Chemistry - October 2007

can anybody tell me why i need electron configuration, and what it is used for??

2007-10-13 15:39:06 · 4 answers · asked by Anonymous

2007-10-13 15:31:03 · 2 answers · asked by Shaggy 1

What is the average kinetic energy of CH4 and N2 molecules at:

299 K-

523 K-

2007-10-13 15:20:01 · 1 answers · asked by joey d 1

(the numbers are the ones that go at the bottom right of the letter)

Group A ____| Group B
C6,H12,O6 __| NaCl
C12,H22,O11| NH3

A) Gourp A - disaccharides, Group B - monosaccharides
B) Group A - monosaccharides, Group B - disaccharides
C) Group A - organic, Group B - inorganic
D) inorgainc, Group B - organic

im pretty sure its B or D

2007-10-13 15:14:19 · 2 answers · asked by A? 2

Water is often used as a standard in making comparisons between substances. why do you think this is the case?

2007-10-13 13:57:40 · 1 answers · asked by Josiah 1

The antacid in question (with an active ingredient of Ca(HCO3)2), upon treatment with excess hydrochloric acid, a 0.433 g sample gives 88.15 mL of CO2 at 25.00oC and 1.000 atm. What percentage of the antacid is active ingredient? Assume a perfect system (i.e. the yield is 100%)

2007-10-13 13:55:53 · 1 answers · asked by May 3

gram-gram

Li + Cl2 --> LiCl

a) Given 10 grams of Chlorine determine grams of Lithium chloride.

first thing to do is balance the equation, right?

Li + Cl --> LiCl

to

2Li + Cl2 --> 2LiCl

2007-10-13 13:53:51 · 6 answers · asked by ashley 1

2007-10-13 13:49:47 · 4 answers · asked by Anonymous

the method used to find the density of a regular solid will not work for all solids? why not? plz help, ill chose you as the best answer!

2007-10-13 13:45:41 · 4 answers · asked by Josiah 1

2007-10-13 13:40:15 · 3 answers · asked by sara 1

ok we have to do this project for mole day and i have no idea how to do it.

I need to know how many skittles make up 1 mol?


any ideas on how i figure that out? pleaseee...be as detailed as possible =).

10 points to the person that helps me the most!

2007-10-13 13:39:40 · 7 answers · asked by me 1

i am doing school online and i haven't yet received my textbook yet

2007-10-13 13:38:52 · 1 answers · asked by sara 1

when aqueous solutions of HCL and K3PO4 are stirred together, allowing the four ions aboce to repartner, what two neutral compounds could result?

2007-10-13 13:37:26 · 1 answers · asked by Jelisa K 1

2007-10-13 13:35:47 · 1 answers · asked by Jelisa K 1

2007-10-13 13:29:49 · 1 answers · asked by Anonymous

2007-10-13 13:27:23 · 1 answers · asked by Anonymous

I did a lab experiment with an unknown solution. I noticed that my solution had a sweet scent and I noticed that the solution has a boiling point near the same boiling point as Toluene. I was wondering if Toluene has a sweet smell?

2007-10-13 13:26:00 · 4 answers · asked by Emma H. 1

2007-10-13 13:25:23 · 1 answers · asked by Anonymous

2007-10-13 13:23:38 · 3 answers · asked by Anonymous

Acetaldehydy, Ch3CHO, (d= 0.788 g/ml) a liquid used in the manufacture of perfumes, flavors, dyes, and plactics, can be produced by the reaction of ethanol with oxygen.

CH3CH2CHO + O2 ------------------> CH3CHO + H2O (Unbalance)

How many liters of liquid ethanol (d-0.789) must be consumed to produce 25.0L of acetaldehyde

2007-10-13 13:20:29 · 1 answers · asked by evilshenanegans 1

A sample of NiCl*H2O is found experimentally to contain 0.0116 moles of H2O, 0.0055 moles of Ni, and 0.00121 moles of Cl. What is the molecular formula of NiCl*H2O? How can I calculate it?

In the actual question, it says Ni(subscript x)Cl(subscript y) * zH2O, but i dont really think those are important. And does anyone know why they are there or why the z is infront of the water molecule and not a subscript?

2007-10-13 13:09:20 · 4 answers · asked by Jamie 3

Some ingredients break our skin out and I would like to know exactly what the heck it is before I purchase them. There are also generics on the market but none of the boxes tell exactly whats it is! Some just say latex free, some say natural rubber latex and so on. It's aggrivating....I can't find this information on Google, Yahoo etc. It seems almost top secret! If anyone can find links on the technical ingredients can they please post them so I can read about it. My family would appreciate it!

Is it the same as the adhesive used on bandaid bandages, I think it is different.

2007-10-13 13:08:39 · 3 answers · asked by char__c is a good cooker 7

The fermentation of glucose, which occurs primarily when the glucose concentration is high or when oxygen is not available. The cells attain a maximum specific growth rate of about 0.45 hr-1 with a low biomass yield of 0.15 g dry mass per gram glucose consumed and a high respiratory quotient (the ratio of CO2 production rate to the O2 consumption rate) and a low energy yield of only about 2 ATP per mole of glucose metabolized. The stoichiometry of this reaction is

2007-10-13 12:53:08 · 2 answers · asked by Anonymous

3H_2 (g) + N_2 (g) ==> 2NH_3 (g)

please note that the underscore denotes subscript
(ex. H_2O

2007-10-13 11:30:32 · 4 answers · asked by Anonymous

If two metals that start at the same temperature and we add heat- metal B changes water from 5ºC to 15ºC, and metal A changes the temperature of the water from 5ºC to 45ºC, which metal has the higher specific heat?

2007-10-13 11:27:58 · 2 answers · asked by Linda C 1

If a solution of [M_o(NH_3)_6] Cl_3 has an absorbance of 1.21 when measured in a cell with a path lenght of 1.20 cm, what is it's concentration? The molar absorptivity at the wavelenght at which the measurement was obtained is 130 M^-1 cm^ -1

_# means that # is a subscript

^# means that # is a power

2007-10-13 11:12:28 · 1 answers · asked by Anonymous

i have to do electron dot structures for these molecules.
i think i got the answers to most of them, but im not sure.
it says to include all resonance structures.
can someone explain what that is.

methane CH4.
ethane C2H6
methanol CH4O
ethanol C2H6O
carbonate ion CO3 2-
silicon dioxide SiO2
nitrous oxide N2O
sulfate ion SO4 2-
phosphate ion PO4 3-
sulfur dioxide difluoride SO2F2

obv. you cant type this out..
but does anyone know of a website(s) that would have the answers.
please send all of the links.
first person with all links gets 10pts.

2007-10-13 11:01:55 · 2 answers · asked by Anonymous

Experiments with calcium show that it will emit electrons if light above 6.55*10^14 Hz is used. What is the kinetic energy of an electron when light with frequency of 7.26*10^14 Hz shines on the surface?

Thanks

2007-10-13 10:55:14 · 1 answers · asked by RelientKayers 4

how many electrons are in Ca2+???

2007-10-13 10:33:36 · 7 answers · asked by frizzy_ghost 1

CAn any of u give Tell me a biological discovery dealing with Biochemistry and the person who discovered it??

2007-10-13 10:29:11 · 2 answers · asked by Anonymous