Chemistry - February 2007

2007-02-02 05:47:09 · 10 answers · asked by frickenawesomekoreanandyouknowit 2

This is the questions : 1) the water that drips into the test tube is pure water , how can you describe away from testing it ?
2) what is left in the boiling tube at the end of the experiment ?
3) This is the process that is called distillation ?

2007-02-02 05:04:17 · 4 answers · asked by Hindu_ Latina 3

That is the IUPAC name but I am having a heck of a time trying to locate a more general name for the compound so that I can research it in scientific journals.....possibly a more experienced organic chemist may be able to help? Thanks!

2007-02-02 04:56:49 · 5 answers · asked by pMn 1

alum,sugar,and copper sulfate crystals

2007-02-02 04:47:23 · 3 answers · asked by U_SUCK!!!!! ; ) 1

2007-02-02 04:44:01 · 2 answers · asked by Andy CashKing 1

I've drawn one structure where there's a -1 charge on one of the oxygens. In another structure, I've come up with a +1 charge on the other oxygen. Is the last structure correct? seeing that the molecule initially has a negative charge?

2007-02-02 04:17:55 · 5 answers · asked by Anonymous

2007-02-02 03:38:24 · 4 answers · asked by nnzcrl 1

The vapor pressure of dichloromethane, , at 0.0 C is 134 mmHg. The normal boiling point of dichloromethane is 40.0 C. Calculate the molar heat of vaporization.
ln(P2)=ln(P1)+(heat of vaporization/R[gas constant]) (1/T1-1/T2) **R=8.3145 j/(mol*K)

2007-02-02 03:32:27 · 3 answers · asked by Anonymous

2007-02-02 03:29:48 · 0 answers · asked by laureneebell 1

I need a reliable chemistry site that can help me find the melting points of several chemicals. The ones i need include the melting points for caffeine, salicylic acid, NaCl (table salt), acetaminophen, and glucose.

2007-02-02 03:15:44 · 8 answers · asked by lpswimmer05 2

At a certain temperature the reaction

2N2O5 → 4NO2 + O2

is a first order reaction with t1/2 = 127.0 sec

What is the rate constant for this reaction (1/sec) ?

2007-02-02 03:08:25 · 4 answers · asked by enba18 1

At a certain temperature the reaction

SO2Cl2 → SO2 + Cl2

is a first order reaction with t1/2 = 147.0 x 102 sec

What is the rate constant for this reaction (1/sec) ?

2007-02-02 03:04:42 · 1 answers · asked by Marty Kay 2

Explain each of the following in terms of nuclear models:

1. The mass of an atom of 4He is less than the sum of the masses of 2 protons, 2 neutrons, and 2 electrons

2. Alpha radiation penetrates a much shorter distance into a piece of material than does beta radiation of the same energy

3. Products from a nuclear fission of a uranium atom such as 90Sr and 137Ce are highly radioactive and decay by emission of beta particles.

4. Nuclear fusion requires large amounts of energy to get started, whereas nuclear fission can occur spontaneously, although both processes release energy

2007-02-02 02:56:09 · 4 answers · asked by bosox1989 1

At a certain temperature the reaction

2N2O5 → 4NO2 + O2

is a first order reaction with t1/2 = 115.0 sec

2007-02-02 02:31:34 · 3 answers · asked by Foxychick 1

Does anyone know exactly how to perform spiking? I have a basic idea of what it is.... you add a portion of your standard to the sample. But how much of your standard should you add? Does it matter? eg suppose I want to spike 100 mls of a sample... what do I do?

2007-02-02 02:22:53 · 3 answers · asked by Other sheep 4

Thius is a study I'm doing now. A kind of wound dressing which is different from usual cotton bandages which is woven.

2007-02-02 02:10:34 · 1 answers · asked by mama_pinkychico 1

can you give me the formula, to convert my living years into seconds as up to yesterday noon. feb.1? my chemistry teacher is really lay and didn't teach it please.

2007-02-02 01:50:09 · 3 answers · asked by Anonymous

2007-02-02 01:29:06 · 1 answers · asked by Jessica & Noel S 1

2 HI(g) ----> H2(g) + I2(g)


100.0 mmoles of HI are initially in a 1.00 L container at 800 K After 400.0 seconds the concentration reduces to 0.0200 M.


What is the average rate of production of I2 in mmole / min ?

2007-02-02 01:25:33 · 1 answers · asked by manutd11191988 1

2007-02-02 00:47:39 · 4 answers · asked by jeyan 2

I did it using different kinds of alcohols with trifluoroacetic acid, the end product should be an ester and water, but water doesn't show up in the NMR spectra,

2007-02-02 00:42:15 · 2 answers · asked by joeymacaroni 2

The mosquito repellent like ALLOUT (45 ml. Bottle) are INEFFECTIVE despite costing Rs.1300/- per litre. WHICH is the EFFECTIVE Mosquito repellent as of now,available in the Indian market?

2007-02-02 00:19:33 · 5 answers · asked by vivekshan 1

help me

2007-02-01 23:59:27 · 2 answers · asked by Anonymous

help me of my assignment,,pls

2007-02-01 23:56:59 · 3 answers · asked by Anonymous

2007-02-01 23:55:58 · 3 answers · asked by P 1 1

they are - solid, liquid, gas , plasma, supercritical fluid , superfluid , colloid , supersolid , degenerate matter , quark gluon plasma , fermionic condensate , bose einstein condensate and
strange matter

2007-02-01 23:46:04 · 1 answers · asked by Anonymous

I do a experiment of shampoo dilution.I test the pure shampoo pH,then record the value. after that,I diluted the shampoo with distill water then i test the pH,I continue the step with adding more distill water.

What is the result i can get? the pH of shampoo ll increase or decrease.
Why you choose the answer ,explain.

Plz help me slove the question.Do anyone do the experiment before?

2007-02-01 23:39:20 · 5 answers · asked by Franky.Foo 1

the constituents of alloys are copper,bronze,duralumin,etc

2007-02-01 23:15:33 · 1 answers · asked by GURMAHIMA S 1

2007-02-01 23:12:27 · 1 answers · asked by Anonymous

from water, hexane, cyclohexene, propanone, ethyl ethanoate, ethanol, trichloromethane. which are polar and which are non polar

2007-02-01 23:08:55 · 5 answers · asked by Anonymous