Chemistry - March 2007

Calculate the concentration of all ions present in each of the following solutions of strong electrolytes.

1) 5.00 g of NH4Cl in 400.0 mL of solution
NH4+
_____ M
Cl-
_____ M

2) 1.00 g K3PO4 in 500.0 mL of solution
K+
_____ M
PO43-
_____ M

(3) 0.450 mol of Ca(NO3)2 in 100.0 mL of solution
Ca2+
_____ M
NO3-
_____ M

ps. correct to appropriate sig. fig.

2007-03-17 10:18:31 · 1 answers · asked by Mendel R 1

Fe2O3(s) + 6 HCl(g) ------>2 FeCl3(s) + 3 H2O(g)

∆H° =_____kJ


6 C(s) + 6 H2O(l) ------> C6H12O6(s)

∆H° =_____kJ

2007-03-17 09:51:11 · 1 answers · asked by Ham Wallet 1

Do you think it is possible to genetically engineer narcotic plants (like opium or coca) to the effect that once they multiply with their natural counter-parts they spawn plants that would no longer have narcotic properties?

I am not a bioengineer, but would like to know if it is possible.

2007-03-17 09:47:24 · 5 answers · asked by Anonymous

Given delta H (subscript f) (enthalpy change) for 1M HCl (aqueous) to be -40.0 Kcal/mole and delta H (subscript f)(enthalpy change) for 1M MgCl2 to be -191 Kcal/mole, use the summation law to calculate delta H for reaction with Mg and HCl and compare your experimental values. Calculate your % error.

2007-03-17 09:47:21 · 1 answers · asked by I_color_outside_the_lines 4

2007-03-17 09:43:48 · 3 answers · asked by Anonymous

The pH of a 0.10 M HF solution is 1.7. Calculate the percent ionization of the acid.

also...

What is the [H+] for a solution with a pH of 3.3

How do you figure these problems out? And if you're nice enough to help me with this, could you please also show the steps?

2007-03-17 09:43:10 · 5 answers · asked by I_color_outside_the_lines 4

2007-03-17 09:42:47 · 1 answers · asked by Anonymous

2007-03-17 09:40:01 · 1 answers · asked by Anonymous

1- vinegar
chemical name: acetic acid
formula:CH3COOH
2-Baking soda:
chemical name:Sodium be Carbonate
formula:NaHCO3

2007-03-17 09:33:07 · 3 answers · asked by Anonymous

I thought that it wouldn't because the catalyst can only act to a certain capacity, but I am not sure.

2007-03-17 09:32:24 · 4 answers · asked by cookies1201 2

does ne1 kno nething Special or Important about the muscle relaxer Icy Hot?

2007-03-17 09:28:46 · 7 answers · asked by Neicy 1

i having some trouble with naming hese compounds can u help me out?
since i cant draw them i'll try to explain them to u:

1. a pentagon. on one Carbon is attached a CHCH3 and attached to that is a CH3
then the 3rd Carbon from that is a CH3


2. CH3CH2CH2CH2COCH3 and on the 5th carbon is a :O: with a double bond.

3. it sort of looks like this:(!!=double bond)
:O:
!!
/ \
H H

4. /\\/ then a trile bond to N at the end

2007-03-17 09:20:36 · 3 answers · asked by Anonymous

2007-03-17 09:11:32 · 4 answers · asked by Anonymous

its for a cience fair project...........

2007-03-17 08:56:18 · 5 answers · asked by Andrea M 1

a) these electrons are able to pair with unpaired valence electrons
b) the nuclear charge attracts them
c) there are 3 more spaces available in their outermost shells
d) all of the above

2007-03-17 08:55:28 · 3 answers · asked by Cindy B 2

a. Each electron is restricted to only one of the two lobes of a p orbital,
b. the electron actually exists in both lobes at the same time.
c. it accelerates to the speed of light.
d. it rapidly jumps around the nucleus by momentarily entering into a s orbital.

2007-03-17 08:46:13 · 1 answers · asked by Cindy B 2

1,2,3 - propanetriol

2007-03-17 08:36:58 · 3 answers · asked by Anonymous

Analysis of compound "X" (molar mass 72) containing C, H, and O gave and analysis of 66.7% C and 11.1% H. the compund neither reacted with pheny hydrozine nor gave a positive iodoform test (that's the HALOFORM test). reaction with OZONE and subsequent hydolysis gave METHANAL as on of the products. A mole of "X" absorbed a mole of hydrogen when catalytically hydrogenated to give a product "Y" which could be oxidzed by KMNO4 (pottasium permanganate) to a product "Z" (molar mass 72) which did not react with Fehling's solution. Identify the compounds X, Y and Z.

so far i have found the molecular formula of the compound to be C4H8O. and the degree of unsaturation to be 1. i wanted to really know what is the structure of this compound.

i thought "X" would be .......CH2=CHCH2CH3 with an OH group attached to the 2nd carbon of the double bond.

"Y" would be CH3CH2(OH)CH2CH3
"Z" - CH3C(=O)CH2CH3. ketones do not react to fehlings reagent.

this a h-work question.

2007-03-17 08:33:44 · 1 answers · asked by CaribbeanChica 3

can someone give me the deifnition of chemical immunity i cannot finds it anywhereand i really need the answer asap

2007-03-17 08:22:45 · 2 answers · asked by Anonymous

I just want to know the main uses for phenol. And when I look it up they give me:

The primary use of phenol is in the production of phenolic resins, which are used in the plywood, construction, automotive, and appliance industries.

I know it's in english but what do they mean by it. What are they implying what the use of phenol is.

2007-03-17 08:21:06 · 3 answers · asked by A 2

and uh... Menthol if u dont mind :-)

2007-03-17 08:20:37 · 4 answers · asked by Neicy 1

2007-03-17 08:15:04 · 2 answers · asked by Shirley R 1

can some1 help me name these cmpnds. because my teacher has no idea what hes talking about and now i dont know what and how to do this. p.s. wherever then #s are, they r subscripts. and the ! = a bond

1. :O:
!!
H3CCNH2

2. CH3
!
CH3 _ CHCH3
\/ \/
\_/

3. :O:
!!
/ \
H H


4. :O:
!!
/ \ /\
O

2007-03-17 08:10:29 · 1 answers · asked by Anonymous

Thallium(I) hydroxide is a strong base used in the synthesis of some organic compounds. Calculate the pH of a solution containing 2.17 g TlOH per liter.

2007-03-17 08:01:30 · 1 answers · asked by Anonymous

And tell me if denser liquids will freeze faster at 8 degrees F than less dense liquids

2007-03-17 07:45:34 · 2 answers · asked by iask 2

2007-03-17 07:11:00 · 5 answers · asked by Latasha G 1

Calculate the pH of the base buffer made by mixing 60.0 mL of .100M NH2 with 40.0 mL of .100M NH4Cl.

The answer is 9.43 but how do I get to that answer? I am studying for a Chem quiz and can't figure it out.

2007-03-17 07:02:44 · 1 answers · asked by calculusgirl1979 2

2007-03-17 06:22:24 · 3 answers · asked by lalalalalalala 1

I'm planning on taking accetic acid and salt in one container and NH4+ in the other with salt.

Will any of them producce crystals?

2007-03-17 06:08:46 · 3 answers · asked by burninhotboi 2

Does anyone know the pH level of motor oil and car wash detergent? Specifically, Castrol Motor Oil and Turtle Wax Car Wash Detergent.

2007-03-17 05:58:54 · 2 answers · asked by Alanna 2