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

Two solutions, a 0.1% (m/v) albumin solution and a 2% albumin solution, are separated by a semipermeable membrane. (Albumins are colloidal proteins)

a) Which solution has the higher osmotic pressure?
b) In which direction will water flow initially between the solutions?

2007-11-19 02:34:41 · 1 answers · asked by Amy 1

Explain the effect of PH on ezymes activity ? I need this for my homework.

2007-11-19 01:45:13 · 4 answers · asked by LIZA 4

the molecules are five sided with three lines in them.
two of the molecules have the reversible arrow between them.
Two of the molecules have the resonance arrow between them.
Is reversible and resonance the systematic name?
Is the difference between them just the electron patterns.
Any help would be appreciated
Thanks

2007-11-19 01:44:50 · 1 answers · asked by dave k 1

A metal undergoes electrolytic reduction according to ne- + Mn+ ===> M. What current (in Ampères) must be provided to deposit the metal at a rate of 0.583 mol/hr if n = 2?

2007-11-19 01:31:33 · 1 answers · asked by kamer37078 1

Can an atom have more than one orbital shape (Im looking at the wave equation)? or is there only one orbital for the atom's electrons?

2007-11-19 01:21:07 · 1 answers · asked by Anonymous

I have lost the lab manual where it tells how to obtain the # of H2O molecules (X) (ex. CuSO4 - X H2O)
Details on experiment:
Weighed sample of hydrated copper sulfate crystals, added it to distilled water and while stirring , added 1 drop of sodium carbonate solution until a precipitate was visible. Then added drops of acetic acid while stirring until the precipitate disappeared.

titrated this with Sodium Thiosulfate solution with a potassium iodide indicator.

now i have all the experimental values of titration etc.. but no idea how to obtain the X (H2O)

thanks in advance for the help

2007-11-19 00:21:25 · 3 answers · asked by DJ-ICE 1

i do not know where to start..i know to calculate pH its teh negative log of the concentration of hydrogen ions, but how do you work out the concentration of hydrogen ions from what is given?

2007-11-19 00:16:55 · 1 answers · asked by fatygurrl 1

i have a problem in chemistry. how do i form compound formulas when an element has variable valencies.
eg: aluminium has valency 2 and 3 how will i know which valency to use
2. can we write ethanol as c2h5oh or ch3cooh.please explain in as much detail and include other web resource

2007-11-19 00:16:03 · 1 answers · asked by Anonymous

The equilibrium constant for the Haber reaction is 3.82 x 10-5 atm-2 at a certain temperature. If a reaction starts with 2.70 atm of H2 and 5.40 atm of N2 at this temperature, what will be the equilibrium pressure of NH3? Enter in atmospheres.


please explain - thank you

2007-11-18 23:54:41 · 1 answers · asked by guywithalotoflifeexperience 1

7. Given the following equations and DHo values, determine the heat of reaction (kJ) at 298 K for the reaction:

PCl3(g) + Cl2(g) à PCl5(g)

2 P(s) + 3 Cl2(g) à 2 PCl3(g) DHo/kJ = -542
2 P(s) + 5 Cl2(g) à 2 PCl5(g) DHo/kJ = -764



8. 4.90g of of ammonium iron (II)sulfate hexahydrate, FeSO4(NH4)2SO4*6H2O, was dissolved in 200.mL of acidified water. 20.0mL of the solution reacted completely with 12.6mL of potassium manganate (VII) (KMnO4) solution according to the balanced equation below. Calculate the concentration of the potassium manganate (VII) solution

5Fe2+ + MnO4- + 8H+ à 5Fe3+ + Mn2+ + 4H2O

2007-11-18 23:33:21 · 2 answers · asked by stylinpat 2

what is observed when sodium chlorate (v) is added to acidified potassium iodide?

ive looked and cant find it anywhere! please help

2007-11-18 23:09:00 · 1 answers · asked by Jess-Ica 1

The carbon dioxide from the combustion of 1.50 grams of C2H6 is collected over water at 25 degrees Celsius. The pressure of CO2 in the collection flask is 746 mm Hg, and the colume is 2.00 L.

2007-11-18 23:00:55 · 1 answers · asked by georgie0515 1

A gas mixture contains twice as many moles of O2 than N2. Addition fo 0.200 mol of argon to this mixture increases the pressure from 0.800 atm to 1.10 atm.

2007-11-18 22:56:00 · 1 answers · asked by georgie0515 1

2007-11-18 22:33:55 · 4 answers · asked by Anonymous

There are colourless solution of some salt in four separate test tubes. We plunge a piece of copper plate in each of the test tubes. Suppose the following salts were in the test tubes. Which solution will change to form a blue solution?

a) NaCl b) AgNO3 c) Cd(NO3)2 d) ZnSO4

2007-11-18 22:33:34 · 2 answers · asked by Anonymous

What is the difference between the Group A metals from the Transition metal?

2007-11-18 22:23:51 · 2 answers · asked by *+=trouble maker=+* 3

At 25°C, gaseous SO2Cl2 decomposes to SO2(g) and Cl2(g) to the extent that 12.5% of the original SO2Cl2 (by moles) has decomposed to reach equilibrium. The total pressure (at equilibrium) is 0.900 atm. Calculate the value of Kp for this system. ---I keep gettinng the wrong answer on this one. What are you getting?

2007-11-18 19:25:58 · 3 answers · asked by jazzyrhythms 3

My first aid class was asking and I couldnt tell them. I know this can happen but I dont know what sort of poisoning can produce the effect whereby the body becomes lethal to others

2007-11-18 17:37:26 · 1 answers · asked by Anonymous

How would I set this up and solve it?

2007-11-18 17:26:56 · 2 answers · asked by Jessca Hershlag 2

And can you show me how you solve it??

also this one too:

how many atoms are contained in 1.65 moles of copper metal?

2007-11-18 17:09:09 · 3 answers · asked by Anonymous

A sample of gas has a volume of 4.25 L at 25.6 °C and 748 mmHg. What will be the volume of this gas at 26.8 °C and 742 mmHg?

v = 4.299 is this right??

2007-11-18 17:06:41 · 1 answers · asked by Anonymous

29. Of a set of four quantum numbers, how many of these numbers can be shared by more than one electron of the same atom?

2007-11-18 15:38:51 · 3 answers · asked by rebeccapolsh333 2

a 6.35 L sample of carbon monoxide is collectedf at 55 C and 0.892 atm. What volume will the gas occupy at 1.05 atm and 59 C?
1. 6.10 L
2. 1.96 L
3. 5.46 L
4. 6.68 L
5. 4.82 L

2007-11-18 14:58:11 · 1 answers · asked by Raisa S 1

fedest.com, questions and answers