Chemistry - November 2007

It's a question of Organic chemistry of Benzene chapter.

2007-11-04 03:55:54 · 3 answers · asked by Kittu 1

It's a question of organic chemistry.

2007-11-04 03:47:49 · 5 answers · asked by Kittu 1

Why does helium make our voices go high when we breath it in from balloons.

2007-11-04 03:40:16 · 5 answers · asked by ? 3

Why does N(3-) have a larger ionic radius than that of O(2-)??

THANK YOU!

2007-11-04 03:34:18 · 4 answers · asked by Emma B 2

Please help. How would Idraw a picture of an atom with a photon being released? Describe best you can in words or give me a link please.

2007-11-04 03:23:52 · 2 answers · asked by ? 2

CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) H = -891 kJ

Calculate the enthalpy change for each of the following cases.
(a) 3.00 g methane is burned in excess oxygen.

b) 3.00 103 L methane gas at 730. torr and 26°C is burned in excess oxygen

2007-11-04 03:12:20 · 1 answers · asked by summitgirl06 1

what is the physical principle used in chromatography?

2007-11-04 03:08:07 · 1 answers · asked by Anonymous

1. 86.4g
2. 60.2g
3. 84.28g
4. 82.68g

2007-11-04 02:52:50 · 2 answers · asked by Raisa S 1

2007-11-04 01:25:23 · 1 answers · asked by Anonymous

C6H4(OH)2(aq) + H2O2(aq) C6H4O2(aq) + 2 H2O(l)

Calculate H for the above reaction from the following data.
C6H4(OH)2(aq) C6H4O2(aq) + H2(g) H = +177.4 kJ
H2(g) + O2(g) H2O2(aq) H = -191.2 kJ
H2(g) + 1/2 O2(g) H2O(g) H = -241.8 kJ
H2O(g) H2O(l) H = -43.8 kJ

Can i get a step by step demo please?

2007-11-04 01:16:25 · 1 answers · asked by summitgirl06 1

2007-11-04 00:58:32 · 1 answers · asked by ac 1

i really need the awnser it is a test on monday and i am revisning please can someone tell me the awnser!?!

2007-11-04 00:46:48 · 3 answers · asked by shippay 2

Trace metals in geochemistry is defined as 'all elements except the eight abundant rock-forming elements: oxygen, silicon, iron, calcium, potassium, and magnesium'

2007-11-03 23:57:58 · 1 answers · asked by Anonymous

2007-11-03 22:40:33 · 6 answers · asked by MaryJOy G 1

This experemet called Iodoform Test for identification of carbonyl group.
Please when you answer my question tell me your Referance (Source) it is very important

2007-11-03 22:33:12 · 2 answers · asked by King of the Kings 1

2007-11-03 21:45:22 · 2 answers · asked by Anonymous

A 14.9g sample of element A reacts incompletely with a 7.11g sample of element B. What is the total mass of the product plus the portion of A that did not react?

2007-11-03 21:35:06 · 2 answers · asked by bugsquirt24 3

2007-11-03 21:30:12 · 2 answers · asked by kdat 1

2007-11-03 21:10:35 · 2 answers · asked by janice r 1

Ok for science i have to do this assigment, which asks the hypothesis, "The hotter the water is, the more salt it will dissolve", i got a question asking which would be the indendant, dependant && controlled variles in this experiement, anyone know, cause i have no idea!!

2007-11-03 20:42:41 · 2 answers · asked by ♫ 4

It is disprortionately the high sensitivity of ethdium at low DNA concs that is probably causing the lack of valleys between peaks. Putting it another way, its lack of linearity at high DNA concs. This is well known as a general property of fluorescence.
is that true and where i can find out more about this?

2007-11-03 20:04:40 · 1 answers · asked by loser 3

ok
what does the atomic number represent?
nubmer of electrons?protons?neutrons?


and what does the atomic mass represent?
electrons?neutrons?protons?

plz answer soon

2007-11-03 17:05:31 · 16 answers · asked by Anonymous

Please, look at the picture (linked image) to solve the question below..
http://rokin.mireene.com/no2cl.gif


For the Lewis diagram, above, determine:

The overall charge of the molecular species shown.
The formal oxidation number of the nitrogen atom.
The formal charge on the nitrogen atom.


Would some one please help me?
Thanks in advance!

2007-11-03 16:36:13 · 2 answers · asked by Tuberose 1

2007-11-03 15:55:45 · 9 answers · asked by colincameron1 1

a. circle, square, triangle.
b. square, square, triangle.
c. triangle, triangle, triangle.
d. circle, circle, triangle, square.
pleasee help!!!!!!!

2007-11-03 15:41:05 · 2 answers · asked by Diana B 2

2007-11-03 14:50:31 · 5 answers · asked by V 1

...of the following reactions.

1.) An aqueous solution of sodium hydroxide reacts with an aqueous solution of hydrochloric acid, yielding water and sodium chloride.

2.) An aqueous solution of sodium hydroxide reacts with an aqueous solution of ammonium chloride, yielding aqueous ammonia (NH3), water, and sodium chloride.

3.) An aqueous solution of hydrochloric acid reacts with aqueous ammonia, NH3, yielding aqueous ammonium chloride.

Can someone please help me with this?

2007-11-03 14:42:55 · 2 answers · asked by eclipsegt_01_03 2

i thought that NaHC2O4 in water would produce NaOH (a strong base) and also H2C2O4 (oxalic acid, weak acid) therefore the solution would be basic, but the back of the book says it should be acidic. Why is that? Am i wrong or the book is wrong?

2007-11-03 14:42:26 · 1 answers · asked by Holymasteric 3

Starting with equal moles of each solute, predict the direction in which the following reaction will proceed.
H3PO4(aq) + HCO3-(aq) = H2PO4-(aq) + H2CO3(aq)

a. to the right
b. to the left
c. no net reaction

If you know, please answer

thanks!

2007-11-03 14:39:34 · 1 answers · asked by Jamil V 1

to water and diluting a final volume of 100 mL?

1. 23.8 g
2. 0.028 g
3. 0.045 g
4. 0.28 g
5. 0.14 g

2007-11-03 14:35:06 · 3 answers · asked by cloud851 5