Chemistry - February 2007

18. The valence of aluminum is +3, and the valence of chlorine is -1. The formula for aluminum chloride is correctly written as


A. Al3Cl.
B. AlCl3.
C. ClAl3.
D. Cl3Al.

2007-02-09 06:14:16 · 7 answers · asked by tami c 1

11. The molecular mass of sodium oxide (Na2O) is


A. 22.98977.
B. 38.98917.
C. 45.97954.
D. 61.97894.

2007-02-09 06:07:54 · 7 answers · asked by tami c 1

Nitrogen is NOT a poisonous gas but even then animals die in the atmosphere of nitrogen. WHY?
Neither does it react to form poisonous substance nor does it cause any harm to organs.Then why do animals die in the atmosphere of Nitrogen?

2007-02-09 06:06:17 · 14 answers · asked by Abhineet 2

Explain it in an easy way.
The best answer will be used as my research for this experiment.

2007-02-09 05:57:48 · 4 answers · asked by ledzepgirl♥ 2

Could you show me the solving process to get to the answer as well as help me get the answer?

2007-02-09 05:53:16 · 2 answers · asked by Anonymous

Does anyone know how to solve this? Thanks!

2007-02-09 05:33:18 · 2 answers · asked by Anonymous

What is the vapor pressure of CCl4 in torr? the vapor pressure of CCl4 is 673!! please explain how you came up with your answer!!!

2007-02-09 05:12:55 · 2 answers · asked by MEB 2

Does anyone know where i can find the basic Chemical structure of Collagen at? or what it is? thanks

2007-02-09 04:58:27 · 2 answers · asked by conkers 1

2007-02-09 04:52:43 · 2 answers · asked by vinceca2000 1

Oh yea can u explain it in ENGLISH!!
pleaz and thank u!=)
P.S. You info will my used a my research
so make it goodz!

2007-02-09 04:51:33 · 4 answers · asked by ledzepgirl♥ 2

Oh yea can u explain it in ENGLISH!!
pleaz and thank u!=)
P.S. You info will my used a my research
so make it goodz!

2007-02-09 04:51:19 · 2 answers · asked by ledzepgirl♥ 2

A 0.4505 g sample of CaCO3 was dissolved in a small amount of concentrated HCl and the resulting solution diluted to 250.0 ml. A 25.00ml sample of the solution required 24.25 ml of an EDTA(2-) solution for titration.
1) How many moles of CaCO3 were used?
2) What is the concentration of Ca2+ in the 250.0ml of CaCl2 solution?
3) How many moles of Ca2+ are contained in a 25.00 ml sample?
4) How many moles of EDTA are contained in the 24.25 ml used for titration?
5) What is the concentration of the EDTA solution?
HELP ME PLEASE FOR THIS QUESTION....U DONT REALLY NEED TO SHOW ALL WORK...PLEASE SIMPLY JOT WHAT U GET FOR AN ANSWER WITH LITTLE EXPLANATION...THANK YOU!!!!

2007-02-09 04:44:14 · 1 answers · asked by Anonymous

A 42 gram block of an unknown metal at 94.0oC was dropped into an insulated flask containing approximately 30.0 grams of ice and 25.0 grams of water at 0oC. After the system had reached a steady temperature it was determined that 9.0 grams of ice had melted. What is the specific heat of the metal? The heat of fusion of ice is equal to 333 J/g.

2007-02-09 04:43:08 · 1 answers · asked by adam s 1

The specific heat of aluminum metal is 0.902J/gK. How much heat, in joules, is required to heat a 58.5 gram sample of aluminum from -6oC to 27oC? Enter your answer in scientific notation with no units.

2007-02-09 04:42:44 · 5 answers · asked by adam s 1

2007-02-09 04:15:49 · 7 answers · asked by ns5 u 1

2007-02-09 04:09:11 · 3 answers · asked by liloofar 3

2007-02-09 04:01:45 · 16 answers · asked by Anonymous

2007-02-09 04:00:31 · 11 answers · asked by Anonymous

if electronic configuration of element is [xe]54 6S2 4F14 5D1then what will be its valency and what will its reaction and product with aluminium

2007-02-09 03:23:52 · 1 answers · asked by miinii 3

2007-02-09 03:09:00 · 4 answers · asked by Anonymous

Hi guys
I need to have a step by step solution way,I have the answers the weight percent of Cu2S in the Ore is 62.2% ,the weight Percent CuS in the Ore is 26.8 Percent.I need just Solution way

Copper metal can be prepared by roasting Copper Ore which can contain cuprite (Cu2S) and Copper (II) Sulfide.
Cu2S(s)+O2(g) then 2Cu(s)+SO2(g)
CuS(s)+O2 (g) then Cu(s)+SO2(g)
Suppose an Ore sample contains 11% impurity in addition to a mixture of CuS and Cu2S.Heating 100.0 gr of the mixture produces 75.4 gr of Copper metal with apurity of 89.5%.
What is the weight percent of CuS in the Ore?the weight percent of Cu2S?

2007-02-09 03:05:48 · 1 answers · asked by Mazi 1

When Hydrochoric acid is applied to a seashell, a colorless gas rapidly evolves. This indicates that the shell probably contains:
Phosphate
Carbonate
Chloride
Sulfate

Which of the following is most important in current industry production?
Be
W
Na
Al

Which of the following elements is most unlike the others?
Mg
Ca
Br
Pb

2007-02-09 02:59:59 · 6 answers · asked by Anonymous

chemical appendix

2007-02-09 02:48:20 · 4 answers · asked by MAjd A 1

8. Which of the following is one way to prevent the corrosion of iron?


A. Protect the iron from polluted air.
B. Add carbon to the iron.
C. Let the iron develop a natural coat of carbonate.
D. Paint exposed iron parts with protective paint.

2007-02-09 02:26:25 · 11 answers · asked by tami c 1

information so that millions of people will not descretate his grave?

2007-02-09 02:26:08 · 3 answers · asked by Anonymous

a liquid substance thought to be some kind of acid has been spilt on the floor
what steps would you take to clean this up?

2007-02-09 02:19:39 · 5 answers · asked by danity0414 2

2007-02-09 02:01:13 · 5 answers · asked by keentoknow 2

16. If water and oil are combined in a container, the resulting liquid is a(n)


A. emulsion.
B. suspension.
C. solution.
D. mixture.

2007-02-09 02:00:51 · 5 answers · asked by jennifer b 1

7. Which one of the following chemical equations is balanced?


A. 2NaCl + H2SO4 ? HCL + NaSO4
B. NH3 + H2O ? 2NH4OH
C. KOH + H2SO4 ? KHSO4 + H2O
D. 2Na + S ? 2NaS

2007-02-09 01:44:07 · 4 answers · asked by jennifer b 1

2007-02-09 01:38:15 · 6 answers · asked by andrew s 1