made from carbon dioxide and sodium phenoxide. identify each of these substances as a reactant or a product...


how do i tell them apart? which one is whitch? plz, this is the first homework i got in this class, and o already feel like i'll fail! :(

2007-01-14 13:37:47 · 8 answers · asked by Anonymous

kindly send me if lab protocol is available

2007-01-14 13:21:50 · 3 answers · asked by bioanalyst 1

what are 3 examples of a phisical change? and 3 examples of a chamical change?

2007-01-14 13:16:57 · 4 answers · asked by Anonymous

And how did you get the answer, Im having a tought time converting mmols to grams.

2007-01-14 13:16:10 · 1 answers · asked by dfgh d 1

1) Which atom on the periodic table is largest? Smallest?

2) Which atom on the periodic table has highest ionization energy? Lowest?

3) Which atom on the periodic table has the highest electronegativity? Lowest?

4) Which subatomic particle(s) in an atom have a mass of 1 amu?

5) Which subatomic particle(s) in an atom have a mass of 1/1837 amu?

Some explanation would be helpful! Thanks!

2007-01-14 13:00:43 · 1 answers · asked by Mitzy D 1

2007-01-14 12:56:52 · 1 answers · asked by Pam 1

?

2007-01-14 12:56:46 · 5 answers · asked by dfgh d 1

2007-01-14 12:51:22 · 3 answers · asked by Anonymous

I have tried copper electrolysis several times using pennys and various batteries (1.5 v to 9 v). Sometimes I get a brownish dark green solution and other times I get a blueish green solution (what I expected). I know I am getting a Copper Chloride, but why the difference in color? The only other ingediants I use is salt.

2007-01-14 12:44:02 · 2 answers · asked by Quimby 3

Here is the question...

A student analyzes a green solution in a spectophotometer and sets the baseline reading to 97.4% (using distilled water) at the wavelength 450nm. He then obtains a 47.3% reading for his green solution at this same wavelength. Determine the absorbance of the solution at this wavelength.

***
I think I'm over thinking this, since I tried to use Beer's Law to solve, but we've never gone over Beer's Law in this class.

2007-01-14 12:31:08 · 1 answers · asked by Anonymous

The molality of lead nitrate in 0.726 M Pb(NO3)2 (density 1.202 g/mL) is ____________________.

Question 1 answers
0.604 m
0.873 m
0.755 m
1.32 m
1.23 m

If you could be explain how you got the answer please

2007-01-14 12:29:00 · 4 answers · asked by Anonymous

which one is sugar and which is powdered sugar.

2007-01-14 12:08:55 · 3 answers · asked by connie 1

2007-01-14 12:04:30 · 2 answers · asked by LaLa 2

2007-01-14 12:02:14 · 10 answers · asked by blacksky515 1

2007-01-14 11:46:33 · 5 answers · asked by Anonymous

When an ice cube cools a drink 3 deg. C, which of the following statements is true?

Kinetic energy of the molecules in the drink decreases.
Evaporation of the water increases.
3 kcal of heat is transferred into the drink.
Molecular collisions in the drink increase.

2007-01-14 11:24:36 · 3 answers · asked by Anonymous

ozone is a poisonous of oxygen that in small concentrations is sometimes used to disinfect drinking water given the following equilibrium constatn explain why the formation of ozone in the air of your classroom not pose a health risk??

3O2 <=> 2O3 K= 1.6 * 10^-56 at 25 degrees

2007-01-14 11:10:19 · 3 answers · asked by peyman_m89 2

This is the question I am having trouble with: Draw a lewis structure for the ionic compound Ba(OH)2.

here is my answer


**

H **O**

x *

Ba x* H


**O**
**

Would the two oxygens be coming off of (or bonded to) the Ba & H to make the noble gas configuration? (8 electrons)
If not, where would the oxygens go? because oxygen only has 6..

any/all answers much appreciated:))

2007-01-14 10:53:34 · 3 answers · asked by kickaburra 1