Chemistry - October 2006

A.2.17 mol Pb/(207 g Pb/mol Pb)
B. (207 g Pb/mol Pb) × 2.17 mol Pb
C. (6.022 × 1023 atoms Pb/mol Pb) × 207 g Pb/mol Pb
D. (207 g Pb/mol Pb)/2.17 mol Pb

2006-10-09 12:10:31 · 4 answers · asked by Ashley C 1

2006-10-09 12:02:17 · 3 answers · asked by Anonymous

2006-10-09 11:59:36 · 6 answers · asked by Anonymous

2006-10-09 11:52:39 · 6 answers · asked by Anonymous

A.1
B. 2
C.4
D. 6

2006-10-09 11:42:51 · 2 answers · asked by Ashley C 1

2006-10-09 11:11:31 · 8 answers · asked by Anonymous

2006-10-09 11:08:56 · 8 answers · asked by Anonymous

A. 32.2
B. 67.3
C. 8.43
D. 46.7

2006-10-09 11:01:45 · 4 answers · asked by Ashley C 1

1.WHAT KIND of bond forms between the nitrogen atoms and hydrogen atoms in ammonia (NH3) ?
2.Whole milk consists of microscopic fat globules suspended in a solution of nutrients. Is milk a homogeneous or a heterogeneous?Explain...
3.Why are negative ions usually larger than pisitive ions?
4.What is the smallest unit of a molecular compound with the properties of that compound?

2006-10-09 10:54:41 · 2 answers · asked by Anonymous

2006-10-09 10:44:59 · 14 answers · asked by Onions 2

2006-10-09 10:44:28 · 5 answers · asked by Onions 2

2006-10-09 10:42:02 · 2 answers · asked by Caroline Yan 1

Hey, we have a project in my chemistry class. we have to dress up like a certain element, but be very creative. Most of the class has chosen their outfit, taking the very easy and most popular ones.
I was thinking about titanium and dressing up like a football player, as in the Titans. I dont know though.
Any other ideas on what I can be? thanks!!

2006-10-09 10:35:40 · 8 answers · asked by Honey 1

Thanks for any pics

2006-10-09 10:35:07 · 4 answers · asked by cetinnovations 1

Identify which reagent gets oxidized in each of the following redox reactions

(HIO3 or H2SO3) -- HIO3 + 3H2SO3 --> HI + 3H2SO4

(HNO3 or H2S) -- 2HNO3 + 3H2S --> 3S + 2NO + 4H2O

(Si or Cr2O3) -- 3Si + 2Cr2O3 --> 4Cr + 3SiO2

(PbS or O2) -- 2PbS + 3O2 --> 2PbO + 2SO2


Identify which reagent gets reduced in each of the following redox reactions

(N2 or H2) -- N2 + 3H2 --> 2NH3

(H2SO3 or HNO3) -- 3H2SO3 + 2HNO3 --> 2NO + H2O + 3H2SO4

(Cr2O3 or Al) -- Cr2O3 + 2Al --> 2Cr + Al2O3

(CuCl2 or Zn) --CuCl2 + Zn --> ZnCl2 + Cu


Can you also explain to me how to figure this question out please.. It will benefit me in understanding others like it.

2006-10-09 10:15:58 · 3 answers · asked by Magnitudex 2

2006-10-09 10:11:08 · 1 answers · asked by SCIENCE MAN 1

Also I have another question i'm not sure about..
What patterns can be seen in the ways elements react first with oxygem and then with water to form either acids or bases?

2006-10-09 10:06:21 · 3 answers · asked by Aries1704 3

2006-10-09 10:01:08 · 6 answers · asked by cetinnovations 1

and why is there a 1 reference...

