Chemistry - August 2007

Please also provide another reaction with benzoic acid, although I have a feeling that the mechanism is the same. I know that there will be a formation of some colored complex, however, I don't know the formula to this. Answers are greatly appreciated. Thanks!

2007-08-15 20:13:27 · 2 answers · asked by DrJamerlan 2

Given the solution is prepared by boiling 4g of hydroxyammonium sulphate, (NH3OH)2 SO4 per dm3 with excess iron(III) ammonium sulphate and dilute sulphuric acid.

2007-08-15 20:12:40 · 1 answers · asked by teokz2002 1

2007-08-15 19:48:33 · 3 answers · asked by Adeel 2

How do you write the net ionic equation for the Al3+ cation to show that it is in group 3??

2007-08-15 19:34:06 · 1 answers · asked by Vienna 3

32. What is the minimum temperature required for the spontaneous conversion of CCl4(l) to CCl4(g) when delta H is 573 kJ/mol and delta S is 1.64 kJ/mol x K???
a. 76 degree C
b. 89 degree C
c. 189 degree C
d. 215 degree C
e. 349 degree C

2007-08-15 18:25:27 · 3 answers · asked by Kristin R 2

I cant get this one.

20. All of the following statements are true except???
a. delta H is relatively temperature independent
b. delta S is relatively temperature independent
c. delta G is relatively temperature independent
d. K is temperature dependent
e. If delta G = 0 then K =1

2007-08-15 18:16:48 · 2 answers · asked by Kristin R 2

okay.
is sand
pure substance?
or
mixture?
if it is.
is it homogenous or hetergeneous mixture?

2007-08-15 17:47:37 · 7 answers · asked by Anonymous

Most of the human body is made up of water, H2O, with cells consisting of 65-90% water by weight. Therefore, it isn't surprising that most of a human body's mass is oxygen. Carbon, the basic unit for organic molecules, comes in second. 99% of the mass of the human body is made up of just six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.

1. Oxygen (65%)
2. Carbon (18%)
3. Hydrogen (10%)
4. Nitrogen (3%)
5. Calcium (1.5%)
6. Phosphorus (1.0%)
7. Potassium (0.35%)
8. Sulfur (0.25%)
9. Sodium (0.15%)
10. Magnesium (0.05%)
11. Copper, Zinc, Selenium, Molybdenum, Fluorine, Chlorine, Iodine, Manganese, Cobalt, Iron (0.70%)
12. Lithium, Strontium, Aluminum, Silicon, Lead, Vanadium, Arsenic, Bromine (trace amounts)

So yet why can we not make humans ourselfs? What is missing?

2007-08-15 17:43:14 · 2 answers · asked by Anonymous

2007-08-15 16:45:49 · 1 answers · asked by mrsjoshgroban 1

My theory on the origin of life is pretty basic, a chance bonding of the elements forming DNA, but I don't understand what changed about the chemicals to form sentient life. What is the missing factor? (No religious crap)

2007-08-15 15:18:57 · 7 answers · asked by Anonymous

2007-08-15 15:03:25 · 5 answers · asked by Hoshi K 1

how is temperature and volume related?

2007-08-15 13:57:30 · 10 answers · asked by Pre lives on 5

OK so the question is: Which direction would the plunger go if the bunsen burner was placed underneath the container?

2007-08-15 13:38:24 · 1 answers · asked by Pre lives on 5

after you supercool water and it freezes if you let it melt can you supercool it again

2007-08-15 13:29:40 · 2 answers · asked by hustlercane 1

in distillation, would increasing the heating rate affect the boiling point? why? explain in terms of vapour pressure and the pressure of the laboratory.

2007-08-15 12:14:54 · 2 answers · asked by Anonymous

How come the order of filling the atomic shells is so strange? For example, why does it jump from Ar (1s^2 2s^2 2p^6 3s^2 3p^6) to 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 for K? Why doesn't it first fill the 3d orbital? Also, from V (1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^3) I notice that it jumps to (1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^5). Why does one of the electrons just leave the 4s orbital and jump into the 3d orbital. Is it more stable that way or something? I don't see how it could be though... I mean, isn't a full orbital (i.e. 4s^2) more stable than a half-full one (i.e. 4s^1)?

Thanks for any help!!!!!!!

