Chemistry - August 2007

2007-08-11 12:51:46 · 3 answers · asked by toolmaker 1

2007-08-11 10:22:35 · 3 answers · asked by mcmamma13 2

2007-08-11 09:42:08 · 44 answers · asked by I dont know 4

2007-08-11 08:50:38 · 4 answers · asked by Anonymous

The directions say predict the product of the following reactions.

The equation is:
Mg(OH)2 + AgCl

The answer he gave me for the products is:
Mg + OH + AgCl

I don't understand why the answer is not MgCl2 + AgCl.
Please help!!!

2007-08-11 08:00:42 · 5 answers · asked by aweembaway_aweembaway 1

I just moved into an apartment (well, it's a section of a house) and the bath has sliding doors. On the slider where the rollers are, there is quite a bit of mold and stuff that has collected over the years and I really would like to get rid of it. I've tried traditional cleaning agents...including comet, and even let it sit there over night but it doesn't do anything.

Is there any time of acid I can make easily that will burn through that gunk? I figured it'd be more fun to make it. I heard you can buy HCl but it's like $100 for a gallon but I don't have that kind of money.

Any ideas from genius chemists out there would be helpful : )

(I tried searching on Google but I only found forums where everyone would just say "vomit" and other stupid answers.

2007-08-11 07:17:30 · 7 answers · asked by Daw 1

36.0g of steam at 100.0 degrees celcius was condensed to water and cooled to 25 degrees celcius. Find the heat released (in kJ)

I have the data for heat of fusion of ice (6.01 kJ/mol), the heat of vaporization of water (40.65 kJ/mol), and the specific heat Capacity of ice, water and steam. I DONT however have the heat of condensation of steam... and I'm really not sure how to find it. I know its a total energy problem, so kinetic energy + potential energy --> answer (total energy). The answer to the entire problem is given (92.5 kJ) but I dont know how to get it.

Any help is VERY much appreicated! My diploma exam is on monday!

2007-08-11 06:38:57 · 3 answers · asked by sahariah 3

I added some vineger to a jam can and an iron nail and both started to rust.Explain?

2007-08-11 06:03:52 · 8 answers · asked by Adhir M 1

involving the formation of soap

2007-08-11 03:25:14 · 2 answers · asked by mirian77 2

Diluted silver nitrate that is used in school labs.

2007-08-11 03:10:43 · 6 answers · asked by Charlotte_T 2

involving the formation of soap

2007-08-11 02:07:02 · 2 answers · asked by mirian77 2

what may be some possible solute for a school chemistry experiment testing the molar heat of solutions?

2007-08-11 02:03:33 · 2 answers · asked by i_luv_leoku_4eva 1

Place pieces of mossy zinc (about 5g) in the erlenmeyer flask. Add 2 ml of copper (II) sulfate solution through the thistle tube. make sure all the connections are air tight. Put 3 test tubes filled with water to collect gas. Provide the test tubes with stopper. Pour 6N HCl through the thistle tube until the zinc is covered. If the reaction becomes sluggish, add more acid. Collect three test tubes of the gas Stopper the test tubes tightly under water and place them in the rack with their mouths downwards. Wash the remaining mossy zinc and return it to the stockroom.

2007-08-11 01:03:09 · 1 answers · asked by Anonymous

all types

2007-08-11 00:59:51 · 5 answers · asked by aasma adeel 1

Place 5cc of sodiu hydroxide in a test tube and add a small piece of zinc dust. If it does not begin to react immediately, warm the mixture and the test gas evolved with a burning splint.

2007-08-11 00:55:46 · 1 answers · asked by Anonymous

Place 5cc of sodium hydroxide in a test tube and add a small piece of aluminum turning. If does not begin to react immediately, warm the mixture and the test gas evolved with a burning splint.

2007-08-11 00:52:40 · 1 answers · asked by Anonymous

2007-08-10 23:12:24 · 9 answers · asked by Abz* 2

2007-08-10 21:56:41 · 2 answers · asked by Anonymous

2007-08-10 21:16:45 · 4 answers · asked by seen2z 1

He said in his theory that matter was composed of small particles that could not be changed, created, or destroyed. However, we can split atoms and we can add or remove electrons, can't we?

2007-08-10 21:12:11 · 7 answers · asked by Anonymous

I found this experiment on permanent markers and I will be cutting out paper strips, and I have to draw a small dot near the bottom of the strip using the permanent marker and then hang it into a jar of 'solvent' (water, vinegar, nail polish remover.. etc) and my teacher said something about looking for the colors of the 'dot' rising up? what is the aim of this experiment? what is it investigating? T_T and what kind of markers should i be using? 3 markers of the same brand but different color? i'm really lost...

2007-08-10 21:10:39 · 4 answers · asked by another_labelx 1

4Fe + 3O2 ----> 2Fe2 O2

I think that's supposed to be the chemical reaction for rust. I tried to write it out as close as possible. Anyway, the reactants are supposed to be in the product, right? I see 4 iron elements but only 1 oxygen element on the product side. The reactant side had 3 of them so what's going on?

2007-08-10 21:09:09 · 4 answers · asked by Anonymous

If possible, how to explain it?
Why it is possible?

plz help me..
Thanx.

2007-08-10 19:14:35 · 3 answers · asked by Doc^chem 2

2007-08-10 18:27:35 · 3 answers · asked by Anonymous

If the short half life of carbon 14 makes it inaccurate to date artifacts that are older than 50000 years and other radioactive isotopes have longer half lives, why do scientists not use these other radioactive isotopes such as potassium-40 and uranium-235 to date an artifact?

2007-08-10 16:26:32 · 2 answers · asked by Anonymous

39. The equilibrium system 2H2S(g) <-> 2H2(g)+S2(g) at a given temp was found to contain 1.0 mol H2S 2.0 mol H2 and 0.40 mol S2 in a 2.0 L containter the equilibrium constant is ???

40. Given the equilibrium S)2Cl2(g) <-> So2(g)+Cl2(g) delta h =+67 kJ the concentration of SO2 at equilibrium will be increased by???

41. In which of the following reaction does a decrease in the volume of the reaction vessel at constant temperature favor formation of the products???
a. H2(g) +I2(g)<-> 2HI(g)
b. MgCO3(s)<-> MgO(s) <-> MgO(s)+CO2(g)
c. NO2(g)+CO(g)<-> NO(g)+CO2(g)
d.2H2(g)+O2(g)<-> 2H2O(g)
e. 2O3(g)<->3O2(g)

42. For a specific reaction which of the statements can be made about an equilibrium contant?
a. it always remains the same
b. it inc. when the concentration of one of the products is inc.
c. it changes with changes in the temp
d. it inc. when the concentration of one of the reactants is inc.
e. it can be changed by the addition of a catalyst

2007-08-10 15:48:02 · 3 answers · asked by Kristin R 2

when sulfur and oxygen react to form sulfur trioxide?

2007-08-10 15:36:22 · 2 answers · asked by Anonymous

pls help me!!

2007-08-10 15:33:07 · 2 answers · asked by jenny74 1

Cu + HNO3 --> Cu(NO3)2 + NO2 + H2O

2007-08-10 15:32:39 · 2 answers · asked by Anonymous

pls. help!!!

2007-08-10 15:27:04 · 1 answers · asked by jenny74 1