Chemistry - September 2007

2007-09-07 09:27:07 · 4 answers · asked by sincere12_26 4

how can i solve it?

2007-09-07 09:22:51 · 3 answers · asked by shima 1

How is mountain water turned into clean, safe, drinking water?

2007-09-07 09:16:02 · 2 answers · asked by Steve W 1

rubidium reacts violently with water, what chemical change causes that.

2007-09-07 08:23:53 · 4 answers · asked by Jeffery C 1

does anyone know how to remove oxidation from nickel?
I have old nickel coins that have crud all over them, and I have tried all the conventional methods and most do not work.
now the only things remaining are the harsher acids. thanks

2007-09-07 08:03:06 · 6 answers · asked by art_flood 4

3 reasons please.
Thanks,
Lorna

2007-09-07 07:59:03 · 13 answers · asked by Anonymous

I think it's a liquid but I'm not entirely sure.
xx

2007-09-07 07:54:41 · 5 answers · asked by Anonymous

Why is it that companies use lead in the paint? Is it cheaper to make or what? I'm really curious!!!!!!!!!

2007-09-07 07:43:51 · 4 answers · asked by Junior 2

1. If the hydroxide ion concentration of a solution is 3.68 x 10-2 M, what is the hydrogen ion concentration and pOH?

2. If the hydrogen ion concentration of a solution is 9.58 x 10-5 M, what is the pOH and hydroxide ion concentration?

3. When the pOH = 10.5, what is the hydroxide ion concentration?

4. The hydrogen ion concentration of a solution is 6.25 x 10-12 M, what is the hydroxide ion concentration, pH, and pOH?


Please, help me with these.

2007-09-07 06:53:29 · 1 answers · asked by Anonymous

What spectrum does these elements fall in...

a) mercury

b) hydrogen

c) helium

d) sodium

e) white light

2007-09-07 06:51:18 · 1 answers · asked by Anonymous

I have Glaucoma, and I use Timoptol 0.5.
I travel to several countries, and, sometimes, it is simply not available (or very costly).
Timoptol is made of:
Mono and "bi-basic" sodium phosphate, Sodium hydroxyde (to rectify the Ph solution) and water for "injectables", and a "conservant" of chlor(ure/ite) of "benzalconio".
Is it any way to manufacture it my-self (safely, with a good small chemistry lab) and how ?

2007-09-07 06:49:50 · 1 answers · asked by just "JR" 7

I was watching how its made, the steel episode, and i was wondering... How long would it take? and the pain... wouldn't the extreme heat overload the part of your brain that feels pain, causing you to pass out?

2007-09-07 06:20:02 · 12 answers · asked by alex e 1

2007-09-07 05:55:35 · 4 answers · asked by Anonymous

what state of matter is it?

2007-09-07 05:08:09 · 5 answers · asked by mathi kumar 3

I know nothing and professor wont help.

45.6/ 2.4=

12.57-6.2=

(754+0.8)/1.3=

(49.53 x 1.20) + 12=

also:

the density of osmium is reported by one source to be 22610 kg/m^3. What is the density in g/cm^3? What is the mass of a block of osmium measuring 10.0 cm X 8.0cm X 9.0 cm?

2007-09-07 04:59:22 · 1 answers · asked by set2k6 1

I am doing a report on doctors that work with the human digestion system. If you have any other information about enterlogy,proctology, and gastrology. Please tell me.

2007-09-07 04:21:07 · 1 answers · asked by Rosalie Cullen 3

I think it is 39K because it has less neutrons. But I have no idea.

2007-09-07 02:33:47 · 6 answers · asked by Molly❀ 3

Pls help me explain the breathing process through chemical aspect its for my chemistry subj tnx

2007-09-07 02:17:25 · 5 answers · asked by Vanilla`Goddess^_^ 1

A solution contains 65mg/ml of sodium pentobarbitol What volume of this drug would be appropiate to adminster to a 33 gram lab rat at a dose of 40mg/kg

2007-09-07 01:17:29 · 1 answers · asked by whisper2ya 2

NaHSO(sub)4 + Na(sub)2CO(sub)3

I guessed 2Na(sub)2SO(sub)4 along with CO(sub)2 and H2O

2007-09-06 19:07:57 · 1 answers · asked by Anonymous

2007-09-06 18:36:14 · 2 answers · asked by Anonymous

which one use higher speed of radiation, hand phone or microwave?
give the reason for your answer

2007-09-06 17:32:37 · 5 answers · asked by reayn 1

2007-09-06 16:47:19 · 6 answers · asked by Anonymous

How many square nanometers equals one square centimeter? How would you do this?

2007-09-06 16:38:43 · 2 answers · asked by Anonymous

2007-09-06 16:26:27 · 1 answers · asked by polkastripes 1

write the following half equations .
ethanol to acetic acid (oxidation) ---------- > (1)
oxygen to water (reduction)----------------->(2)

Add (1) and (2)
can you please teme the answers for the addition of both the equation and how to go about doing it.

thank you

2007-09-06 15:48:27 · 1 answers · asked by pups 3

Is there an easy way to calculate pH when given the M concentration of a compound as well as its amount in liters?

2007-09-06 15:24:12 · 2 answers · asked by Anonymous

i've got this AP chem lab due tomorrow morning and i have no clue on the answer to this question. Please can you help me out? I would really appreciate it...

The lab was about precipitating silver (which become silver chloride after a few procedures) from a dime while copper chloride is filtered out. The silver chloride is in a hot crucible and here's the question...

If the crucible containg the silver chloride is not cool whent he mass is determined, with the calculated percent silver be too high or too low? Why?

p.s. i know you may not have very much of a clue of what im talking about but can you please give me an idea of what you think..because i have no clue...thankyou sooooooooo much!

2007-09-06 15:13:28 · 2 answers · asked by howyoudoin' 1

Determine the density of a proton. For a sphere V = (4/3)\pi r^3.
The proton has a radius of approximately 1.0 times 10^{ - 13} cm and a mass of 1.7 times 10^{ - 24}g
PS: i need to know how to do it step by step so i understand it..not just the answer. thanks!

2007-09-06 14:07:48 · 2 answers · asked by B 2

2007-09-06 14:01:25 · 4 answers · asked by 22 4