2006-10-09 09:49:03 · 4 answers · asked by Thx 4 All The Fish 2

I already have aluminum and tin i need one more

2006-10-09 09:22:33 · 8 answers · asked by EMO cupcake 4

a) 3.65 M
b) 3.83 M
c) 4.17 M
d) 4.33 M
e) 4.50 M

2006-10-09 09:14:49 · 2 answers · asked by Ben K 1

a) as a disinfectant in swimming pools.
b) to remove rust from steel.
c) to clean mortar from brick.
d) to make corn syrup from corn starch.
e) to aid in the changing of starches to sugar in the stomach.

2006-10-09 09:12:38 · 4 answers · asked by Ben K 1

For each of the following reactions, answer:
True or False? -- "This is an oxidation-reduction (redox) reaction."

3KCN(aq) + 2KMnO4(aq) + H2O(l) 3KCNO(aq) + 2MnO2(s) + 2KOH(aq)

4Br2(aq) + H2S2O3(aq) + 5H2O(l) 8HBr(aq) + 2H2SO4(aq)

Hg2Cl2(s) + 5HNO3(aq) 2Hg(NO3)2(aq) + HNO2(aq) + 2HCl(aq) + H2O(l)

6KCN(aq) + FeCl3(aq) K3Fe(CN)6(aq) + 3KCl(aq)

3Cl2(aq) + 6NaOH(aq) NaClO 3(aq) + 5NaCl(aq) + 3H2O(l)

10HNO3(aq) + 4Zn(s) 4Zn(NO3)2(aq) + NH4NO3(aq) + 3H2O(l)

Na2SO3(aq) + H2SO4(aq) Na2SO4(aq) + SO2(g) + H2O(l)

2HNO3(aq) + CuO(s) Cu(NO3)2(aq) + H2O(l)

2006-10-09 08:54:56 · 4 answers · asked by Magnitudex 2

2006-10-09 08:31:09 · 7 answers · asked by Anonymous

Determine net ionic equations, if any, occuring when aqueous solutions of the following reactants are mixed.

Select "True" or "False" to indicate whether or not the stated reaction (or "no reaction") correctly corresponds to the expected observation in each case.

Sodium phosphate and potassium nitrate; No reaction occurs.

Copper(II) sulfate and ammonium carbonate; Cu2+(aq) + CO32-(aq) CuCO3(s)

Nickel(II) chloride and lead(II) nitrate; No reaction occurs.

Ammonium sulfate and barium nitrate; Ba2+(aq) + SO42-(aq) BaSO4(s)

Lead(II) nitrate and sodium chloride; Pb2+(aq) + 2Cl-(aq) PbCl2(s)

2006-10-09 08:22:59 · 2 answers · asked by Magnitudex 2

My science fair topic this year is the effect of liquids on teeth. Basically, I want to get some teeth, find the initial mass, set them in liquids 24/7 for a while, and find the final mass to see how the liquids have corroded the teeth (much like the well-known project in which a t-bone is dissolved in soda). However, I would like to know, will I find a significant change in the mass of the tooth within a month's time or does it take longer than that? I don't want this to be my science fair project if it takes years for a tooth to have any noticeable loss of mass. Can anyone help me out?

2006-10-09 08:10:00 · 5 answers · asked by Anonymous

2006-10-09 08:07:28 · 3 answers · asked by morpeh19 2

hey can yall help me w/ sum chemistry problems? here they are:

what element in the periodic table has 6 electrons in their outer energy level?

what is the largest element in row 4....xcept 4 noble gasses?

what is the smallest element in row 3......excluding the noble gasses?

2006-10-09 07:43:52 · 3 answers · asked by tracklurver09 3

Does anyone know any good chemistry labs/ experiments pertaining to food chemistry and different techniques of cooking? It needs to be high school level chemistry.

2006-10-09 07:41:07 · 2 answers · asked by Kate 2

IO4- + I- + H+---> I2 + H2O (all #s denote subscripts)

Please explain how you got to each step...how you balanced it, then how you ultimately identified the oxidizing and reducing agents. Thank you.

2006-10-09 07:26:49 · 2 answers · asked by Anonymous