Chemistry - June 2007

1. __BrO3- + __Sb3+ > __Br- + __Sb5+ (acidic solution)

2. __C2H4+ + __MnO4- > __CO2 + __Mn2+ (acidic solution)

3. __NaOH+ __Ca(OH)2 + __C + __ClO2 > __NaClO2 + __CaCO3 + __H2O

4. __CrO4^2- + __Cl- > __Cr^3 + __HClO2

2007-06-15 04:38:04 · 2 answers · asked by sammy g 1

Please don't spare on gross words i would like to know everything there is to burns.

2007-06-15 04:36:51 · 4 answers · asked by Christopher C. 1

I have an assignment, which is to design and plan an experiment to compare the reactivity of metals / halogens using salts of metals/ sodium halides. ( or any other suitable method ) Can anyone suggest a simple experiment with a rather simple setup? Kindly name all reagents and equipment used. :)Also, I need to describe what happens in each step of the experiment. Could anyone help me out?

PS: What are sodium halides? Just wondering.

Thanks!

2007-06-15 03:57:52 · 2 answers · asked by bashaprincess 2

2007-06-15 03:11:21 · 3 answers · asked by Amitabh S 3

2007-06-15 03:00:17 · 1 answers · asked by abc.....xyz 2

Why is water an excellent solvent for most ionic compounds, and polar-covalent molecules, but not for non-polar molecules?

What are two factors that affect the solubility of an ionic compound in water?

And why is a non-polar solute does not dissolve in a polar solvent?

Thanks in advance!

2007-06-15 02:58:40 · 2 answers · asked by Anonymous

2007-06-14 21:29:10 · 4 answers · asked by muttu swami 1

Is it used to monitor concentrations in the atmosphere?

I know it's used to monitor soil samples, but how?

And it's also used to monitor pollution in water and industrial waste, right? But HOW?

Any info would be much appreciated, of even (better maybe) a link to a webpage that can give me some into on AAS and pollution. I've been looking for hours and i can't find one.

Thanks in advance.

2007-06-14 21:15:45 · 2 answers · asked by Anonymous

2007-06-14 18:52:10 · 1 answers · asked by emikato_913 2

tv sets every so often in the 70's and phosphorous cloud from my fishtank

2007-06-14 18:03:25 · 4 answers · asked by rara 3

0.125g of a piece of impure magnesium ribbon is heated in air until there is no change in mass. 0.200g of magnesium oxide is obtained. What is the % purity of the magnesium?

2007-06-14 17:58:13 · 1 answers · asked by Stormy Knight 1

This was one of the questions from AP chem final exam in my class..

which of the following is not a Lewis base?

1. NH2 ( i can't remember the charge,,,)
2. NH3 (no charge)
3. NH4 (+)
4. Cl (-)

Lewis base, by definition, is a substance that can form cobalent bond by donating an electron pair to another substance.

2007-06-14 17:51:16 · 4 answers · asked by LOLA 2

this question is regarding acids bases and salts

2007-06-14 17:50:35 · 10 answers · asked by Anonymous

2007-06-14 17:13:19 · 2 answers · asked by Anonymous

How can you tell if something is matter or not

2007-06-14 16:17:04 · 7 answers · asked by lirael1019 1

2007-06-14 16:06:49 · 6 answers · asked by JOLLIVIE E 1

2007-06-14 15:39:10 · 3 answers · asked by iluvchristianity 2

How much heat energy was transfered from the hot water? How much from the cold?

2007-06-14 14:22:22 · 2 answers · asked by Answer Champion 3

2) Weak tea is an example of a
a.dilute solution
b.concentrated solution
c.suspension
d.solvent

2007-06-14 14:12:57 · 4 answers · asked by Answer Champion 3

1)56.4 mi to km and to Mm
2.0 L to qt and to fl oz
7 ft 2.0 in to cm and to m
1.35 lb to kg and to dg
2)A normal valuve for blood cholesterol is 200 mg/ dL. If a normal adult has a total blood volume of 5 L, how much total cholestrol is present?
3)Diethyl ether, a substance once used as a general anesthetic, has a specific heat of 0.895 cal/ (gx Celsius). How many calories and how many kilocalories of heat are needed to raise the temp. of 30.0 g of diethyl ether from 10.0 celsius to 30.0 celsius.
4) Aspirin has a density of 1.40 g/cm3(cubed). What is the volume in cubic centimeters of a tablet weighing 250 mg?
5)What is the density of rubbing alcohol in grams per milliliter if a 5.000 ml sample weighs 3.928 g at room temp? What is the specific gravity of rubbing alcohol?
6) What dosage in grams per kilogram of body weight does a 130 lb woman receive if she takes two 250 mg tablets of penicillin? HOw many 125mg tablets should a 40lb child take to recieve the same dosage?

2007-06-14 13:36:43 · 2 answers · asked by I-Love-the-Skin-Im-In 2

As the barium hydroxide solution is added to the solution of sulfuric acid, the electrical conductivity of the acid solution decreases because the:

-volume of the reaction mixture increases
-temperature of the reaction mixture decreases
-concentration of ions increases
-concentration of ions decreases

2007-06-14 12:30:39 · 3 answers · asked by Just a girl 2

Silver is widely used in jewellery and for tableware. Although the metal is highly resistant to oxidation by air at ordinary temperatures, it becomes tarnished when exposed to air containing small amounts of hydrogen sulphide. The tarnish is a layer of silver sulphide. The overall reaction is:

4 Ag + 2 H2S --> 2 Ag2S + 2 H2O

What mass of silver sulphide would form from the reaction of 0.015 g of silver?

Any help would be appreciated. Thanks.

2007-06-14 11:50:49 · 5 answers · asked by Anonymous

2007-06-14 11:03:49 · 1 answers · asked by lord_andys_new_id 1

2007-06-14 10:49:20 · 1 answers · asked by Monte 1

I'm so confused in Chemistry!!
Why is NaNO3 Sodium Nitrate if it has Sodium, Nitrogen, and Oxygen?? Ugh..
What would these be???
CoO
NH4F
LiBrO4
HNO2
N2O4

PLEASE HELPPP

2007-06-14 10:45:10 · 4 answers · asked by natalie b 3

2007-06-14 10:25:35 · 9 answers · asked by Monte 1

Are there any lethal poisons that
a) would kill about 24 or so hours after digestion
b) are soluable in water or alchohol without losing effect
c) cannot be detected using only the natural senses

I need this for a murder mystery that I'm working on. Thanks!

2007-06-14 08:32:29 · 3 answers · asked by Anonymous

I'm working on an invention, but it includes condensing water. Does anyone know how to turn water into a vapor???

2007-06-14 08:08:07 · 9 answers · asked by Muhnahmuhna! 6

Looking for a good answer

2007-06-14 07:58:23 · 2 answers · asked by Anonymous

Is it possible for just a regular person to be able to buy dry ice?

2007-06-14 06:40:48 · 15 answers · asked by Anonymous