Chemistry - October 2007

I want to do the problem myself, I just cant figure it out.
Some mol of an inorganic salt are dissolved in 1.00 L of water in a constant pressure solution calorimeter, the temperature of the calorimeter decreases. The total heat capacity of the calorimeter is also given
How do you figure out the molar enthalpy of solution for this salt?

2007-10-06 13:45:15 · 1 answers · asked by Anonymous

umm im doing a project to make a model atom and how many electrons & protnos does carbon have plz?

2007-10-06 13:19:36 · 5 answers · asked by Anonymous

also, Li+

Is this an ion; and why or why not?

2007-10-06 12:22:41 · 2 answers · asked by RogerDodger 1

Okay i've tried already 4 times.. And i have one more try ( since i do my university assignments on the computer) I really don't understand i've done everything that book told me, but im missing something.. Can someone please show me step by step You don't need to give me the anwser... you can place different numbers if you like. Please help thanks :(

Combustion of C12H22O11(s) (sucrose or "table sugar") produces CO2(g) and H2O(l).
When 2.37 g of sucrose is combusted in a constant volume (bomb) calorimeter, 39.1 kJ of heat is liberated.

Calculate deltaE for the combustion of 7.50g of sucrose.

2007-10-06 11:24:25 · 2 answers · asked by Anonymous

An element (call it X) in Group 1A of the periodic table forms a compound with an element (call it Y) of Group V1A. What would be the most likely formula and nature of the compound?

1)X2Y; covalent
2)XY6; covalent
3)X6Y; ionic
4)XY2; ionic
5)XY6; ionic
6)X2Y; ionic
7)XY2; covalent

2007-10-06 11:19:18 · 2 answers · asked by Alexa S 1

Propanol is burned in air
is propanol C3H8O2? if it is, then is it C3H8O2+O2-----> C3H8O5?


(please show me step by step, thanks)

2007-10-06 11:08:05 · 1 answers · asked by Q 2

In the Periodic Table of the elements you note that each electron shell fills to capacity before starting to fill the next shell. At least this is the case as far as Argon. Then at Potassium, the N shell begins to fill even though the M shell contains only 8 of its possible 18 electrons. WHY IS IT SO?

2007-10-06 10:58:21 · 3 answers · asked by snas 2

when I think I touched something on my finger and felt a burning/stinging sensation. I looked at my finger and it was a powdery white in the area that was touched. I tried to wash it off with water, but it wouldn't come off.

At around halfway through my next class, I looked down and the powdery stuff was gone. My hand was a little sweaty because I kept it bunched up in a fist.

Anyways, nothing serious happened, but I want to know what I touched and why that happened.

I was working with some chemicals: hydrogen peroxide and manganese dioxide. Those were the only chemicals at the time. I think it might have been the manganese dioxide...

2007-10-06 10:55:51 · 1 answers · asked by ¤Elva¤ 4

Okay I don't understand what we have to do here. I mean like theres so many given numbers ... and i've looked in my text book and theres so many equations i dont know which one to pick... If anyone can please help me. You don't need to give me the anwser, if you like change the numbers around that would be okay ( as long as they make sense ) but yeah.. i would really appreciate it if someone can show me step by step.

Thanks sooooo much.

A 25.5-g sample of an unknown metal is heated to 92.5°C and is placed in a perfectly insulated container along with 184.g of water at an initial temperature of 20.05°C. After a short time the temperature of both the metal and water become equal at 23.30°C.
The specific Heat Capacity of water is 4.18 J/g/K in this temperature range.
What is the specific heat capacity of the metal?

2007-10-06 10:34:04 · 3 answers · asked by Anonymous

How many grams of phosphorus react with 36.4 L of O2 at STP to form tetraphosphorus decaoxide?

P4(s) + 5 O2(g) P4O10(s)

________g

2007-10-06 10:25:41 · 2 answers · asked by ronnie c 1

I need to make soap. I need to know a recipe that says everything I need to know including the amount of ingredients, the materials, and how I will have to make the soap. The recipe should preferably have lye as an ingredient, but lye crystals are okay. Also, if you are going to give a link, don't give anything confusing. Also, can you say a place where lye can be bought in Rockford, Illinois? Thanks a lot!

2007-10-06 10:11:23 · 4 answers · asked by Black Fire 1

2007-10-06 10:06:48 · 4 answers · asked by Anonymous

2007-10-06 09:29:25 · 1 answers · asked by lynda w 1

1) 2.4 X 10^24 atoms
2) 6.6 X 10^-24 atoms
3) 4.8 X 10^24 atoms
4) 1.5 X 10^23 atoms

2007-10-06 08:52:54 · 2 answers · asked by Anonymous

specifically the mobile and stationary phases

2007-10-06 08:45:06 · 2 answers · asked by ? 4

2007-10-06 08:21:36 · 3 answers · asked by lambo6 1

2 OH- (aq) + Cr2O72-(aq) 2 CrO42-(aq) + H2O(l)

2007-10-06 07:32:14 · 1 answers · asked by Anonymous

just curious.

many thanx.

2007-10-06 07:26:32 · 14 answers · asked by Anne Nonny Mouse 4

I have a research on any two elements that may be found free in nature . The question says : List three physical properties of each and relate their uses to these physical properties .. so i was wishing people in yahoo answers question could help me !

2007-10-06 07:06:40 · 3 answers · asked by mohammad h 2

2007-10-06 07:04:59 · 1 answers · asked by akmamamias 1

I thinbk that the Oxide on the strip may cause there to be too much Oxide at the final weigh in.

2007-10-06 06:48:23 · 3 answers · asked by Laura 1

ethanoic acid with an acid catalyst(such as concentrated h2so4)
Benzoyl chloride, c6h5c0cl
propanoyl chloride
hexanoic acid with an acid catalyst as in first and name them

2007-10-06 06:37:31 · 5 answers · asked by Anonymous

a. the amount of methane that contains 4 x 6.022 10^23 H atoms

b. the amount of methane that contains two molecules of H2

c. the amount of methane that contains 12.0 g C

2007-10-06 05:53:53 · 2 answers · asked by jeff S 1

i have to give a reason for that and suggest the trough(if formed) is likley to be broadened.

2007-10-06 04:46:36 · 1 answers · asked by Anonymous

also which of the two compounds has a broadened trough(peak) at this wavenumber?

2007-10-06 04:26:46 · 4 answers · asked by Anonymous

(a)structual formula of the compound
(b)dissociation of ions in the compounds
(c) number and arrangement of electrons in the atoms of the elements
(d) model of the atom

2007-10-06 04:15:48 · 3 answers · asked by nana ♥ 2

2007-10-06 04:15:44 · 6 answers · asked by minh t 1

I know this compound is insoluble, but what's its numerical solubility at 0 and 100 deegres Celcius? (or anywhere between these temperatures)

2007-10-06 04:12:18 · 3 answers · asked by Chris D 1

ethanol
propan-2-ol
propan1-ol
cyclohexanol
b)name the four compounds
please help me on this

2007-10-06 04:01:53 · 2 answers · asked by Anonymous

why is the last orbital in an atom usually not full loaded with electrons. example 3s2 3p4 why it is a general behavior of atoms

2007-10-06 03:38:31 · 2 answers · asked by Ozgur 1