English Deutsch Français Italiano Español Português 繁體中文 Bahasa Indonesia Tiếng Việt ภาษาไทย
All categories

Chemistry - November 2007

[Selected]: All categories Science & Mathematics Chemistry

I want to make it very easy with common household objects. Thanks.

2007-11-11 08:07:28 · 2 answers · asked by Anonymous

Nitric oxide, NO, reacts instantly with oxygen gas to give nitrogen dioxide, NO2, a dark brown gas.
In one experiment 18.49 g of NO is mixed with 13.15 g of O2.

How many grams of NO2 will be produced?

2007-11-11 06:47:59 · 1 answers · asked by Anonymous

over heated iron wool.If the total pressure is 866 mmHg, calculate the partial pressures of N2 and H2.

How do u solve this equation, can u plz explain on wht to do with these type of equations. n also if u can show fully how u got ur answer so i know how to do it . thanks in advance

2007-11-11 06:45:39 · 4 answers · asked by Rehena Khan 2

1. If water is a linear molecule, then it would probably be nonpolar
2. If water is a linear molecule, then London dispersion force would not be one of its IMF
3. If water is a linear molecule, then it will probably have higher intermolecular forces
4. If water is a linear molecule, then its boiling point will probably still remain at 100 C

Thanks!

2007-11-11 05:56:32 · 2 answers · asked by chemquestions1 1

it's in my hw, please help.

by experimentation it has been found that the molecule of dinitrogen oxide has a non-zero dipole moment and that ions of mass 44, 30, 28, 16 and 14 are obtained in the mass spectrometer. which of the structures is supported by the data? show how the data are consistent with this structure.

well, i would guess it's NNO, but i don't understand the data given

thank u very much

2007-11-11 05:53:50 · 2 answers · asked by Ganbatteru 3

why is that? can you explain it to me please?

thank you

2007-11-11 05:45:17 · 2 answers · asked by Ganbatteru 3

calculate mass of silicon using the following exact atomic masses and % abundance for each of it's naturally occuring isotopes? ^28Si(92.21%), atomic mass of 27.97693 amu, ^29Si(4.70% atomic mass of 28.97649 amu, and ^30Si(3.09) atomic mass of 29.97376 amu.
please explain how you could the answer thank you so much

2007-11-11 05:44:28 · 2 answers · asked by Karina S 1

Answer in units of g.

2007-11-11 05:40:23 · 1 answers · asked by Anonymous

total ionic equation
and net ionic equation for both equations.

2007-11-11 05:19:00 · 1 answers · asked by Slash_GNR 1

2007-11-11 05:08:10 · 5 answers · asked by Where Are You Summer?! 3

What is alkalinity equivalents and how are you going to compute the total alkalinity from it?

1.0x10^-3 is the alkalnity equivalents

total alkalinity = [HCO3^-](bicarbonate anion)+2[CO3^2-](carbonate anion)+[OH-](hydroxide anion)-[H+](hydronium cation)

pH = 10.4

2007-11-11 04:54:50 · 1 answers · asked by gelo 2

1. Iron metal can be produced from the mineral hematite, Fe2O3, by reaction with carbon:

Fe2O3(s) + C(s) --> Fe(s) + CO(g)
(a) Balance the equation.
(b) How may moles of carbon are needed to reach with 525 g of hematite?
(c) How may grams of carbon ar eneede dto react with 525 g of hematite?

2. In the preparation of iron from hematite (above question), how many kilograms of iron are present in 105 kg of hematite?

3. We saw in (question 1) that iron metal can be made by heating iron ore with carbon according to the (unbalanced) equation:
Fe2O3(s) + C(s) --> Fe(s) + Co2(g)
(a) How many kilograms of iron can be obtained from the reaction of 75.0 kg of Fe2O3?
(b) If 51.3 kg of iron is obtained from the reaction in part (a), what is the percent yield?

4. Which of the following substances are likely to be soluble in water?
(a) ZnS
(b) Au2(Co3)3
(c) PbCl2
(d) MnO2

2007-11-11 04:53:48 · 1 answers · asked by Anonymous

I am writing a huge term paper on MnSOD, and I can not find anything on how the metal is bound to it's coordinating ligands. Are these interactions covalent, electrostatic, or is the metal just "caged in"? If you have a source, I would greatly appriciate it.

2007-11-11 04:50:22 · 1 answers · asked by J 2

Fe(s) + Cd2+(aq) ---> Fe2+(aq) + Cd(s).
when the [Fe2+] = 0.15 M and [Cd2+] = 1.0 M?

2007-11-11 04:32:39 · 2 answers · asked by Chem 111 1

2007-11-11 03:19:38 · 3 answers · asked by ? 2

The equilibrium constant Kc for the reaction
PCl3(g) + Cl2(g) <--> PCl5(g)

equals 49 at 230C. If 0.400 mol each of phosphorus thrichloride and chlorine are added to a 4.00 L reaction vessel, what is the equilibrium, what is the equilibrium composition of the mixture at 230C?

Help me with this problem, thanks in advanced

2007-11-11 03:18:35 · 1 answers · asked by some guy 1

I need help with this. Its my home work in science that I can't reallt understand. Please help me if you can. thanks

2007-11-11 02:33:12 · 16 answers · asked by PrincessAshley 1

and what hold them as such unique structures of mass

2007-11-11 02:12:53 · 8 answers · asked by Thor 2

Thress proenzymes that are involved in digestion of proteins in the stomach and intestines are pepsinogen, chymotrypsinogen, and trypinogen. what is the advantage of producing these enzymes as inactive peptide?

2007-11-11 01:47:31 · 3 answers · asked by ham 1

2007-11-11 00:42:01 · 9 answers · asked by Anonymous

2007-11-11 00:36:56 · 6 answers · asked by Chris M 1

i would like to know, what you have to do to determine which is the best solvent to use.
Thank You!!!

2007-11-11 00:25:16 · 2 answers · asked by Arbid B 2

2007-11-10 18:01:47 · 3 answers · asked by Mark Y 1

Spectroscope

2007-11-10 17:05:03 · 2 answers · asked by Anonymous

why are the atomic mass listed on the periodic table decimal values, and not whole numbers?

2007-11-10 15:03:54 · 4 answers · asked by Anonymous

2007-11-10 14:44:16 · 1 answers · asked by brad l 2

I'm trying to reduce the iron in FeCl3, from Fe (III) to Fe(II), using ascorbic acid, but I don't know how to write the balanced chemica equation. (I think it has something to do w/adding H20 as a reactant)? Is this redox??

ascorbic acid is C6H8O6

2007-11-10 14:43:58 · 2 answers · asked by Natalie T 1

2007-11-10 14:10:59 · 18 answers · asked by Chlorine 2

what volume of lead (of density 11.3 g/cm cubed) has the same mass as 361 cm cubed of a piece of redwood of density .38g/cm cubed

2007-11-10 13:46:35 · 1 answers · asked by Jessica 4

and what is it's chemical formula / molecular formula and chemical name?

thankyou

2007-11-10 12:46:12 · 3 answers · asked by real 2

fedest.com, questions and answers