Chemistry - September 2007

Phosphorus has a -3 charge, but it states pentabromide is Br5 hwo do you convert the phosphorus charge in there?

2007-09-18 23:43:06 · 7 answers · asked by Average Joes 4

Any ideas?

2007-09-18 23:41:44 · 2 answers · asked by Average Joes 4

When I try to solve it I keep getting
H+1(acid) then C6H5O7
What do I do to combine the two H's and what's the actual formula?

2007-09-18 23:40:24 · 4 answers · asked by Average Joes 4

I believe the formulas are:
MnO2 with the name Manganese (II) Oxide
MnBr4 with the name Manganese (IV) Bromide
am I correct?

2007-09-18 23:38:39 · 1 answers · asked by Average Joes 4

What volume of 1-butanol corresponds to 0.040 mol? (MW and density of 1-butanol are 74 g mol, 0.806 g mL

a) 3.67mL
b)4.35mL
c)2.96mL
d)2.38mL

2007-09-18 22:10:04 · 1 answers · asked by awoodifield84 1

are they of the same meaning?

2007-09-18 22:04:36 · 2 answers · asked by saltedpeanut 1

2007-09-18 20:49:22 · 3 answers · asked by ponnusamy b 1

2007-09-18 20:18:22 · 7 answers · asked by Anonymous

2007-09-18 19:35:11 · 1 answers · asked by Anonymous

when we takeout a metal tray our fingers stick with it .why it happens?

2007-09-18 19:23:52 · 4 answers · asked by aryan e 1

For 8.7 mmole of the compund MgSO4*7 H2O:

What is the percent water in this amount of the compound?
What weight of sulfur is there in this amount of compound?

2007-09-18 19:22:35 · 1 answers · asked by Anonymous

can someone tell me the difference?

and how these fats will affect the long lasting factor/hardness in soaps?

thanks.

2007-09-18 19:19:57 · 2 answers · asked by Anonymous

The emulsion has to be stable for min. 3 months. It has then to be stable down to 5% for a couple of hours. Thanks !

2007-09-18 19:11:45 · 1 answers · asked by Anonymous

2007-09-18 18:51:12 · 8 answers · asked by Anonymous

What are the three primary components of IT?

2007-09-18 18:49:46 · 1 answers · asked by kim 2

If iodine is not present a human's diet, the thyroid gland condition called goiter develops. Iodized salt is designed to remedy this condition by providing some calcium iodate as an iodine source in normal table salt. How many atoms of iodine are provided by a 25 mg sample of table salt that contains 0.01% Ca(IO3)2

My answer came out to be 7.7e17 atoms I

2007-09-18 17:26:55 · 2 answers · asked by Anonymous

the question::
Which of the following compounds will react with eachother to form of a precipitate(determine all possible combinations)-Calcium carbonate, aluminum sulfate, barium nitrate, ammonium hydroxide, magnesium acetate

my answers::
CaCO3(aq) + 2NH4OH(aq)--> Ca(OH)2(s) + (NH4)2CO3(aq)
CaCO3 + Ba(NO3)2--> Ca(NO3)2+ BaCO3
CaCO3 + Mg(C2H3O2)2-->Ca(C2H3O2)2
+ MgCO3
3CaCO3 + Al2(SO4)3 -->3CaSO4+ Al2(CO3)
Al2(SO4)+6NH4OH-->2Al(OH)
3 +3(NH4)2SO4

and so on and so forth (im not going to bore you with all these letter/numbers)
i got a total of 10combinations because basically i used all of them
i was wondering if you can tell me if that is right/if im balancing the equations right

also, im having a bit of trouble with labeling the state (aq), (s)
[btw, the states i did for the first one are like that for the rest...at least i think so]
please help with some reassurance/corrections of my work, thanks

2007-09-18 16:51:14 · 2 answers · asked by *mouse* 3

What are the identities of the individual compounds in a mixture of two organic chemicals?

2007-09-18 16:41:52 · 6 answers · asked by dustin d 3

Cisplatin is
K2PtCl4 (aq) + 2NH3 (aq) ---> Pt(NH3)2 Cl2 (s) + 2KCl (aq)
[FYI, Cl is chlorine]

What mass of cisplatin can be made from 100g of K2PtCl4 and sufficient NH3? What mass of KCl is also produced?

I tried converting 100g K2PtCls to moles then to NH3 moles and then to g NH3.
I don't know how to do this problem. :(

Help? Step by step please. Thank you very much! :)

2007-09-18 16:38:42 · 3 answers · asked by v 2

2007-09-18 16:25:12 · 5 answers · asked by Roger! 2

2007-09-18 14:47:46 · 1 answers · asked by katrine_kisses 1

2007-09-18 14:40:12 · 4 answers · asked by Samantha RIOT! 2

2007-09-18 12:43:57 · 2 answers · asked by Anonymous

density=mass/volume

d=612/245=2.497959.....

d=68/6.48=10.493827.......

2007-09-18 12:22:28 · 2 answers · asked by ALESANA 7

Why does a chemical change occur when piece of zinc is in hydrochloric acid & a piece of burning splint is over it?
We did a lab and we put a piece of zinc in hydrochloric acid, placed our thumb over the test tube for one minute, then put a piece of burning splint is over it. I don't understand WHY the chemical change happened. please help me!

2007-09-18 12:02:52 · 3 answers · asked by Stephanieeexoxo 2

Please explain how u got the answer I do not understand this part of my Chem of how to tell if something produces Neg ions or Pos ions

2007-09-18 11:57:11 · 2 answers · asked by Anonymous

Aluminum is placed in Copper (II) chloride. The products are copper and aluminum chloride. is the aluminum chloride a supernate (liquid solution) or is it a precipitate (solid)?

2007-09-18 11:51:06 · 5 answers · asked by ♠Jay♠ 5

2007-09-18 11:45:52 · 1 answers · asked by Sarah M 1

do you know what the subscript and superscripts represents in isotopes?

2007-09-18 11:33:23 · 1 answers · asked by Anonymous

2007-09-18 11:05:30 · 4 answers · asked by Sarah M 1