Chemistry - January 2007

2007-01-12 05:20:40 · 5 answers · asked by Anonymous

1. What happens to a filled balloon when the temperature remains constant and the air pressure in a room drops?

2. Define IDEAL GAS

3. Define PARTIAL PRESSURE

2007-01-12 05:00:42 · 7 answers · asked by Angel Eve 6

I have a project in my chemistry class were i have to build a working model of a hot air balloon. Please i need designs, ideas, and materials i can use. If you can also provide me with some of the calculations used in making and flying a hot Air Ballon . I would really appreciate an answer. Who ever answers the best gets the ten points!

2007-01-12 04:52:50 · 1 answers · asked by masry 2

When will the conjugate addition take place(1,4 addition) and when is the 1,2 addition?
How to know?

2007-01-12 04:36:31 · 2 answers · asked by Norman Arthrun 1

diamond is hard and has a high melting point ?????

2007-01-12 04:36:29 · 2 answers · asked by Hally berry 3

determine whether a solid substance contains ionic bonds ?????

2007-01-12 04:35:31 · 2 answers · asked by Hally berry 3

1. How many grams of sodium chloride are required to react with 196 grams of H2SO4?

2. How many grams of hydrogen are produced by the action of hydrochloric acid on 50 grams of zinc?

3. How many grams of copper oxide may be reduced by 10 grams of hydrogen?


Can you hlep me to understand how to do this?
point me in the direction of getting some help?
or show me how to figure out the answer.

2007-01-12 03:48:13 · 4 answers · asked by Amber Elizabeth 1

the lewis dot diagram or shape of this element

2007-01-12 03:47:02 · 2 answers · asked by neto_jojo 1

2007-01-12 03:44:23 · 5 answers · asked by Anonymous

i m reffering to chemical kinetics

2007-01-12 02:59:16 · 1 answers · asked by abc x 1

can someone tell me how this one works..
if for example I was given 5 elements and I have to know what element has the greatest electron affinity, metallic property.. ect..

2007-01-12 02:31:09 · 2 answers · asked by blue_skies 2

2007-01-12 02:17:32 · 4 answers · asked by subir pal 1

Something related to properties of metals and alloys.

2007-01-12 02:03:43 · 6 answers · asked by Anonymous

thanking u all

2007-01-12 01:56:39 · 2 answers · asked by Anonymous

A dilute solution of NaOH or a concentrated solution of HC2H3O2? Explain your answer.

2007-01-12 01:40:06 · 3 answers · asked by help 1

Three volatile compounds X, Y, and Z each contain element Q. The percent by weight of element Q in each compound was determined. Some of the data obtained are given below.

Compound---Percent by Weight of Element Q---Molecular Weight
X ----------- 64.8% ---------------------- ?
Y ------------ 73.0% ----------------------- 104.
Z --------------- 59.3% ---------------------- 64.0

(a) The vapor density of compound X at 27 degrees Celsius and 750. mm Hg was determined to be 3.53 grams per liter. Calculate the molecular weight of compound X.

(b) Determine the mass of element Q contained in 1.00 mole of each of the three compounds.

(c) Calculate the most probable value of the atomic weight of element Q.

2007-01-12 00:16:01 · 1 answers · asked by bosox1989 1

Use principles of atomic structure and/or chemical bonding to answer each of the following.

(a) The radius of the Ca atom is 0.197 nanometer; the radius of the Ca2+ ion is 0.099 nanometer. Account for this difference.

(b) The lattice energy of CaO(s) is -3,460 kilojoules per mole; the lattice energy for K2O(s) is -2,240 kilojoules per mole. Account for this difference.


Ionization Energy (kJ/mol)
First Second
K 419 3,050
Ca 590 1,140



(c) Explain the difference between Ca and K in regard to

a. their first ionization energies,

b. their second ionization energies.

(d) The first ionization energy of Mg is 738 kilojoules per mole and that of Al is 578 kilojoules per mole. Account for this difference.

2007-01-12 00:12:50 · 3 answers · asked by bosox1989 1

what conditions are neccesary for substances to be separated by chromatography?
why might different solvents be used in chromatography?

2007-01-12 00:01:02 · 5 answers · asked by okiron 1

Which of the following groups does not contain an ionic compound?
a-HCN,NO2,CA(NO3)2
b-KOH,CCL4,SF4
c-CH2O,H2S,NH3

2007-01-11 23:58:11 · 2 answers · asked by Anonymous

2007-01-11 23:49:56 · 4 answers · asked by okiron 1

2007-01-11 23:04:01 · 7 answers · asked by sayan 1

1.) Sn(C2O4)2

2.) Al2 (ZnO2)3

3.) HCN

4.) (NH4)2B4O4

5.) Ti(SO3)2

*assuming that all the numerical values there are subscripts...

thank you...

2007-01-11 22:53:15 · 3 answers · asked by Anonymous

2007-01-11 22:18:39 · 8 answers · asked by ash 1

Softening plant of capacity 100gpm is used to feed water to steam generators. The Mg hardness need to be brought down below 1 ppm. The potable water is fed to softeners. At present 225 Na (Ion Excahange) resin is being used.

2007-01-11 22:01:23 · 4 answers · asked by Rajes 2

2007-01-11 21:45:23 · 2 answers · asked by dinu 1

If you took one part liquid hydrogen and mixed it with two parts of liquid oxygen, would you get some bizarre liquid water? Why or why not?

2007-01-11 21:24:00 · 5 answers · asked by georgd58 2

would this be q=Hv or q=m*c*delta T?

2007-01-11 20:12:48 · 4 answers · asked by cc 2

--P4 + HNO3 + H2O -> H3PO4 + NO
--KMnO4 + H2SO3 -> K2SO4 + MnSO4 + H2SO4 + H2O
--Zn + HNO3 -> Zn(NO3)2 + NH4NO3 + H2O
--Cu + HNO3 -> Cu(NO3)2 + H2O + NO
--FeSO4 + K2Cr2O7 + H2SO4 -> Fe2(SO4)3 + Cr2(SO4)3 + K2SO4 + H2O

2007-01-11 19:42:32 · 2 answers · asked by Anonymous

Does it have anything to do with reversible and irreversible changes?

2007-01-11 18:44:36 · 9 answers · asked by Honey Badger 1

2007-01-11 17:49:09 · 7 answers · asked by Anonymous