Chemistry - September 2007

2007-09-17 02:54:59 · 2 answers · asked by Anonymous

this is the formula.. help me please?>? please?? please?

C5H10O

2007-09-17 02:53:03 · 4 answers · asked by Marie C 2

laboratory report determination of sorbic acid in food that are store in the can

2007-09-17 02:49:37 · 2 answers · asked by Anonymous

wHY DOES IT YEILD THIS KIND OF RESULT?

2007-09-17 02:15:21 · 1 answers · asked by mom@oneeight 1

How can i draw cyclic ketones???? Can u give me a website that best describe these:

a. cyclic ketone, C6H8O
b. An aryl ketone, C9H10Oxygen
c. A diketone, C6H10O2
d.A 2-Bromo aldehyde, C5H9BrO

help me please??
i would appreciate it

2007-09-17 01:39:37 · 2 answers · asked by Marie C 2

2007-09-17 01:12:52 · 0 answers · asked by Anonymous

LPG is made up of propane, C3H8, and butane, C4H10, either stored seperately or together as a mixture. if a sample of C3H8 gas effuses through a tiny hole in 20 seconds, how long will it take a sample of C4H8 gas to effuse through the same hole under the same conditions?

2007-09-17 00:19:04 · 2 answers · asked by hanjew d 1

1.Why does diffusion takes place?
2.What are carrion feeders?example too

answer and get 10 points.or leave links.and still get 10 points.

~LP rulz~

2007-09-17 00:13:21 · 1 answers · asked by farzana 1

2007-09-16 23:27:36 · 8 answers · asked by nitish s 2

In an electrolysis experiment, electrons move from a more reactive metal to a less reactive metal (eg. from magnesium to zinc) right? I'm confused, please help...Thanks. :)

2007-09-16 19:37:35 · 4 answers · asked by Anonymous

Thank you!

2007-09-16 19:34:39 · 4 answers · asked by happysqueal 2

Why do atoms give off or take in energy whenever they gain an electron?

2007-09-16 19:00:59 · 1 answers · asked by Anonymous

In the Haber process nirtrogen reacts with hydrogen to give ammonia. What is the theoretical yield of ammonia in grams that can be prepared from 41.0 g of nitrogen and excess hydrogen?

please explain??

2007-09-16 17:28:38 · 1 answers · asked by burpzalot862 2

I need at least 2 differences please.

Thank-you.

2007-09-16 15:50:21 · 2 answers · asked by Anonymous

2007-09-16 15:02:15 · 3 answers · asked by juicyjunkie 1

I'm writting an essay about a dude who harmed his friend's eyes with acid during his chemistry class.

anyone know any type of acid that would harm your eyes (pretty badly) that is used in school?

2007-09-16 14:58:42 · 6 answers · asked by Anonymous

Please help.

2007-09-16 14:56:42 · 3 answers · asked by ??? 2

2007-09-16 14:54:30 · 1 answers · asked by John M 2

1. An unknown solid acid is either citric acid or tartaric acid. To determine which acid you have, you titrate a sample of the solid with NaOH. The appropriate reactions are as follows:

Citric acid:
H3C6H5O7(aq) + 3NaOH(aq) ---> 3H2O(l) + Na3C6H5o7(aq)

Tartaric acid:
H2C4H4O6(AQ) + 2NaOH(aq) ---> 2H2O(l) + Na2C4H4O6(aq)

A 0.956g sample requires 29.1 mL of 0.513 M NaOH for titration to the equivalence point. What is the unknown acid?

2007-09-16 14:37:45 · 1 answers · asked by Vanessa1027 1

A sample of gaseous neon atoms at atmospheric pressure and 0 contains atoms per liter. The atomic radius of neon is 69 . What fraction of the space is occupied by the atoms themselves? Thanks everyone

2007-09-16 14:35:29 · 1 answers · asked by Giant Donut 2

2007-09-16 14:22:13 · 6 answers · asked by Anonymous

Given the following data:
2O3 --> 3O2 DH = -427 kJ
O2 -->2O DH = +495 kJ
NO + O3 --> NO2 + O2 DH = -199 kJ


Calculate DH for the reaction
NO + O --> NO2

2007-09-16 14:07:41 · 1 answers · asked by Ashley J 1

2007-09-16 13:57:55 · 2 answers · asked by Jon P 1

These are for my chem. homework and I was wondering if I could get a few hints/formulas as how to solve these. I think I have the first one, but the second one is leaving me clueless...
help would be GREATLY appreciated!

1. What is the wavelength of light (in meters) whose frequency in the FM radiowave region is 103.9 MHz?

...and the really tough one...

2. The absorption of a photon of wavelength 6.71x10^2 nm causes an electron in a certain molecule to go from one energy level to a state of higher energy. Absorption of energy in this range causes an electron in the valence shell of a molecule to move to a higher level. If the higher electronic level has an energy of 4.840x10^-19 J, what is the energy of the lower electronic state?

2007-09-16 13:48:31 · 5 answers · asked by Britney 2

is nitrogen a more reactive element than oxygen?

2007-09-16 13:47:28 · 1 answers · asked by Anonymous

I don't understand how many significant digits you should have when you're measuring things. Say you're measuring on the cm side of a ruler and it shows 3.5 cm. Would you put 3.5 cm or 3.50 cm or 3.500 cm. I don't understand how many significant digits there should be. Can someone please explain it to me so I'll know how to measure anything?

2007-09-16 13:38:51 · 2 answers · asked by ... 2

what is specific gravity? and in what units is it expressed?

2007-09-16 13:24:05 · 3 answers · asked by Cole 2

2007-09-16 12:59:21 · 1 answers · asked by Tesline T 2

also is the russians new bomb really that powerful?

2007-09-16 12:57:26 · 4 answers · asked by weee 1

2007-09-16 12:27:10 · 3 answers · asked by Anonymous