Chemistry - March 2007

2007-03-01 09:15:15 · 1 answers · asked by tikki 2

The ground state of the model uses an extracellular fluid of the following composition: KCl - 5mM, NaCl - 130mM, Na2SO4 - 10mM What is the concentration of K+ in this solution? Your answer should be given in mM but you should not enter the units. Give your answer in whole numbers only, no decimal places.

2007-03-01 09:14:34 · 1 answers · asked by Anonymous

Nitrogen dioxide decomposes according to the following equation, for which Kp = 0.00063 at a given temperature.
2 NO2(g) <=> 2 NO(g) + O2(g)
A pressure of 5.74 atm of NO2 is placed in a container, and allowed to come to equilibrium. What is the equilibrium partial pressure of O2(g)?

Correct Answer; 0.1731

2007-03-01 08:49:59 · 1 answers · asked by other_user 2

anybody know a website with the hazards/safety precautions for chemicals??

2007-03-01 08:27:22 · 3 answers · asked by justice_is_spoonfed 2

3A2---> products, the generic rate law is rate=k[A2]^p
where k is a constant and p = order of reaction
info I have-----
[A2]o ------------time for color change ---------- rate(min^-1)
0.10 -------------------7.50min-------------------------- ______?___

0.20 -------------------2.00min-------------------------- ______?___

0.30 -------------------1.30min-------------------------- ______?___

0.40 -------------------0.90min-------------------------- _______?__

0.50 -------------------0.50min--------------------------________?_

(hint- the reaction order p isnt a whole #)
I know that we are looking for the slope of the line, but it never comes out sraight when I graph it. I tried using
log(rate) = logk` + plog[A] + c I just cant seem to find the slope!
Help please....

2007-03-01 08:25:22 · 1 answers · asked by malasunas 3

2007-03-01 08:08:11 · 3 answers · asked by burton l 1

i cant get the correct answer for this problem. What is it and how do you get it.


How much heat in kilojoules is required to warm 12.4 g of ice, initially at -10.0°C, to steam at 110.0°C? The heat capacity of ice is 2.09 J/g °C and that of steam is 1.84 J/g °C.
_____kJ

2007-03-01 08:07:20 · 1 answers · asked by Krazyk78 1

a) At equilibrium DGreaction = 0

b) Q > Keq when DGreaction < 0

c) When Q < Keq addtional products are formed

d) When Q = Keq the concentrations of all reactant and product species are equal to each other

e) When Q < Keq the amount of reactants will increase

2007-03-01 08:05:39 · 4 answers · asked by Beth F 1

because I know the formula C4H10= 3 isomers
It's between these two answers for me,

a. 1
b. 2

2007-03-01 07:37:34 · 5 answers · asked by xJessa Gurlx 1

For the reaction whose reactants and products are:



reactants: Fe2O3 (s) CO (g)


products: Fe(s) CO2 (g)



calculate the standard free energy change (kJ/mole) from the standard free energies of formation.


The answer depends on how you balance the equation.
For this question balance the equation using the smallest ratio of WHOLE numbers.

2007-03-01 07:23:33 · 3 answers · asked by Anonymous

Hi im currently doing an assignment on a CSI. I carried out a titration but im stuck on working out the molar equations.

I had a bench acid of HCl at 2mol, but i diluted 1cm3 of it with 9 cm3 of distilled water.

How do i work out how many moles were used?

2007-03-01 07:13:15 · 7 answers · asked by katie_orlandoarogorn 2

Concentrated HCl is 18 molar. The molecular weight of HCl is 36.

2007-03-01 07:11:07 · 2 answers · asked by cop126 1

any recommendation would be useful.
thanx!

2007-03-01 07:01:56 · 2 answers · asked by Anonymous

2007-03-01 06:59:18 · 8 answers · asked by Cloud Nine--Sez YAHH 2 tha hatas 4

Ok, I don't really consider myself a moron, but Chemistry may turn me into one............. :-)
I understand what a shell is but can someone explain subshells, and orbitals without using analogies like rooms? I want to learn the correct terminology. For instance, is s, p, d, and f, the subshells or are they orbitals? A link to a website would be fine too. I can't find anything. Thanks.
I'll give 10 points to the first person who can help me understand it.

2007-03-01 06:41:41 · 6 answers · asked by Anonymous

2007-03-01 06:39:23 · 2 answers · asked by jenrid 1

2007-03-01 06:09:15 · 3 answers · asked by Anonymous

2007-03-01 06:04:41 · 4 answers · asked by apocalypstick 2

Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-).

I am gettong 26.9 but am told i am getting wrong answer

2007-03-01 05:50:17 · 2 answers · asked by mitch v 1

I need to know whats different about nobel gases. something about particles?

2007-03-01 05:49:27 · 7 answers · asked by Anonymous

to 0.20 M NH3/0.17 M NH4Cl buffer solution

2007-03-01 05:49:07 · 1 answers · asked by mitch v 1

1) Cr203

2)HgS

2007-03-01 05:45:51 · 1 answers · asked by ceomillionman 1

2007-03-01 05:42:58 · 2 answers · asked by Anonymous

Trying to look at Henry's law constants and there seem lots of equations involved.

One involves vapor presure, the other partial pressure - just wondering what the differnce is

2007-03-01 05:39:29 · 5 answers · asked by Jon 2

Standard enthalpy change of combustion of butane is -2877kj mol-1. Calc the enthalpy of combustion in kj g-1

2007-03-01 05:37:35 · 2 answers · asked by Anonymous

For the reaction whose reactants and products are:



reactants: SO2 (g) O2 (g)


products: SO3 (g)



calculate the standard free energy change (kJ/mole) from the standard free energies of formation.


The answer depends on how you balance the equation.
For this question balance the equation using the smallest ratio of WHOLE numbers.

i think the balanced equation with whole numbers would be

2 SO2 (g) O2 (g) == 2SO3 (g)

and i know to figure out the delta G i need to subract the the standard free energies of formation of reactants from products.

so it would be

(2 x [SO3]) - (2 x [SO2)

O2 is not ocunted cause it's 0 i think...

BUT! what is the the standard free energies of formation for SO3 and SO2. i kinda dont have my book with me.

I searched the web. but couldnt find it...

HELP PLEASE!!!

2007-03-01 05:35:43 · 1 answers · asked by r.y 2

2007-03-01 05:35:36 · 9 answers · asked by riogrande_texas 1

I need to change something to its chemical name. How do I do that?

EXAMPLE:
Zinc + Sulfur --> Zinc Sulfide
====================
zn + s ----------> ????

Please fill in the ????. Also, please give me a quick summary on how to do this. Thank you in advance.

2007-03-01 05:34:36 · 2 answers · asked by Anonymous

For the reaction whose reactants and products are:



reactants: NO (g) H2O (g)


products: NH3 (g) O2 (g)


calculate the standard free energy change (kJ/mole) from the standard free energies of formation.

2007-03-01 05:31:04 · 2 answers · asked by Paul C 1

a) OF2


b) N3-


c) C2H4O


d) SO3 (central S)


e) H2O2

2007-03-01 05:26:34 · 3 answers · asked by rainingmonkeypoo 1