Chemistry - December 2007

I'm researching the heats of combustion for different fuels, and I need to test this with a bomb calorimeter. Where can I find one to use? Is it possible to build a simple one?

2007-12-17 14:10:05 · 1 answers · asked by Zeuski 1

3 moles of ammonium phosphate is how many grams?

2007-12-17 13:54:53 · 12 answers · asked by Anonymous

Is Magnesium lusterous?

2007-12-17 13:34:08 · 1 answers · asked by Anonymous

2007-12-17 13:28:52 · 2 answers · asked by Anonymous

1. neutral
2. weakly basic
3. strongly basic
4. weakly acidic
5. strongly acidic

2007-12-17 12:59:29 · 12 answers · asked by Anonymous

e.g. period 2

2007-12-17 12:58:00 · 5 answers · asked by THFNB F 1

Teacher gave us these problems and I really! need help with them. I need an answer and how to solve it!!! Thank you and most detailed answer gets best answer tonight!!


4. At zero degrees Celcius the enthalpy of the melting of water is 6.0 kJ times mol to the -1 power. The enthalpy change when 36 grams of water freezes is...?


5. At 100 degrees Celcius the enthalpy of the vaporization of water is 40.7 kJ times mol to the -1 power. The enthalpy change when 36.0 grams of water vapor condenses is...?


6. A 300mL sample of hydrogen chloride at 690 Torr and 20 degrees Celcius is dissolved in 100mL of water. The solution was titrated to the stoichiometric point with 24.8 mL of a sodium hydroxide solution. What is the molar concentration of the NaOH in solution?

2007-12-17 12:50:42 · 1 answers · asked by macbethbro19 1

Hi today we did the lab and the isopropanol density we've calculated was 1.3g/mL

is this possible cuz this number is lyk way too off

2007-12-17 12:49:22 · 4 answers · asked by Anonymous

i need to know this because i got a big chem test coming up and i have not payed attenion in chem =/

2007-12-17 12:33:29 · 10 answers · asked by Dave 1

2007-12-17 12:06:35 · 2 answers · asked by Anonymous

It's related to chemistry & boiling points if that helps....

2007-12-17 12:05:39 · 3 answers · asked by tesia g 1

A) a small magnitude of the lattice energy of the solute
B) a large polarity of the solvent
C) a large magnitude of the solvation energy of the ions
D) all of the above
E) none of the above

2007-12-17 11:57:10 · 1 answers · asked by Patrick R 1

NH4+ + CN- --> NH3 + HCN
are respectively, ____.
1. NH4+ and NH3
2. NH4+ and HCN
3. NH3 and CN-
4. CN- and HCN
5. NH4+ and CN-

2007-12-17 11:24:52 · 1 answers · asked by Anonymous

1. CN-
2. HS-
3. HC2H3o
4. H2CO3
5. HF

2007-12-17 11:18:23 · 1 answers · asked by Anonymous

(blank) is the most common metal in the Earth's crust.

A. Alluminum
B. Iron
C. Copper

AWNSER FAST!

2007-12-17 10:16:57 · 4 answers · asked by Anonymous

2007-12-17 10:12:10 · 2 answers · asked by abdullah e 1

Thx for help.

2007-12-17 10:05:38 · 1 answers · asked by Lokc 1

decomposition of ammonia on tungsten,

NH3 -> 1/2 N2 + 3/2 H2

where the rate constant is 2.08 x 10^-4 mol/L*s


I would appreciate any help with understanding this question, I am basically an idiot when it comes to higher level chemistry problems so I can't understand complex formulas without all the variables explained...

2007-12-17 10:00:54 · 2 answers · asked by Rettie 2

2007-12-17 09:55:08 · 2 answers · asked by juliaaa.<3 1

2007-12-17 09:54:06 · 2 answers · asked by Anonymous

can someone explain to me the bonding between a Cu+2 ion and 20 moles of H2O?

2007-12-17 09:47:48 · 1 answers · asked by Anonymous

My chemistry teacher had to leave for a few weeks while her husband is having back surgery. She left my class notes and an assignment. She gave 10 people in my class a section of the current chapter to present/teach to the class. My section deals with Hess's law and enthalpy. I read the chapter, the notes, and the definitions, so I do not need those to be repeated. I need someone to please explain to me what enthalpy and Hess's law are, essentially. I kind of understand it, but not well enough to present. If someone could help I would be extremely greatful. Thanks!

2007-12-17 09:30:27 · 3 answers · asked by black_star_47001 3

what are some of the uses for of copper.does it combine with other elements. what are they.

2007-12-17 09:28:18 · 4 answers · asked by jam4u06 2

does anyone know what are some common elements found at home? thx

2007-12-17 09:25:16 · 1 answers · asked by Taylor 1

1) Which of the following is the correct name for the acid HCN ?

a) cyanic acid
b) cyanous acid
c) hydrocyanous acid
d) hydrocyanic acid

2) If an acid does not contain oxygen, the name of the acid begins with which of the following prefixes?

a) anoxy-
b) peroxy-
c) hydro-
d) mono-


3) What is the name and formula for the anion corresponding to sulfuric acid, H2SO4?

a) SO4-, sulfate ion.
b) SO32-, sulfite ion.
c) SO32-, sulfate ion.
d) SO42-, sulfate ion.

4) The carbonate ion is CO32-. Which of the following is carbonic acid?

a) HCO3
b) H2CO3
c) H(CO3)2
d) HClO3

5) What is the name of the acid with the formula H3PO4?

a) perphosphoric acid
b) phosphoric acid
c) phosphorous acid
d) hypophosphorous acid

6) What is the name of the acid with the formula H3PO3?

a) perphosphoric acid
b) phosphoric acid
c) phosphorous acid
d) hypophosphorous acid

2007-12-17 09:08:54 · 4 answers · asked by :: 561 :: 1

2007-12-17 08:41:33 · 3 answers · asked by sherryyyyyy .A. 1

fridge is to cafeteria as A cell is to a nucleus. HOW?

2007-12-17 08:28:58 · 3 answers · asked by Jo M 1

i need so solid info on the mettal copper. not where to get them.if you have good sights then can you give the site please

2007-12-17 08:25:55 · 4 answers · asked by jam4u06 2

not the latin word hydrargyrum but the word "mercury" itself

2007-12-17 08:25:50 · 4 answers · asked by ooh-taay 2

2007-12-17 08:18:51 · 2 answers · asked by Anonymous