Chemistry - May 2007

2,24x10^-2 dm3 of H2 was evolved (formed) when 24mg of bivalent metall X reacted with an acced of HCl.

correct answer: Mg how?

2007-05-30 02:58:43 · 4 answers · asked by Anonymous

2007-05-30 02:39:11 · 4 answers · asked by Anonymous

2007-05-30 02:30:33 · 8 answers · asked by Budapest1 2

What is the correct formula for an ionic compound that contains aluminum ions and carbonate ions?

a.Al(CO3)2
b.Al2(CO3)3
c.Al3(CO3)2
d.Al(CO3)3
e.AlCO3

2007-05-30 02:20:56 · 5 answers · asked by Anonymous

2007-05-30 02:17:23 · 5 answers · asked by scott c 1

Plz help me.. i have an exam in chemistry next monday and i dont know so much about acids and bases so i need ur help.. plz give me some sites that explain the acids and bases step-by-step... Some sites that explain them from the begining to the end

2007-05-30 01:43:38 · 6 answers · asked by ahmed541991 2

The dissociation constant Ka for the weak acid is equal 10^-5. pH of 0,1M solution of this acid is

a, 2 b 3

b is correct. Why?

2007-05-30 01:43:28 · 2 answers · asked by Anonymous

2007-05-30 01:20:03 · 17 answers · asked by bissel 2

Something along the lines of atoms and properties of metal

2007-05-30 00:44:13 · 3 answers · asked by ERU 2

2007-05-30 00:13:20 · 1 answers · asked by kms 1

2007-05-29 23:29:14 · 2 answers · asked by Anonymous

what would be the name of the ester when
1) 3-methyl-butanol (alkanol) react with ethanoic acid (carboxylic acid)
2) mthanol react with salicylic acid

thank you!!!

2007-05-29 23:07:12 · 4 answers · asked by Labuuu* 1

2007-05-29 22:51:32 · 1 answers · asked by fathiemadabadi 1

plzzz give me the answers for the following questions,,,i cant answer them!!!!help plzzzz


1)formula for Barium Sulphate

2)chemical name for KCN

3)following is a table---
A B C D E F G H
2 3 3 6 9 11 19 23 MASS NOS.
1 1 2 3 4 5 9 11 ATOMIC NOS.

where A,B,C..... all are elements with there respected mass and atomic numbers
Q)--which of the above will form single positively charged ion?
Q)--which of the above will form single negatively charged ion?

2007-05-29 22:00:51 · 2 answers · asked by kitkat 3

I am in +2 and i need help with the following terms: Specific conductance, equivalent conductance and molar conductance.Can somebody explain.

2007-05-29 20:46:33 · 1 answers · asked by meetan 1

2007-05-29 20:44:04 · 1 answers · asked by Anonymous

zinc is colorless when it dissolved in the solvent while when cuprum is added to the solvent, it becomes blue solution.why?

2007-05-29 19:34:31 · 5 answers · asked by budakkampung_ozai 1

1) 0.5 M Na OH NaOH (shifts back and forth) Na+ + OH-
2) 0.7 M N2O4 N2O4 (shifts back and forth) NO2
3) 0.3 M H3PO4 H2O + H3PO4 (shifts back and forth) H3O+ + PO4 3-
I am lost and confused on what to do. Please help me. Thank You.

2007-05-29 19:32:01 · 2 answers · asked by Anonymous

The score curves of the two books are different, so which one is correct?

2007-05-29 19:07:07 · 1 answers · asked by G 2

2007-05-29 17:57:44 · 4 answers · asked by Anonymous

12.
mass of sodium would be produced when 2.3 g of sodium reacts with .56 L of chlorine gas. assume Stp & 100% yield. Calculations and balanced equation required.

49.
The salt produced when magnesium hydroxide reacts with sulfuric acid. Balanced equation, chemical formula, chemical name and common name

50. The amount of NaCl produced from 10.o g of sodium hydrogen carbonate reacting with an excess of hydrochloric acid. assume 75% yield. Balance equation and calculations required

2007-05-29 17:36:59 · 3 answers · asked by Anonymous

2007-05-29 17:30:21 · 1 answers · asked by Anonymous

if humidity levels cause a decrease in air pressure, why does an elevated humidity level slow the solvent evaporation process from paint films? wouldn't the drop in pressure promote a faster evaporation rate?

2007-05-29 17:21:41 · 2 answers · asked by taulmachof 1

Anyone know or have any sources?

2007-05-29 17:09:46 · 2 answers · asked by Anonymous

(a) more complete, and In- is a stronger base
(b) more complete, and In- is a weaker base
(c) less complete, and In- is a stronger base
(d) less complete, and In- is a weaker base

2007-05-29 16:38:26 · 1 answers · asked by Anonymous

2007-05-29 16:36:29 · 1 answers · asked by cabinohio 1

10.0 moles of carbon dioxide in 24 hours period

2007-05-29 16:34:44 · 1 answers · asked by gabby o 1

2007-05-29 16:34:37 · 3 answers · asked by Anonymous

Hi I'm doing some research for smelting copper by using an electric cubicle furnace and have encounter alot of air bubble in the smelted material. Do anyone know how to dissolve the air bubble? Do i need to add any chemical or material before the smelting process? Please Help!

2007-05-29 16:28:15 · 2 answers · asked by Anonymous

Hi I'm doing some research for smelting copper by using an electric cubicle furnace and have encounter alot of air bubble in the smelted material. Do anyone know how to dissolve the air bubble? Do i need to add any chemical or material before the smelting process? Please Help!

2007-05-29 16:27:40 · 2 answers · asked by Anonymous