2007-08-15 12:08:39 · 1 answers · asked by Anonymous

??flatulism?? How to stop it .. where does it come from ??

2007-08-15 11:52:18 · 4 answers · asked by arizona953gb@yahoo.com 1

1. What is the balanced molecular equation for a reaction between aqueous silver nitrate and aqueous sodium chromate?

2. What is the balanced complete ionic equation for the reaction?

3. What are the spectator ions in the reaction?

4. What is the net ionic equation for the reaction?

**Thanks in advance!**

2007-08-15 10:06:29 · 1 answers · asked by Verushka 1

Anyone know what the electron geometries of Phosphorus Trifluoride & Phosphorus Pentafluoride are? Also, what are their polarity?

2007-08-15 09:40:52 · 5 answers · asked by Verushka 1

Find the pH of lemon juice. Using the pH, show how to find the hydrogen ion content by using the logarithmic formula. Round to 10 decimal places.can you please help?

2007-08-15 09:01:54 · 7 answers · asked by pp1976 1

How would you prepare 1.00L of a 0.50M solution of each of the following?

a) NiCl2 from the salt NiCl2 . 6H20

I know I have to find the molar mass, as advised by other people, but the problem is that I don't know whether or not to include the 6H2O into it if the question said NiCl2 from the salt NiCl2 . 6H20.

Thank you so much in advance if you can help me out with this question.

2007-08-15 08:56:59 · 2 answers · asked by Andrew 2

i need to know please

2007-08-15 08:39:47 · 7 answers · asked by ? 2

Why does a bottled water placed in a freezer that appears to not be frozen turn to slush/ice when it is opened and you take a drink from it?

2007-08-15 08:13:40 · 3 answers · asked by poncholock 1

why does water have such a high specific heat capacity ?

thanks

2007-08-15 08:06:46 · 2 answers · asked by harry m 6

a.    CH3 CH3
             l    l
CH3 - C = C - CH3

b.
CH3       CH3
 l                l
C --- C - CH - CH2 - CH3

c.
CH2 = C - CH - CH3
             l        l
          CH3   CH2 - CH3

d. 4-methyl-1-pentyne
e. 2,3,3-trimethyl-1-hexene
f. 3-ethyl-4-decene

Im a sophomore going into AP chem next year doing summer homwork, and I really need help with cis-trans geometric isomerism. The book doesn't say much about it. If anyone could post links for more info / help thanks.

2007-08-15 07:53:54 · 4 answers · asked by d 1

Copper metal reacts with nitric acid to produce copper nitrate, water and nitric oxide (in the reaction shown below). An inorganic chemist placed 100.0 mg of copper powder into a reaction flask with 100.0 mL of 0.037 M nitric acid (HNO3). After allowing the reaction to proceed to completion, he evaporated the contents of the flask to dryness. To the correct number of significant figures, how much solid material remains in the flask?

HNO3(aq) + Cu(s) Cu(NO3)2(s) + H2O(l) + NO(g

2007-08-15 06:48:10 · 2 answers · asked by Kristina D 1

If it were possible to make a continuous circular ring of tin atoms one row of atoms wide, what would be the approximate mass of this piece of jewelry assuming the width of the average human finger is 1 cm? The atomic radius of a single tin atom is 158 pm and the density of tin is 7.26 g/cm3

2007-08-15 06:35:25 · 1 answers · asked by Kimmy D. 1

For nuclei larger than Ne, the nuclear radius in Fermis (10-15m) is well-approximated by the formula: R = 1.2 A1/3 wherein A is the total number of nucleons. Assuming all of the atomic mass is in the nucleus, and that the nucleus is spherical, estimate the nuclear density of 89Y.

2007-08-15 06:25:07 · 1 answers · asked by Kimmy D. 1

I can't find the freezing point for oil. Could someone help me. I'am looking for what temperature hair oil would freeze in. I'am just trying a wacky experiment :-D .

2007-08-15 04:01:35 · 4 answers · asked by smarty#1 2

A new grill has a mass of 30.0 kg. You put 3.0 kg of charcoal in it. You burn all of it and the grill has a mass of 30.0 kg. What is the mass of the gases given off?

Answer with work, if possible.

2007-08-15 03:51:43 · 7 answers · asked by aaadaj 1