Chemistry - January 2007

how many moles are there in a 0.45 % NaCl solution?

2007-01-21 08:50:23 · 2 answers · asked by ABC 4

What about pm to cm?
mm Hg to atmosphere?
L to cubic meters?
Pa to atmospheres?
K to milliamperes?

2007-01-21 08:21:40 · 6 answers · asked by babyrooster 2

2007-01-21 08:18:16 · 11 answers · asked by miznercody 1

please tell me in words anyone can understand

2007-01-21 07:38:03 · 3 answers · asked by Anonymous

2007-01-21 07:25:26 · 4 answers · asked by Anonymous

Does the bonding of OH- increase or decrease pH? If it decreases pH, that would mean OH- and H+ lose their pH influence when bonded to an element of molecule, and that pH is really a matter of free floating OH- and K+ -doesn't it?

2007-01-21 07:22:27 · 2 answers · asked by Lisa 1

I have this worksheet that's supposed to help, but it doesn't. One of the questions says: How many grams of aqueous iron(II) bromide will be needed to react with an excess of potassium phosphate, K3PO4, to produce 17.1 grams of solid iron(II) phosphate? I know you have to set up the equation and balance it. I don't know if this is right, but i wrote: FeBr2+K3PO4>Fe(PO4)2 so could someone please try to help me with the rest of the problem and help with my formula because I don't think it's right :(

2007-01-21 07:19:39 · 3 answers · asked by oliverwoodfan91 1

are there any sample questions for the chemistry olympiad? I'm taking part in this year olympiad, but i dont know wot to expect on the exam papers...are they multiple-choice questions or essay type? what kind of topics do they cover? were can i find more info? thanks to all of u who reply!! :-)

2007-01-21 07:18:41 · 2 answers · asked by Unhappy Penguin :( 1

2007-01-21 07:12:19 · 5 answers · asked by Lisa 1

mass in grams of 3.52 mol of chromium(III) sulfate decahydrate

could you please explain it step by step

2007-01-21 07:01:42 · 2 answers · asked by stardust6547 2

1.H2NCH(CH3)NHC(O)NHC(O)OH
2.H2NNHC(O)(CH3)C(O)OH
3.H2NCHCHOCONH2
4.H2NCH2C(O)NHCH(CH3)C(O)OH
Question:

Correct di-peptide structure?

2007-01-21 06:40:27 · 1 answers · asked by aaachooooo 1

2007-01-21 06:34:24 · 5 answers · asked by Anonymous

In a double-replacement reaction, hydrogen chloride and sodium hydroxide react tp produce sodium chloride. Another product is...?

2007-01-21 06:14:59 · 6 answers · asked by Allahu_Akbar 3

The idea is that if you splash gasoline into your eyes, you use the milk (preferably whole milk) to wash the gasoline away. I'm wondering if anyone knows if this is true. Also, what is the chemical basis for this advice?

2007-01-21 05:56:56 · 1 answers · asked by Brian W 2

2007-01-21 05:53:56 · 13 answers · asked by Arsenal rule 1

I have searched and found nothing! anybody who knows, please help!

2007-01-21 05:53:00 · 1 answers · asked by melomane 4

2007-01-21 05:44:05 · 2 answers · asked by Mandy 1

2007-01-21 04:48:42 · 7 answers · asked by treesap7h 2

HOCN (exists as NO-CN)

thanks!

2007-01-21 03:58:06 · 3 answers · asked by sandcastlesinair 1

~Can you please explain the differences between lanthanides and actinides?

Can you please list the following uses for the following elements?
~ Boron-
~Carbon-
~Aluminum-
~Lead-
~Phosphorus-
~Nitrogen-
~Oxygen-
~Sulfur-
~Selenium-

2007-01-21 03:56:52 · 3 answers · asked by Miss Universe 2

Can vinegar and baking soda clean a seashell or will it just deteriorize it?

2007-01-21 03:56:43 · 4 answers · asked by Melly Girl 1

please try answering.

2007-01-21 03:49:26 · 1 answers · asked by puppy1 3

CaCO3(s)+energy<->CaO(s)+CO2(g)
What direction would the equilibrium shift if CO2 is removed from the container?

2007-01-21 03:41:07 · 2 answers · asked by S 3

A gas exerts a pressure of 0.5 atm at a temperature of 45 °C. What does the pressure become if the temperature is reduced to 25 °C? The volume remains constant throughout.

2007-01-21 03:30:32 · 3 answers · asked by Anonymous

1. how much energy must a mole of hydrogen atoms absorb if the electrons are to be excited from the first level to the fifth level?

2. what is wrong with the following descriptions of an orbital?

a. an orbital is a sphere of uniform density.
b. an orbital is a fixed path, like the fixed path of a planet circling the sun.
c. an orbital tells you exactly where an electron can be found.
d. an orbital can accommodate only one electron.

2007-01-21 03:23:37 · 5 answers · asked by Anonymous

what are the materials "Barbecue Lighting Cubes" made of ???

2007-01-21 03:23:25 · 1 answers · asked by Lava 2

help i dont have a clue doing buttercups course
dispensing technican.

2007-01-21 03:09:52 · 10 answers · asked by liam1967@btinternet.com 1

What are the differences between the bromination reaction of benzene, toluene and cyclohexane?

2007-01-21 03:00:36 · 3 answers · asked by athame 3

How is the reaction between baking soda and vinegar relevent to real life or the human body?

2007-01-21 02:54:05 · 4 answers · asked by Melly Girl 1

2007-01-21 02:49:27 · 7 answers · asked by Anonymous