Chemistry - January 2007

A 250 ml sample of oxygen is collected over water at 25degrees celcius and 760 torr pressure. What is the pressure of the dry gas alone? (Vapor pressure of water at 25 =23.8 torr)

Well this is the problem. What do I do to solve this exactly?

2007-01-03 13:42:27 · 2 answers · asked by epooji 3

Covalent or ionic

and are electrons shared of trasferred?

2007-01-03 13:42:06 · 3 answers · asked by Anonymous

ok so... this is the actual question from my book:
Look at the chemical formulas for vinegar(HC2H3O2) and ammonia(NH4OH). What part of each formula identifies each substance as an acid or base?
acid: base:

ok thanx
love to all
k

2007-01-03 13:39:30 · 3 answers · asked by cowboizgrl 1

Permanganate ion, ( MnO 4) - oxidizes SULFITE ions to SULFATE ion. The manganese (Mn) product depends on the pH of the reaction mixture. The mole ratio of oxidizing to reducing agent is 2 to 5 at pH 1 amd jas a ratop pf 2 to 1 at pH 13. For each of these cases please explain and write the balanced equation for that rxn. and indicate the oxidation states.


THANKS FOR YOUR HELP to THOSE WHO HELP
best answer will probably be chosen tomorrow

thank you

2007-01-03 13:38:50 · 1 answers · asked by chanti 3

a) Ba & I
b) Br & CI
c) Li & I
d) K & CL

2007-01-03 13:38:34 · 2 answers · asked by Anonymous

Hydrochloric acid (HCl) and sodium hydrogen sulfite
HCl and Copper (II) sulfate
sodium hydroxide and potassium chromate
potassium chromate and calcium chloride
" " and sodium hydrogen sulfite
" " and copper (II) sulfate
calcium chloride and sodium hydrogen sulfite
" " and copper (II) sulfate
sodium hydrogen sulfite and copper (II) sulfate

2007-01-03 13:36:31 · 2 answers · asked by googlybear 2

2007-01-03 13:32:51 · 4 answers · asked by jessica 1

IDENTIFY A CHEMICAL SPECIES:: that is

a) capable of oxidizing Cl - under standard conditions.
and
b) capable of reducing Cl - under standard conditions.

2007-01-03 13:31:50 · 2 answers · asked by chanti 3

which of the following phrases best described the bond between these elements?

mostly covalent/ionic in character and formed between a meet and one/two nonmetals

2007-01-03 13:26:29 · 3 answers · asked by Anonymous

How many moles is 1.50 x 10^23 molecules NH( subscript )3.

2007-01-03 13:23:57 · 3 answers · asked by Anonymous

a. density
b. atomic radius
c. melting point

2007-01-03 13:20:02 · 1 answers · asked by killsyche 3

whats the difference between cast acrylic tube,and perspex tube.

2007-01-03 13:05:52 · 2 answers · asked by tugboat 4

When heated, aqueous silver chlorate, AgClO3, produces solid AgCl, and O2. How do i know if this is endothermic or exothermic? Which one is it and how do i tell?

2007-01-03 13:04:40 · 5 answers · asked by -__ 3

It has puzzled me for a while. How can someone simply be consumed by flames with no apparent source that would cause a fire? I'd like to hear what you think causes this phenomenon.

2007-01-03 12:51:36 · 4 answers · asked by Hannah 1

ok~ helium~ it is located in the top, right hand corner of the periodic table, but why? any particular reason?
also, who discovered helium? i have researched it but i have come up with MANY different answers, so which is right???
also, where can i find a write up on ht ehistory of helium??

THANKS!

2007-01-03 12:47:36 · 7 answers · asked by Anonymous

I did a science project where i mixed two chemicals and had to wait for them to change color. Each time i shook it up faster. However, the shaking didnt affect the time it took for the chemical reaction to take place. Any ideas why?

2007-01-03 12:46:38 · 4 answers · asked by Kaitlyn 2

how would you test for O2 and CO2 gas? (what type of reaction would prove its existence?)

2007-01-03 12:43:23 · 3 answers · asked by cherriecheezecake 1

2007-01-03 12:36:38 · 3 answers · asked by Rosy 2

I need help setting up these problems:

For 7 x 10^33 atoms of Al, how many grams are present?

For 235.1 grams of sodium hydroxide, how many formula units are present?

What is the mass (in amu or in grams) of 5 molecules of carbon dioxide?

Thanks for the help!!

2007-01-03 12:20:32 · 4 answers · asked by Mia16 3

1) K2Cr2O7 + HCl >>>> KCl + CrCl3 + Cl2 + H2O

2) Bi2S3 + HNO3 >>>> Bi (NO3)3 + NO + S + H2O

3) HgS + HCl + HNO3 >>>> HgCl2 + NO + S + H2O

2007-01-03 12:18:00 · 2 answers · asked by truckin_90 2

where does it come from

2007-01-03 12:17:26 · 9 answers · asked by ra ra ra ra ra 1

Anyone know how to write the net ionic equation for:

-Solid lithum oxide is added to distilled water
-Solutions of potassium hydroxide and propanoic acid are mixed.

2007-01-03 12:01:37 · 1 answers · asked by rachel 1

2007-01-03 11:57:58 · 18 answers · asked by ???????????????? 1

2007-01-03 11:49:37 · 3 answers · asked by Anonymous

This is for biochemistry

2007-01-03 11:47:30 · 1 answers · asked by clarisseimperial 1

How much heat will be transferred when 0.54 mol sulfur reacts with 0.75 mol oxygen according to the following equation?

2S(s) + 3O2(g) -->2SO3(g)
enthalpy change=-790kJ

How do you calculate when there are no grams given to you? Do you use sulfur or oxygen?

2007-01-03 11:37:29 · 1 answers · asked by Anonymous

i have a quiz tommarrow on this material....a sample question is name this type 2 ionic compound...the first one is, " CuCl(2) " and the answer is, "copper II chloride". the teacher told me this answer which is how i know it. the next one is, " Fe(2)S(3) " and i dont know the answer, im not interested in the answer but more how to do these problems, i understand how to get the "copper chloride" part but not the "II" part, how do you determine the value of the roman numeral

2007-01-03 11:29:00 · 5 answers · asked by Anonymous

2007-01-03 11:20:53 · 2 answers · asked by Dan 1

As in the NaOH leaked into a large body of water

Its for a summative project and I cant seem to find an answer to it anywere.

2007-01-03 11:20:13 · 3 answers · asked by Anonymous

why do equations need to be balanced?
what is the law of conservation of matter?

2007-01-03 11:14:24 · 6 answers · asked by Dan 1