Chemistry - July 2007

2007-07-28 04:33:08 · 6 answers · asked by Namrata C 1

Can anyone tell me what a scoville unit is and what does it measure?

2007-07-28 04:23:33 · 6 answers · asked by andrew j 1

water displacement or geometric means?

2007-07-28 03:43:59 · 3 answers · asked by x_lololol 2

this is a question ask by my lecturer during class. it certainly not the matter of singular and plural.

2007-07-28 03:40:31 · 4 answers · asked by jitterbugs 1

What is a simple chemical test to distinguish between ammonia solution and ammonium bromide solution?
Please give any equations as well if you can.
Thankyou.

2007-07-28 02:37:20 · 2 answers · asked by Questioner 1

Hey,
Can anyone give me balanced equations for these:
1.)Neutralization of solid nickel (ii) oxide by dilute nitric acid, producing a green aqueous solution
2.) Thermal decomposition of sodium nitrate crystals producing a colourless gas and white residue.
3.) Conversion of ammonia to nitrogen by passing the gas over heated copper(ii) oxide powder.
Thankyou

2007-07-28 01:06:10 · 2 answers · asked by Questioner 1

2007-07-27 22:53:00 · 4 answers · asked by Anonymous

2007-07-27 20:51:34 · 19 answers · asked by Anonymous

(continue from the question) not uncharged molecules, as a result of the reaction between the acid molecules and water molecules?

2007-07-27 18:46:55 · 2 answers · asked by Anonymous

2007-07-27 18:41:04 · 11 answers · asked by John 2

is arrangement of water bent(V-shaped)
but then ice is arranged in a tetrahedral structure?
so are their structure different in this sense

2007-07-27 18:38:12 · 1 answers · asked by Anonymous

2007-07-27 18:36:51 · 5 answers · asked by Woan 2

this is the chemical formula they gave me...
2 H 2 + O 2 ----> 2 H 2

2007-07-27 18:26:09 · 7 answers · asked by Anonymous

I've been asked to determine the polymer of the 20th century for chemistry. I've come up with a few candidates (but I won't put them here to sway anyone's answer), however I'd like to know what other people (especially from from different backgrounds think.

2007-07-27 18:17:01 · 6 answers · asked by Anonymous

This gas emits from every motor vehicle on earth and all we hear about is carbon dioxide (CO2).
Does the CO evolve into CO2 ?

2007-07-27 15:26:42 · 5 answers · asked by pigspadoonki 2

1) What is produced at the cathode during the electrolysis of aqueous NaBr?
a) Na(s)
b) Br2(l)
c) H2(g)
d) O2(g)

2)What is produced at the anode during the electrolysis of aqueous NaBr?
a) Na(s)
b) Br2(l)
c) H2(g)
d) O2(g)

2007-07-27 14:44:31 · 3 answers · asked by Anonymous

Obviously, its one hydrogen, one oxygen.
What are HO water's characteristics, where does it occur, how was it discovered, is it drinkable......

2007-07-27 14:01:22 · 9 answers · asked by Anonymous

2007-07-27 12:38:05 · 9 answers · asked by Jared 1

How would you make a FUNCTIONAL thermomter which works in a temperature range of about 10-80 degrees Celsius.

2007-07-27 12:21:46 · 3 answers · asked by Sum1 2

Ka=1.7*10^-1

Answer choices:
a) 94.6%
b) 55.2%**correct
c) 27.1%
d) 18.7%

I couldn't get it to work out to that percent. Thanks in advance for any help.

2007-07-27 10:55:26 · 2 answers · asked by triciawin87 2

There's oxygen in water, so why doesn't fire burn in it?

2007-07-27 10:48:59 · 9 answers · asked by anydenney 2

Ions and Ionic Compounds. (Question 8.46)

Use the following data to estimate ΔH°f for magnesium fluoride.

Mg(s) + F2(g) MgF2(s)

Lattice Energy -3916 kJ/mol
First ionization energy of Mg 735 kJ/mol
Second ionization energy of Mg 1445 kJ/mol
Electron affinity of F -328 kJ/mol
Bond energy of F2 154 kJ/mol
Enthalpy of sublimation of Mg 150. kJ/mol

ΔH°f =_______kJ/mol

2007-07-27 10:40:44 · 1 answers · asked by Anonymous

please can anyone write a detailed description of a sodium bicarbonate tablet added to a glass of water?

2007-07-27 09:50:49 · 3 answers · asked by princess 2

Okay, I have this problem and I can't figure it out!
What is the freezing point of a solution of 84.1 g of sodium chloride dissolved in 1000 g of water? The answer is -5.35 deg. I just dont know how to get the answer...thanks!

2007-07-27 08:49:10 · 3 answers · asked by Jay Jay 1

2007-07-27 07:52:31 · 4 answers · asked by Anonymous

2007-07-27 07:32:36 · 2 answers · asked by namso141 3

2007-07-27 06:43:29 · 4 answers · asked by maxine e 1

2007-07-27 05:34:29 · 3 answers · asked by Anonymous

Question 1:
Acid solutions have a _______ taste.


Question 2:
Acid solutions cause reddish-purple phenolphthalein to become _________.


Question 3:
To produce a given acid, react sulfuric acid with the _____ of the acid desired.


Question 4:
Sulfuric acid is used to prepare other acids because it is stable and has a _____ boiling point.


Question 5:
An oxide which dissolves in water to form an acid or base is called a(n) ____________.


Question 6:
A base is also known as a proton __________.


Question 7:
A base consists of a metallic element or radical combined with one or more _________ radical.


Question 8:
Basic solutions have a _______ taste and a soapy feeling.


Question 9:
A base may be produced by reacting a salt of the desired base with ________.(Write out the compound name.)


Question 10:
A substance which shows the presence of an acid or base by changing color is called a(n) _____________.

2007-07-27 05:32:41 · 5 answers · asked by alex h 3

In the world's oceans, the average NaCl concentration is about 0.51 M. How many grams of NaCl would be in 1.0 liter of sea water?

2007-07-27 05:19:03 · 5 answers · asked by cbrice9 1