Chemistry - September 2007

a) How many grams of hydrogen chloride are required to completely react with
24.4 g of gallium metal?


b) How many grams of gallium chloride are formed?

2007-09-29 04:27:10 · 1 answers · asked by chemistrysucks 1

It's often mentioned with regard to nuke fuels & war & radiation but, please excuse my complete ignorance of it, because I don't even know if it is solid, liquid or gas.

2007-09-29 01:26:27 · 10 answers · asked by Kitty Katty 4

2007-09-28 23:57:13 · 3 answers · asked by steven w 1

2007-09-28 21:48:33 · 3 answers · asked by bi 3

for example initial z=6 e=6 n=8 after alpha z=4 e= 6 n=6, so there would be a -2 charge assuming C-14 has alpha reaction

2007-09-28 21:20:01 · 1 answers · asked by Anonymous

its our assignment in chemistry hope u'll answer it!!!!thanksss

2007-09-28 20:26:33 · 2 answers · asked by lara 1

19.000
0.00006
1.6090 x 10 ^8
13600.
0.05305
3.2710
0.098000

2007-09-28 17:31:01 · 4 answers · asked by 41 1

In one experiment, 0.170 L of SnCl4 (d = 2.226 g/mL) was treated with 0.347 L of triethylaluminum (Al(C2H5)3); d = 0.835 g/mL).
What is the theoretical yield in this experiment (mass of tetraethylstannane, Sn(C2H5)4)?
If 0.194 L of tetraethylstannane (d = 1.187 g/mL) were actually isolated in this experiment, what was the percent yield?

2007-09-28 17:28:56 · 1 answers · asked by Anonymous

Organotin compounds play a significant role in diverse industrial applications. They have been used as plastic stabilizers and as pesticides or fungicides.
One method used to prepare simple tetraalkylstannanes is the controlled direct reaction of liquid tin(IV) chloride with highly reactive trialkylaluminum compounds, such as liquid triethylaluminum (Al(C2H5)3).
3SnCl4 + 4Al(C2H5)3 3Sn(C2H5)4 + 4AlCl3

In one experiment, 0.160 L of SnCl4 (d = 2.226 g/mL) was treated with 0.349 L of triethylaluminum (Al(C2H5)3); d = 0.835 g/mL).
What is the theoretical yield in this experiment (mass of tetraethylstannane, Sn(C2H5)4)?

ANS:

If 0.175 L of tetraethylstannane (d = 1.187 g/mL) were actually isolated in this experiment, what was the percent yield?

ANS:

2007-09-28 15:27:23 · 1 answers · asked by Discover.... 1

1.Which instrument would be more accurate for measuring the volume of a liquid- a beaker or a graduated cylinder?why?

2.Volume can be measured in units of cubic meters or milliters. when would you use cubic meters?Whe would you use milliters?

3.Is a precise measurement always accurate?explain please

2007-09-28 15:04:53 · 1 answers · asked by Anonymous

is there any 7th grade science project without growing crystals or ph levels? help? chemistry type of project?

2007-09-28 15:03:13 · 2 answers · asked by Anonymous

2007-09-28 13:09:00 · 6 answers · asked by amshaikh748 1

explain why a molar volume of a gas ar R.T.P. is greater than thast of the gas at S.T.P.

Ｏ2→Ｏ3 {AT HIGH VOLTAGE ACROSS THE GAS}
WOULD THE MASS OF THE GAS BE CHANGED AFTER THE CONSERVATION ? EXPLAIN YOUR ANSWER.
PS: O2 IS oxygen , O3 is ozone

2007-09-28 13:00:10 · 1 answers · asked by smooth lens 1

see i was always told that oxygen was flammable. and if you were in a 100% oxygen environment and lit a match it would all go kaboom. but now i hear that its not flammable. so i guess my question is:

if i were to somehow fill a vacuum sealed room with all oxygen, and lit a match what would happen.

2007-09-28 12:09:02 · 9 answers · asked by Anonymous

CH3--CH--CH2--C==CH-CH3
| |
CH3 CH3

the formula came up weird but the two CH3 on the second line are linked to the first CH and the single C

thank you for those who answered my other question of what it was called

2007-09-28 12:01:02 · 3 answers · asked by gotmilky2001 2

The question is like this:
A student performs a crystallization on an impure sample of biphenyl. The sample weighs 0.5g and contains about 5% impurity. Based on his knowledge of solubility, the student decides to use benzene as the solvent. After crystallization, the crystals are dried and the final weight is found to be 0.02g. Assumes that all steps in the crystallization are performed correctly, there are no spills, and the student lost very little solid on any glassware or in any of the transfers, why is the recovery so low?

2007-09-28 10:54:56 · 1 answers · asked by Anonymous

Sum up the following meanings ---

1.) Plasma
2.) ionize / ionized / ionization

and tell me how positive, and negetive charges are factors in each.

2007-09-28 10:40:46 · 2 answers · asked by Ben 2

2007-09-28 09:45:38 · 6 answers · asked by pamy k 1

Stoichiometry of a RedOx Reaction. (I)

Iron(II) ion, reacts with permanganate ion, in acidic solution to produce iron(III) ion and manganese(II) ion.
If exactly 60.0 mL of an Fe2+ solution is required to react completely with 75.0 mL of a 0.0950 M permanganate solution, what is the molarity of the Fe2+ solution?

2007-09-28 08:46:44 · 2 answers · asked by Anonymous

2007-09-28 08:41:06 · 8 answers · asked by Caramel 2

Suppose you do a GC analysis on a sample consisting of 15% A, 60% B, and 25% C by weight. A and B are volatile and have different retention times but C is nonvolatile under the conditions used and therefore does not generate a peak on the chromatogram. Assuming that you do not know that there is nonvolatile material in the sample, what will you conclude from the GC analysis,ie.,what percent of A and B would you calculate?

2007-09-28 08:35:31 · 2 answers · asked by Anonymous

2007-09-28 08:17:22 · 3 answers · asked by amlippie 1

2Mg + O2 = 2MgO
4Fe + 3O2 = 2Fe2O3
2Cu + O2 = 2CuO

2007-09-28 07:28:48 · 1 answers · asked by Anonymous

16. at 525 mm Hg and 85 degrees C, the volume of a sample of nitrogen gas is 26.8 L. what is the volume at STP?


A. 1 L
B. 10.9 L
C. 15.3 L
D. 15.3 L c, and d are same it shows on the test?...

2007-09-28 07:19:33 · 3 answers · asked by Anonymous

i saw a video in google about a man farting with a fire. i thought "is that possible?". i've been thinking about it for hours.

2007-09-28 07:14:52 · 13 answers · asked by Jennette L 1

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:

4NH3 + 5O2 ® 4NO + 6H2O
What is the theoretical yield of water, in moles, when 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

2007-09-28 07:13:10 · 1 answers · asked by PiNk-PrInCeSs 3

An subatomic parts of an atom are
1.electrons
2.protons
3. nuetrons

is there any other particles present in an atom ,if so what?

2007-09-28 06:07:58 · 1 answers · asked by HAH 1

in what type of titrations the benzene azo 2 napthol is uesful??? and what is its pH range???

2007-09-28 05:33:32 · 1 answers · asked by power 2

2007-09-28 05:00:50 · 2 answers · asked by smoothrinah_2008 1

2007-09-28 04:13:36 · 2 answers · asked by Anonymous