Chemistry - July 2007

ethanol and water are completely miscible (they dissolve in each other in all proportions)

when the two substances are mixed, is randomness increased or decreased?

heat is liberated in the dissolving process. does the tendency toward minimum energy favour the separated pure substances, or the solution of one in the other?

why are they completely miscible?

2007-07-02 06:10:03 · 4 answers · asked by Anonymous

2007-07-02 06:00:53 · 3 answers · asked by tammysmith302 1

in terms of...

change in observable properties
and
energy and entropy state

2007-07-02 05:59:06 · 3 answers · asked by Anonymous

This particular experiment involves the oxidation of aromatic side chain. It is used as a way to crystallize chlorobenzoic acid. I want to understand why its important not to simply use an ice bath.

2007-07-02 05:46:11 · 1 answers · asked by Anonymous

2007-07-02 05:45:38 · 2 answers · asked by ahpiau22 1

a boat carrying illegal drugs leaves a port and travels @63km/h.a coast guard cutter leaves the port 24 min. later &travels @75km/h in pursuit of the boat.find the times each has travelled when the cutter overtakes the boat with drugs

2007-07-02 05:40:03 · 3 answers · asked by elva f 2

2007-07-02 05:28:38 · 3 answers · asked by Anonymous

2007-07-02 05:24:57 · 1 answers · asked by brian b 1

2007-07-02 05:12:32 · 2 answers · asked by usman a 1

what is the specific factor of the two compounds that could distinguish one from the other? reply asap!!! tnx!

2007-07-02 05:04:19 · 3 answers · asked by louie 2

2007-07-02 04:44:20 · 3 answers · asked by alex h 3

I want to use this photoactive emulsion directly upon metal sheet to expose my designs and then will do acid etching of exposed metal part... please suggest, thanks.

2007-07-02 04:30:48 · 1 answers · asked by hrishi 1

how does the parameters of pKa and Ka determine which is stronger?

2007-07-02 04:17:20 · 3 answers · asked by sharen s 2

a math question .please help.

2007-07-02 04:12:29 · 5 answers · asked by elva f 2

5. Determine the number of moles of Krypton contained in a 3.25 liter gas tank at 5.80 atm and 25.5 °C. If the gas is Oxygen instead of Krypton; will the answer be the same? Why or why not?

1.
If the outside of the flask is not dried after vaporizing the liquid, will the unknown's calculated molecular weight is too high or too low? Explain?
2.
Suppose the atmospheric pressure is assumed to be 1 atmosphere instead of its actual value. How wills this error affects the molecular weight of the unknown? Explain.
3.
If the vapor's volume is assumed to be 125 mL instead of the measured volume, what is the percent error of the unknown's calculated molecular weight? Show your work.
4.
If the entire unknown does not vaporize in the 125 mL Erlenmeyer flask, will the reported molecular weight be too high or low? Explain.

2007-07-02 04:09:59 · 2 answers · asked by Anonymous

Looking to use an ethanol burner in my fireplace which puts out 13000 btu's, hoping to place on the burner decorative colored glassel products which are only safe to 1200 farenheit. Is the glass safe to use on the ethanol burner?

2007-07-02 04:04:30 · 2 answers · asked by CARL F 1

thx!

2007-07-02 04:00:04 · 6 answers · asked by formystudies6 1

I need your answers right away. Thank you. :-)

2007-07-02 03:14:21 · 6 answers · asked by Captain Jadeinne Sparrow 3

2007-07-02 03:09:11 · 1 answers · asked by annlee2289 1

do these fatty acids can be convert into methyl ester? can the cashew shell oil be use as biodesiel?

2007-07-02 02:03:18 · 1 answers · asked by Anonymous

when i added 12 M HCl to a saturated 5.4 M NaCl the solution bubbled and fizzed and a line of separation was formed. The question asked me what the Cl- concentration in the original solution and i think its 5.4 M that it asked after the addition of 12 M HCl and i think it 12+5.4 which is 17.4 M, than it asks me to explain in terms of the relative Cl concentration in the two solutions, and it terms of the equilibrium NaCl>< Na+Cl can someone help me analyze that question?

2007-07-02 01:43:10 · 1 answers · asked by ... 3

do you know the uses of the following laboratory tools:

triangular file
iron clamp
adapter
reagent bottle
extension clamp

pls. answer...tnx!

2007-07-02 01:30:08 · 1 answers · asked by xtian 2

2007-07-02 01:15:16 · 2 answers · asked by rohini k 1

Does anyone have any suggestions on a good chemical to sanitize an active carbon bed? I have a water plant fitted with an active carbon bed after softeners. The carbon bed is becoming a source of bacteria growth and I would like to sanitize it. any suggestions? Heat is not possible due to the design of the plant.

2007-07-02 00:22:07 · 1 answers · asked by lucky7bear2002 2

2007-07-01 22:48:37 · 4 answers · asked by imran qureshi parasia m.p.india 1

identify which peaks and wavlength (cm^-1).
also need identifcation of bands like C=O strech.

2007-07-01 21:44:02 · 3 answers · asked by Q 1

a) when the concentration of the carbonate is 1.0E-06M
b) or when its 100times greater (1.0E-04 M
the equilibrium process is NiCO3(s)= Ni (aq) +CO3(aq) ksp=6.6E-9

2007-07-01 18:59:20 · 1 answers · asked by its me 1

what is the mass of a gas that has 48.9liters a pressure of 724torr 25 degrees C and molecular weight of 345g/ mole?

2007-07-01 18:27:19 · 2 answers · asked by Tommy D 1

They leave smoke behind, and I was just wondering if they're are in any way harmful to the air.

2007-07-01 16:41:26 · 3 answers · asked by Kayla [] 1

2007-07-01 16:06:12 · 6 answers · asked by Anonymous