Chemistry - January 2007

what happens when light travels at an angle from water to air? ? ?

2007-01-21 02:47:05 · 2 answers · asked by Anonymous

Who was the first human to come up with the chemical equilibrium idea....like discovered the equation containing the concentration of reactants over that of the products....

2007-01-21 02:42:08 · 2 answers · asked by sphinx 4

which metals are FOUND as the elements and not compounds??

How does magnesium occur naturally? Why is it not found naturally?

How and why are metals like iron and aliuminium recycled??

please help...

thanks

2007-01-21 02:39:26 · 3 answers · asked by Anonymous

I'm curious as to wether the water vapor comes from the burning process, or if it is just condensed from the existing moisture in the air.

2007-01-21 02:36:32 · 2 answers · asked by pahinLA 2

The materials one can use are a bunsen-burner, clay triangle, wooden splint/ triangle, crucible and cover.

So by using only these materials how can one extract copper from copper carbonate?

2007-01-21 02:28:24 · 3 answers · asked by alanfreefall 2

2007-01-21 02:26:52 · 5 answers · asked by danielle 2

need info urgently for my xii exams..

2007-01-21 02:02:00 · 1 answers · asked by dincpurple 2

2007-01-21 01:20:03 · 4 answers · asked by Gregory C 1

What are the elements in Calcium hydroxide?
Please write the information in this format:

Compound: Calcium Hydroxide
Elements:
Symbols:
Valencies:
Formula:

2007-01-21 00:41:31 · 4 answers · asked by Anonymous

2007-01-20 23:57:15 · 10 answers · asked by sunny p 1

2007-01-20 23:55:48 · 2 answers · asked by sunny p 1

2007-01-20 23:53:29 · 2 answers · asked by sunny p 1

2007-01-20 23:47:19 · 1 answers · asked by lucky 1

what color would an alkaloid positive sample be if it will be added with Mayer's reagent?

what color would saponin positive sample be if it will be added with Mg turnings? HCl?

what color would a tannin positive sample be if it will be added with ferric chloride?

2007-01-20 22:37:40 · 1 answers · asked by bataS 1

Methanol, Ethanol, Propanol, Butanol, Pentanol
For example, Ethanol is the easist to produce on a large scale, what's the hardest?

2007-01-20 22:06:41 · 1 answers · asked by Matt S 2

can you please give me an analysis and some discussions about this experiment. if you don't mind, can you please give me a summary about this experiment. thanks...


-three31one-

2007-01-20 21:19:12 · 1 answers · asked by -three31one- 1

2007-01-20 20:57:10 · 7 answers · asked by www.saifzeeshan 1

Captain X of a ship has been told by his superiors that only a chemist can be trusted with the combination to the safe containing the dilithium crystals that power the ship. The combination is the pH of solution A, described below, followed by the pH of solution C. (example: If the pH of solution A is 3.47 and that of solution C is 8.15, then the combination to the safe is 3-47-8-15). The chemist must determine the combination using only the information below (all sol'n are at 25C)
Sol'n A is 50mL of a .100M solutionof the weak monoprotic acid HX
Sol'n B is a .0500M solution of the salt NaX. It has a pH of 10.02
Sol'n C is made by adding 15mL of .25 M KOH to solution A

What is the combination of the safe?

2007-01-20 20:30:53 · 3 answers · asked by Anonymous

Explain 105 in H20 (unshared o e- pair) which is responsible fo rbent shape , the role of electronegativeity in polarity; H bond and high heat and kinetic energy capacity, surfae tension.

2007-01-20 20:02:24 · 1 answers · asked by Christy 2

2007-01-20 19:02:48 · 4 answers · asked by Ivy 1

I have tried about a million ways to figure this problem and just don't know how. My professor told us to teach ourselves from the book but the book does not cover this type of problem or it is going over my head. Please explain how to solve it. Don't just give an answer I need to know how to do it for a test.



Nitroglycerin (227.1 g/mole) decomposes according to the reaction below.


4 C3H5N3O9(Liquid) yields 6 N2(gas) + 12 CO2(gas) + 10 H20(g) +O2(gas)

What total volume of gases is produced at 65 degrees C and 744 mm Hg by the decomposition of 5.00g nitroglycerin? (R=0.08206 L atm/mol k)

2007-01-20 18:09:15 · 4 answers · asked by cooterpie02 2

2007-01-20 16:56:24 · 2 answers · asked by Que~Nna 1

2007-01-20 16:56:00 · 5 answers · asked by inw99 2

245 mi on 11.2 gal of gasoline, what is the gas mileage in km/L? Can somebody tell me how the problem is set up and what the answer would be with the correct SF's? thanks

2007-01-20 16:35:09 · 1 answers · asked by nicki s 1

the density of air at 25C is 1.19 g/L. WHat is the mass, in Kg, of the air in a room that measures 12.5 X 15.5 X 8.0 ft?
how would I go about this???

2007-01-20 16:26:34 · 7 answers · asked by nicki s 1

A solution is prepared by mixing 74.0 mL of 5.00 M HCl and 36.0 mL of 8.00 M HNO3. Water is then added until the final volume is 1.00 L. Okay, I didn't quite get my first question and something strange is up with my scientific calculator, so I changed the numbers a bit just to confirm that I'm doing my calculations correctly...Please include the step by step calculations, thanks!

2007-01-20 16:23:36 · 1 answers · asked by Student_007 1

From the following data, calculate the total heat needed to convert 0.219 mol ice at -6.50°C to liquid water at 7.26°C.

Melting point at 1 atm 0°C
csolid 2.09J/g°C
cliquid 4.21J/g°C
ΔHfus 6.02 kJ/mol

2007-01-20 16:21:58 · 4 answers · asked by Anonymous

At 40°C, the value of Kw is 2.92 10-14. Furthermore, If the hydroxide ion concentration in a solution is 0.44 M, what is the pH at 40°C?

2007-01-20 16:18:54 · 5 answers · asked by Student_007 1

Anne was given a bottle containing a mixture of substances and was instructed to determine its contents. List the tests Anne would have to perform and describe the observations she is expected to make if the mixture contained carbonated water, rubbing alcohol, vinegar, and bleach.

use crystallization and distillation to get rid of these...they can be used in one method and not the other...

2007-01-20 15:30:03 · 2 answers · asked by GorGeOuS 3

Describe using temperature, pressure, and/or volume why it is dangerous to throw aerosol cans into a fire.

2007-01-20 15:27:11 · 3 answers · asked by Epitaph 2