Chemistry - July 2006

2006-07-19 09:37:30 · 2 answers · asked by Tyler Durdin 1

2006-07-19 09:12:53 · 5 answers · asked by Remzy 4

change in entropy=entropy created+q/t
says chemists. But what do they mean by "entropy created"?

2006-07-19 09:06:26 · 4 answers · asked by Remzy 4

Could someone please tell me a relatively easy way to make a non-dangerous smoke bomb that produces smoke on contact with a hard surface? I don't want to have to light a fuse or anything for it to work. Please help me!!!

2006-07-19 08:40:34 · 4 answers · asked by Anonymous

2006-07-19 07:38:02 · 11 answers · asked by rocken_heimer 2

we put salt on roads in winter to melt the ice, but when making homemade ice cream you put salt in the ice to make the ice cream freeze faster.

2006-07-19 07:34:14 · 11 answers · asked by horse123 1

2006-07-19 07:16:20 · 2 answers · asked by nihad t 1

When thorium (A=90) emits a beta particle, the resulting nucleus has an atomic number
a. 88
b. 89
c. 90
d. 92
e. none of these

2006-07-19 06:43:18 · 4 answers · asked by Anonymous

Hey all...

I have a question. I am teaching a summer school class over the summer right now and we are doing a unit on Hawaii. Unfortunately, I am a high school English Teacher teaching 6th grade science.

We have built a volcano in class, and I really want to make a SPECTACULAR effect because of all of the work we have put into it so far. I would really like to do something that is more exciting than a simple baking soda and vinegar reaction.

We have engineered the device with an 8oz styrofoam cup at the top for the materials. Another plastic cup fit inside would certainly mitigate anything that eats styrofoam (which I understand is quite a lot).

The simpler and less expensive the better folks. Thanks so much! I hope to have an answer by tonight so that I can buy the materials for tomorrow morning.

Thanks a lot!!!!!

P.S. FIreworks are illegal in the state I live in, in case anyone was suggesting that...

2006-07-19 05:49:53 · 4 answers · asked by Your Favorite Writer 4

2006-07-19 05:41:25 · 1 answers · asked by Anonymous

2006-07-19 05:36:22 · 2 answers · asked by Anonymous

I am performing a filtration experiment using some filter media where i need to find the upstream and downstream concentrations of oil in water. So, I was wondering if COD content of water sample can indicate the respective oil concentration in that sample.

2006-07-19 05:21:48 · 4 answers · asked by curious 1

because our teacher said that make a poem about atom with 5 stanzas.

2006-07-19 05:14:15 · 4 answers · asked by Anonymous

Not that I really need this now, but in Chemistry A-Level, I never understood what the equivalence point was on an acid base titration, when its NOT strong acid/strong base.

Surely if an acidic or basic salt can be made, that means H+ isn't = OH-

So what would a definition be?
Thank God they didn't ask me this in the exam :D

2006-07-19 05:06:37 · 5 answers · asked by snowpatrol161 2

2006-07-19 05:02:33 · 3 answers · asked by gmar 1

for eg. the glass tubes we use in school~thank you!

2006-07-19 05:00:01 · 4 answers · asked by shiorisei 1

In the case of chemical impurites it's easy enough to evaporate water to remove the impurities...but in the case of a radioactive contamination...is there a process seperate the radioactive particles?

2006-07-19 04:58:25 · 5 answers · asked by Dustin S 2

And what are the orbitals in the 5th and 6th energy levels?

Coz how come Iodine is in period 5 of the periodic table of elements when its greatest energy level is only in the 4th...erm, correct me if I'm wrong.

2006-07-19 04:49:33 · 3 answers · asked by Anonymous

I work in a processed lead manufactrung company, for which we are expanding our sales, in this regard I would like to know the utilities of lead in various fileds in order to develop/promote our product in the market.

2006-07-19 04:08:02 · 3 answers · asked by phoenix noir 2

is a kind of pressure

2006-07-19 04:05:43 · 5 answers · asked by Anonymous

2006-07-19 04:01:02 · 7 answers · asked by killer 1

Can some one help me!

2006-07-19 04:00:00 · 3 answers · asked by killer 1

how do diamers evaporate,,such big molecules.....
tell me evrythin u kno abt it...
thnx 4 yor ans

2006-07-19 03:39:01 · 2 answers · asked by dinc 2

2006-07-19 02:59:01 · 4 answers · asked by prabhjot k 1

2006-07-19 02:42:27 · 3 answers · asked by damanjot s 1

Over the years there have been many theories for the causes behind human spontaneous combustion, or HSC, there is however one thing that everybody seems to be missing in their search for the answer,
Urine!
Urine contains large amounts of urea. Urea is an organic compound consisting of carbon, nitrogen, oxygen and hydrogen. From this we get saltpeter/petre or potassium nitrate, indeed in 1600 saltpetermen would collect the saltpeter from toilets and even from church pews where the ladies would sit? this was then used in the manufacture of gunpowder.
Saltpeter when alight with other combustible materials will burn fiercely.
If we look at some of the photos of HSC we see the presence of chairs, beds and in a toilet a carpet. The majority of victims are old and likely to be incontinent. Over a period of time urine soaking through a chair or bed will leave a high concentration of potassium nitrate, all it takes to ignite this incendiary device is a spark, cigarette? static?

2006-07-19 02:27:57 · 17 answers · asked by Woody 1

2006-07-19 01:58:04 · 9 answers · asked by Anonymous

2006-07-19 01:03:25 · 4 answers · asked by Gopu M 1

2006-07-19 00:54:21 · 1 answers · asked by damanjot s 1

I want to try being gay. What should I do?

2006-07-19 00:47:57 · 22 answers · asked by angrysandwichguy2006 3