Chemistry - November 2006

plz help me... plz

2006-11-12 18:32:05 · 1 answers · asked by the cool guy 1

2KClO3(s) → 2KCl(s) + 3O2(g)



What volume (ml) of O2 is collected over water at 22.0 oC by the reaction of 0.274 g of KClO3 if the barometric pressure is 726.2 mm Hg
The vapor pressure of water at 22.0 oC is 19.8 mm Hg.

2006-11-12 18:11:24 · 1 answers · asked by Mononkeneo 1

This is for extracting various alcohols and water from a solution without having to maintain the solution at a very high temperature. I think it might be less energy intensive this way, but I have no data on energy needed to maintain a vaccum. What is the wattage on some of the pumps able to do this? Could it be cost prohibitive compared to just boiling at full temp?

2006-11-12 17:54:39 · 3 answers · asked by Brian L 4

What direction of shift is expected with an endothermic reaction when heat is removed by decreasing the temperatur of the system?
--->
heat + A + B <--- C + D

2006-11-12 16:58:30 · 3 answers · asked by femylatina 1

I know basic chemistry, but help me out with this one. On the Periodic Table of Elements, there are several elements which are artificially produced. An element is the most basic, simple thing. So how can one create a new one working only with existing elements? Also, why are some listed on the Table, though they are noted as "Not Yet Produced". How can they even be on the Table if they don't exist?

2006-11-12 16:16:59 · 4 answers · asked by ? 5

a.) .848 g/L
b.) 1.55 g/L
c.) 1.70 g/L
d.) 1.85 g/L

please show work!

2006-11-12 16:11:00 · 7 answers · asked by Alyssia S 1

2006-11-12 15:29:05 · 6 answers · asked by trinh625 1

How would I calculate the final temperature of a mixture made up initially of 70.0 mL liquid water at 28.0 degrees C and 5.0 g ice at 0.0 degrees C?

You don't have to figure out the problem for me, I'm just trying to figure out what formula to use so I can solve it. Thanks!

2006-11-12 15:10:04 · 3 answers · asked by Nick 2

Equation Sodium Metal is add to water

What speice is being oxidized

what is reducing agent in reaction

with some reaction whhich react faster Potassium or Soduim

2006-11-12 15:09:51 · 2 answers · asked by Jason Z 1

2006-11-12 14:58:26 · 1 answers · asked by Ren 2

plz plz plz plz this is for my major assignment!!!!!!!!!

2006-11-12 14:19:26 · 4 answers · asked by Xrostee 1

2006-11-12 14:09:36 · 5 answers · asked by joshnkim63 1

2006-11-12 14:06:47 · 4 answers · asked by joshnkim63 1

A sample of a mixture containing only sodium chloride (NaCl) and potassium chloride (KCl) has a total mass of 4.000g. When this sample is dissolved in water and excess silver nitrate is added a white precipitate (AgCl) forms. After filtration and drying, this precipitate had a mass of 8.5904g. Calculate the mass percent of each component in the mixture.

2006-11-12 14:06:36 · 1 answers · asked by azncrazygurl520 1

2006-11-12 14:04:15 · 4 answers · asked by joshnkim63 1

Element X forms both a dichloride, XCl2 and a tetrachloride, XCl4. treatment of 10.00 g of XCl2 with excess chlorine forms 12.55g XCl4. Calculate the atomic weight(amu) of X and identify X.

2006-11-12 14:04:01 · 2 answers · asked by azncrazygurl520 1

2006-11-12 14:02:56 · 1 answers · asked by Anonymous

How many types of atoms can you expect to find in a pure sample of any element?

2006-11-12 14:01:04 · 3 answers · asked by J 1

How many atoms are there in one molecule of H3PO4? 8 How many atoms of each element are there in this molecule

2006-11-12 13:58:50 · 1 answers · asked by J 1

2006-11-12 13:56:33 · 5 answers · asked by kimmie082krunk 1

what happens to the size of the associated ions: e.g. Nat --> Mg2+ --> Al3+

2006-11-12 13:49:46 · 3 answers · asked by Tim H 1

2006-11-12 13:47:22 · 3 answers · asked by Anonymous

What happens to the size of the metal ions as you go down group I? Why?

2006-11-12 13:42:53 · 2 answers · asked by Tim H 1

Ca(No3)2 + Na2CO3 --> CaCO3 + NaNO3

2006-11-12 13:41:19 · 3 answers · asked by untilyoucamealong04 3

During the standardization of the NaOH solution,a number of changes were made in the procedure, most of them by mistake. explain what effect, if any, each of the changes would have on the calculated molarity of the NaOH

2006-11-12 13:36:52 · 3 answers · asked by bebop_0632 1

2006-11-12 13:26:16 · 1 answers · asked by Cindy 1

i need help changing 29.6 in/hg into mm/hg.

2006-11-12 13:22:49 · 1 answers · asked by getmywayjay 1

how many liters of HCl gas is produced by a reaction of 18 L of H2 Gas with 18 L of Cl2 gas? (at same temperature and pressure?)

2006-11-12 13:21:48 · 3 answers · asked by Anonymous

2006-11-12 13:13:45 · 4 answers · asked by t-man foshizzle 2

chem question -- i really need help!

2006-11-12 12:56:43 · 4 answers · asked by sarah 2