Chemistry - January 2007

Ok, please help me determine the oxidation #s for :
(also, include how you got your answer please)

NaOH

and

Na4 As O4
I assigned the following oxidations #s to the one above:
Na---> +1
As---> +4
O4---> -2
Please tell me if I'm correct.

2007-01-21 12:13:26 · 1 answers · asked by A 2

2007-01-21 12:13:07 · 3 answers · asked by sweetandlow16530 1

does anyone know a labratory setup that can be used to collect CO2 over water? The CO2 will be made using two solutions (Na2CO3) and (H2SO4). links would be great with pictures or a detailed explanation

2007-01-21 12:03:10 · 1 answers · asked by Anonymous

As the elements in Group 17 are considered in order of increasing atomic number, the chemical reactivity of each successive element decreases, increases or remains the same?

2007-01-21 11:59:21 · 4 answers · asked by Dom 2

2007-01-21 11:53:38 · 4 answers · asked by Adriana 5

2007-01-21 11:47:01 · 4 answers · asked by Rimi M 1

just curious....is H2 considered an element? i know it's a diatomic element, but is it also an element in general?

2007-01-21 11:24:36 · 7 answers · asked by runnr.grl 2

A compound of P and S contains 27.87% P and 72.13% S. The molar mass of the compound is 223.3 g/mol. Calculate its molecular formula.

2007-01-21 11:09:05 · 2 answers · asked by Joann 2

2007-01-21 11:06:43 · 7 answers · asked by Rimi M 1

8 Fe + S8 ==> 8 FeS
what mass of iron is needed to react with 16.0 grams of sulfur?

how many grams of FeS are produced?
please help i am having a lot of trouble with these equations

2007-01-21 11:03:25 · 7 answers · asked by J.r. 3

(Alka-Seltzer)

2007-01-21 10:59:31 · 6 answers · asked by fwc95 1

buirng - means that the substance combines with oxygen.

2007-01-21 10:58:59 · 5 answers · asked by xoxsoccerloverxox 1

2007-01-21 10:48:12 · 2 answers · asked by rockbuilders 1

2007-01-21 10:41:01 · 4 answers · asked by Rimi M 1

any articles that u can find for me would be very heplful. thank you

2007-01-21 10:39:22 · 2 answers · asked by Ashley C 1

2007-01-21 10:22:52 · 3 answers · asked by Daniel w 2

21)equation: 2C2H2 (g) + 5O2 (g) >>>4CO2 (g) + 2H2O (g)
A)how many grams of CO2 & grams of H2O r produced when 52.0g C2H2 burns?
B)how many grams of oxygn is required to burn 52.0 gC2H2
C) use answers form A&B & show how this obeys the law of conservation.
22) Eq: Sn (s) + 2HF (g) >>> SnF2 (g) >>> SnF2 (s) + H2 (g)
A)how many liters of HF are needed ot make 9.40 L h2 @ STP?
B)How many molecules of H2 are maked by the reaction of tin w/20.0L HF @ STP?
C) how many grams of SnF2 can be made by reacting
7.42 X 10 (lil 24) molecules of HF w/Tin?

2007-01-21 10:08:48 · 1 answers · asked by truckin_90 2

Okey - I need to calculate the equilibrium constant for a reaction with the following data: dH0 = -908kJ, dS0 = 181J/K, dG0 = -961.9kJ. Any takers? dG0 is at 298K and changes to 1098K. Assume dH and dS are constant over the temp difference. Query 2: Given: H2O(g) + Cl2O(g) 2 HOCl(g) K298 = 0.090, dH0 = 0, dS0 = -20, and J/K dG0 = 5.97 kJ/mol. For Cl2O(g): dG°f = 97.9 kJ/mol dH°f = 80.3 kJ/mol S° = 266.1 J/Kmol. Find the enthalpy of formation for HOCl. Please explain how you do both/either of these! Thanks in advance!

2007-01-21 09:40:55 · 2 answers · asked by emsviper 2

If a gas is compressed from 4L to 1L and the temp. remains constant what happens to the pressure?

2007-01-21 09:39:38 · 7 answers · asked by aaaaa 2

I know the answer is yes i just dont know why....

2007-01-21 09:34:56 · 4 answers · asked by treesap7h 2

What happens to a gas particles when a gas is compressed?

2007-01-21 09:30:15 · 8 answers · asked by aaaaa 2

2OH-+Cr2o7-2=>2CrO4-2+H2O

2007-01-21 09:26:42 · 1 answers · asked by S 3

2007-01-21 09:25:06 · 4 answers · asked by Victor H 1

1)What is volume at standar pressure(STP), original v=10.0 L at a pressure of 500. mmhg


2)Gas occupies V=457.7 ml at 0 degrees C, what will volume be at 28 degrees C


3) Pressure is 4.50 atm at 20 degrees C. Pressure increases to 4.8 atm. What is the temperature in celcius.


4) Gas measures 1.75 L at -23 degrees celcius and 1.50 KPA. What temperature will gass occupy when V=1.30L at 2.10 KPA


5) V= 350 ml at 27 degrees C. 810 mmhg. What is volume at -3.00 degrees C and 650. mmhg.


6) What volume will .500 moles of 02 occupy at 25 degrees celcius and .520 atm?


7) Cylinder has 25,000 ml of He at 22 degrees C and 5.60 atm. How many grams of He are in the cylinder?


8) Sn + Hf---> SnF2 + H2 How many Liters of HF are needed to produce 14.2g of H2 (assume STP)3


9) At 17.5 degrees C and 740 mmhg, 11.5 g of Na reacts with H20. How many liters of H2 are produced. (Change water to H0H)
Thanks sooo much!!

2007-01-21 09:24:00 · 1 answers · asked by not857 1

2007-01-21 09:22:07 · 1 answers · asked by Anonymous

what is Na2SO4??? english chemistry...?? help please.. Well I need to name the fowwlowing compounds.. how do I do this..

Na2SO4
NaNo3
MG(NO3)2
KCLo4

please help

2007-01-21 09:17:18 · 7 answers · asked by MJ" 2

2007-01-21 09:15:40 · 5 answers · asked by Anonymous

Cr2O7(valence of -2)(aq)+H2O(l)<->2CrO4(valence of -2)(aq)+2H
Cr2O7 is orange and CrO4 is yellow

2007-01-21 09:00:30 · 2 answers · asked by S 3

Cr2O7(valence of -2)(aq)+H2O(l)<->2CrO4(valence of -2)(aq)+2H
orange yellow

2007-01-21 08:58:58 · 1 answers · asked by S 3

why is it that we only start to form memories when we reach the age of about 3 +? why dont we have memories of when we are babies?

2007-01-21 08:57:54 · 10 answers · asked by darkmatter 1