Chemistry - January 2007

i have science homework but i don't know how you work out the mass number or the number of neutronz an element has...

2007-01-14 07:01:08 · 7 answers · asked by big_yin 3

2007-01-14 06:47:38 · 5 answers · asked by Anonymous

2007-01-14 06:39:16 · 1 answers · asked by Baybee Bonkerz...x 1

the answer to this is about energy and temperature

2007-01-14 06:38:35 · 5 answers · asked by Jeevitha P 1

2007-01-14 06:26:27 · 9 answers · asked by Anonymous

1 - Is ethanol miscible in water?
2 - Does ethanol conduct electricity?

3 - Why hexanol evaporates more slowly than heptane? Is it because:

(A) Hexanol has larger molecules
(B) Stronger covalent bonds
(C) More bonding elements
(D) Hydrogen bonding between molecules

4 - Why methanal is soluble in water?

(A) Water can form hydrogen bonds with it
(B) Methanal has the smallest of all aldehyde molecules
(C) Water and methanal are both covalent
(D) Methanal forms hydrated ions in solution

2007-01-14 06:17:19 · 4 answers · asked by Marlon 1

I am doing a science project and I need help of where I could get acid and base. Not just any kind of acid or base. I need hydrochloric acid and base (NAOH). I am trying to make a pH of 1,4,10,and 14. That is why I need specific types of acid and base.

2007-01-14 06:07:16 · 3 answers · asked by ♥me 4 eva♥ 2

what is THE ALLTIME BEST WAY TO MAKE THEM

2007-01-14 05:52:54 · 5 answers · asked by Anonymous

the acid is in a solid state. I need all 3 to be in there dry solid state at the end.

2007-01-14 05:34:27 · 6 answers · asked by hurdlehorsegirl 1

I am really curious why?

2007-01-14 05:32:43 · 13 answers · asked by --Lost in this world-- 3

2007-01-14 05:29:32 · 4 answers · asked by Jenn 1

I am wondering where to place my carbon monoxide detector.

2007-01-14 05:26:03 · 8 answers · asked by Anonymous

2007-01-14 05:19:23 · 28 answers · asked by PAMELA C 1

What are they useful for?

2007-01-14 04:34:33 · 2 answers · asked by snoooopdogg 4

2007-01-14 04:26:39 · 4 answers · asked by Anonymous

You are preparing reagents for your dideoxy sequencing project. You want to make a stock solution of ddGTP (514.93 g/mol). How much ddGTP will you need to weigh out to make 1000µl of a 100mM stock?


a.5.15x10-1 grams

b.5.15x10-3 grams

c.5.15x100 milligrams

d.5.15x104 micrograms

2007-01-14 04:17:07 · 5 answers · asked by Anonymous

2007-01-14 03:56:01 · 3 answers · asked by Anonymous

Say you have only a UV absorption spectrometry facility. Device an experiment to prove that there is an conformational change of the enzyme upon binding to the substrate.

2007-01-14 03:55:16 · 1 answers · asked by arnab 2

2007-01-14 03:12:48 · 2 answers · asked by Anonymous

2007-01-14 03:06:49 · 2 answers · asked by killer326.tw 2

I'm not dumb, but feel a little dumb asking this. I'm assuming that the ice will also have a temp of minus 100 degrees F, even though it froze at 32 deg. F, but would it really keep drinks colder longer in the glass? If you got water ice as cold as dry ice would it work just as well keeping things cold????

2007-01-14 02:56:09 · 3 answers · asked by nose 4 1

extinction coefficient is wave length specific. explain!

2007-01-14 02:47:37 · 1 answers · asked by arnab 2

2007-01-14 02:43:08 · 5 answers · asked by fatma 2

What is Ammonium Sulphate and other salts as fertilizers? Please help me! thank you

2007-01-14 02:39:43 · 1 answers · asked by wannabe_smartass 1

spectroscopy)

2007-01-14 02:37:38 · 2 answers · asked by mask 1

2007-01-14 02:23:11 · 2 answers · asked by Anonymous

2007-01-14 02:08:53 · 1 answers · asked by reena p 1

I cannot grasp the concept of an Ionic compound. Mg3N2?
Where/how do you get the 3 and the 2? I have looked at pictures and studied this but it will not sink in.
Thank you

2007-01-14 01:40:23 · 4 answers · asked by loulou 1

silicon tetrachloride SiCl4 has polar bonds but the molecule isn't polar right?? How come?

What kinds of intra and inter molecular bonds are there?

2007-01-14 01:18:35 · 8 answers · asked by Anonymous

i was asked to draw dot and cross diagrams for the following covalent compounds,and then draw their shapes and state what the bond angles are,

H2O - I said was obviously water, with a bond angle of 104 degrees and the shape is bent.

H30+ - I said was a hydronium ion, with a bond angle of 107 degrees and the shape is pyramidal

-H402+ - I don't know what the hell this is lol

H202 (H-0=0-H) - I said is hydrogen peroxide, with a bond angle of 104 degrees and the shape is bent.

I cant show u my dot and cross diagrams but is the above right? And if you know what -H402+ is please let me know lol a chinese webpage came up as Methoniumion but i still dont know it

2007-01-14 00:58:50 · 3 answers · asked by yummygummybear2006 1