Chemistry - October 2006

2006-10-30 06:47:50 · 21 answers · asked by Anonymous

A.antimony
B.silver
C.Tungsten
D.Chromium

2006-10-30 06:45:58 · 9 answers · asked by BrandyWhite 1

Chemistry

2006-10-30 06:16:41 · 1 answers · asked by cindyjun2000 1

determine the number of water molecules necessary to balance the reduction half reaction of _____MnO4- --> MnO2 that occurs in acidic slotuion

1. 2
2. 4
3. 5
4. 7

2006-10-30 06:09:46 · 3 answers · asked by Shawn 1

what is the mass percent of Fe3+ in the sample of a .6450g of iron ore requires 22.40mL of .1000M Sn2+ to completely react with the Fe3+ content of the ore?
1. 19.40%
2. 25.02%
3. 38.79%
4. 77.59%

2006-10-30 06:03:01 · 2 answers · asked by Shawn 1

1.hydroquinone
2. sodium succinate
3. sodium citrate

2006-10-30 06:00:30 · 3 answers · asked by speedacross1 2

Expain the direction in which the retention time would change for a substance in a GC experiment when the experimental parameters as changed as shown below.
a). column temperature decreased.
b). carrier gas flow rate increased
c). concentration of stationary phase liquid increased
d). detector temperature increased 10 degrees C
e). amount of sample injected decreased 20%

2006-10-30 05:54:45 · 2 answers · asked by kelxcore09 1

2006-10-30 05:53:27 · 6 answers · asked by Anonymous

one mole of oxalic acid(h2c2o4) is equivalent to ___moles of permanganate(MnO4)
1. 1
2. 2
3. 2/5
4. 5/2

2006-10-30 05:50:13 · 4 answers · asked by Shawn 1

The stationary phase in gas chromatography of organic molecules in normaly classified as a liquid phase. However, if we remove the packing material from one of our GC columns, it would come out of the column looking like very finely divided sand. Why?

ughhh I can't seem to find this anywhere. Thanks for any help.

2006-10-30 05:39:10 · 1 answers · asked by kelxcore09 1

In order to determine if a reaction is exothermic or not, you can measure the temperature around the system. If the system is colder then it released energy meaning it is exothermic and if not then it is endothermic. Correct?

2006-10-30 05:24:34 · 5 answers · asked by geniusflightnurse 4

A. Crookes tube
B. ion
C. isotopes
D. fluorine
E. helium
F. energy level
G. neutron
H. Rutherford
I. Mendeleev
J. valence number
K. covalence
L. Bohr
M. proton
N. Moseley
O. atomic number
P. electron

2006-10-30 05:13:15 · 3 answers · asked by tom y 1

2006-10-30 04:06:20 · 4 answers · asked by veronica r 1

2006-10-30 03:31:37 · 20 answers · asked by Anonymous

2006-10-30 03:17:47 · 3 answers · asked by oswald 1

2006-10-30 03:17:43 · 5 answers · asked by lolit j 1

2006-10-30 03:05:02 · 9 answers · asked by bahram90 1

2006-10-30 02:38:49 · 6 answers · asked by cetinnovations 1

Chem homework due tomorrow:
Under what conditions would you predict that real gases least approximate ideal gas behavior? Explain why real gases behave least like ideal at the conditions stated.

2006-10-30 02:29:50 · 3 answers · asked by natrgrrl 2

2006-10-30 02:12:22 · 4 answers · asked by Meg ♥ 1

2006-10-30 01:58:21 · 4 answers · asked by Meg ♥ 1

2006-10-30 01:55:04 · 4 answers · asked by Meg ♥ 1

Could I use an endothermic reaction to accurately measure the heat capacity of a calorimeter?

2006-10-30 01:43:05 · 2 answers · asked by Anonymous

What is the mass percent of Fe3+ in the sample if a 0.6450 gram sample of iron ore requires 22.40 mL of 0.1000 M Sn2+ to completely react with the Fe3+ content of the ore? The reaction is...

2Fe3+(aq) + Sn 2+(aq) ---> 2 Fe2+ (aq) + Sn4+ (aq)


a.) 19.40 %
b.) 25.02 %
c.) 38.79 %
d.) 77.59%

please show work

2006-10-30 01:22:19 · 2 answers · asked by Alyssia S 1

According to the balanced chemical equation

5H2C2O4(aq) + 2MnO4(aq) + 6H+(aq) -----> 10CO2(g) + 2Mn2+(aq) + 6H2O(l)

a.) 15.5
b.) 38.9
c.) 77.7
d.) 97.2


please show work

2006-10-30 01:18:49 · 1 answers · asked by Alyssia S 1

2006-10-30 01:01:42 · 3 answers · asked by Jazzy C 2

dear sir
pse let know which brand of adhesive joins aluminium foil to aluminium foil and is available in open market. for example medicine strip is aluminium foil.my mo no 9323276089

2006-10-30 00:53:10 · 2 answers · asked by sc 1

According to the balanaced chemical equation.

5 H2C2O4 (aq) + 2 MnO4 (aq) + 6H+ (aq) ----> 10 CO2 (g) + 2 Mn2+ (aq) + 8 H2O (l)

a.) 1
b.) 2
c.) 2/5
d.) 5/2


please show work!

2006-10-30 00:31:37 · 3 answers · asked by Alyssia S 1

how to you tell the difference between cations ( Al3+ and Pb2+ ions), as in when you are testing them? is there a way to tell the difference between the results?

2006-10-29 23:53:19 · 4 answers · asked by Anonymous

answer is gonna be n= ?

2006-10-29 23:50:39 · 3 answers · asked by Anonymous