Chemistry - February 2007

help??

2007-02-04 05:21:24 · 6 answers · asked by Xx_Booty_Shakin_Cheerleader_xX 1

2007-02-04 05:03:45 · 7 answers · asked by Gunner 1

Okay, my mom is in Pharmasudicals in college and me and her have tried the last 30 minutes tring to get this problem figured out!! Can anyone help us & explain how you the answer???

2007-02-04 04:57:49 · 4 answers · asked by Xx_Booty_Shakin_Cheerleader_xX 1

a)A particular oral contraceptive contains 0.038 mg of ethinyl estradiol in each pill. The formula of this compound is C20H24O2. How many moles of ethinyl estradiol are there in one pill?

I got tjis first part, the answer is 1.282e-07 mol


b)How many hydrogen atoms are there in one of these pills (due to the presence of ethinyl estradiol)?



c)What mass of hydrogen is this?


I can't figure out how to solve the rest

2007-02-04 04:52:04 · 2 answers · asked by bollocks 2

2007-02-04 04:22:34 · 3 answers · asked by mint 2

2007-02-04 04:09:50 · 10 answers · asked by buzzy 2

i really don;t get this... what happens when you inhail Helium ?

2007-02-04 03:58:29 · 7 answers · asked by Anonymous

How rare or abundant is lead?

2007-02-04 03:04:58 · 6 answers · asked by ♥Roberta. 5

2007-02-04 02:59:50 · 3 answers · asked by Mary L 1

For the following reaction the below data were measured.


2NO(g) + 2H2 (g) -----> N2 (g) + 2H2Og

Initial Concentrations (mol/L)
[NO] [H2]
0.10 0.10
0.10 0.20
0.20 0.10

Initital Rate of Formation of H2O (mol/Ls)
0.00123
0.00246
0.00492


What is the rate constant k for this reaction ?

2007-02-04 02:47:32 · 3 answers · asked by Anonymous

Is there such gas that explodes or cathes fire with air? I know that acetylene explodes when highly pressurised

2007-02-04 02:42:09 · 7 answers · asked by Vincent P 1

I mean, high school chemistry lab has all kinds of experiments to turn compounds into other compounds. Can this be done on a global scale to reduce CO2 levels? It sounds too obvious, so what are the complications?

2007-02-04 02:29:12 · 4 answers · asked by Anonymous

2007-02-04 02:26:31 · 3 answers · asked by Anonymous

remember kilo means 1000, try to explain the answer in detail

2007-02-04 01:34:03 · 3 answers · asked by tiffany l 1

i want to know th amont of water and the other constituent, answer fast.

2007-02-04 01:11:21 · 3 answers · asked by Anonymous

ty

2007-02-04 00:38:32 · 4 answers · asked by Anonymous

how do you know that salt is a good conductor (heat and electricity) and why!

2007-02-04 00:31:31 · 3 answers · asked by blubbablub 1

2007-02-03 23:47:17 · 4 answers · asked by blubbablub 1

2007-02-03 23:03:42 · 2 answers · asked by Yuvraj K 1

2007-02-03 22:52:31 · 5 answers · asked by Anonymous

2007-02-03 22:46:56 · 4 answers · asked by Yuvraj K 1

Why is this so?

2007-02-03 22:40:02 · 3 answers · asked by Anonymous

The reaction

2NO2 >< N2O4
brown colourless


The reaction is at equilibrium..if we were to reduce the volume (ie increase the pressure), what colour would the mixture be BEFORE equilibrium is re-established?

2007-02-03 21:59:28 · 2 answers · asked by castaway1029384 1

- Transparent under visible light
- Can phosphor any colour
- Preferably a liquid, that can be put in a felt tip pen
- Over the counter ingredients would be best.
- Already tried washing powder

2007-02-03 21:48:25 · 2 answers · asked by nerd608 1

I need help on what does it stand for, what's the explanation behind it.Thanks

2007-02-03 21:24:53 · 9 answers · asked by Anonymous

Like is it manufacture, retail or design, I really need help on this, thanks.

2007-02-03 21:19:37 · 3 answers · asked by Anonymous

2007-02-03 21:15:04 · 3 answers · asked by Chriss T 2

2007-02-03 20:37:01 · 2 answers · asked by bea 2

show the formula

2007-02-03 20:35:14 · 4 answers · asked by hazz r. 1

to have a fascination with candles. All day i have been burning candles, melting wax with fire, playing with wax, and all that fun stuff. Is that normal?

and how do you extinguish a candle flame with your fingers?

2007-02-03 20:12:04 · 6 answers · asked by Stephanie C 2