Chemistry - March 2007

The problems calculate the mass of 3.62 x 10^24 molescules of glucose (C6H12O6) and determine the number of molecules of ethanol (C2H5OH)

Not having a scientific calculator sucks ><

2007-03-12 11:54:57 · 3 answers · asked by User84 4

help plz quickly?

2007-03-12 11:45:59 · 2 answers · asked by Shaili A 1

help quickly!!

2007-03-12 11:44:56 · 2 answers · asked by Shaili A 1

2007-03-12 11:44:12 · 3 answers · asked by Shaili A 1

a) NH3 : A Bronsted base, but not a Lewis base

b) OH - : A Bronsted base and a Lewis base

c) CH3COOH : A Lewis acid, but not a Bronsted acid

d) Cu 2+(aq) : A Bronsted acid, but not a Lewis acid

e) C6H6 : Both a Bronsted acid and a Lewis acid

2007-03-12 11:42:41 · 1 answers · asked by Gemini 2

2007-03-12 11:37:15 · 3 answers · asked by Ashley= 1

When reasonable algebraic methods fail, it is sometimes possible to make simplifying assumptions in order to solve equilibrium problems. This is possible only when K equilibrium is very small or very large, For Example:
2 CF4(g) + 4 H2O(g) = O2(g) + 8 HF(g) + 2 CO(g)
Kp = 2.1 x 10^-23 at 373K
CF4(g) and H2O(g) at partial pressures 2.0atm each are injected into an empty sealed vessel. Calculate the equilibrium partial pressure of HF(g).

2007-03-12 11:35:37 · 2 answers · asked by Anonymous

which of the following statements are true?


a) For an acid H-A : the greater the electronegativity of A, the stronger the acid HA

b) For an acid H-A : the stronger the H-A bond, the stronger the acid H-A

c) HBr is a stronger acid than HF

d) H2SO3 is a weaker acid than H2SO4

e) HBrO is a stronger acid than HClO

f) For carboxylic acids : the smaller the electronegativities of the atoms in the group bonded to the carboxyl group, the stronger the acid


im having a hard time finding answers in the book, if someone knows something i dont

2007-03-12 11:35:26 · 2 answers · asked by giggles9783 1

I'm having a lot of trouble with this question, which appears simple. The questions are of this form.

Find the pH when 90mL of 0.105mol/L HCl and 100mL of 0.116mol/L sodium acetate are combined.

Can anyone start me in the right direction, or solve this one, so I can continue with all of the rest?

2007-03-12 11:33:55 · 2 answers · asked by coulterphil 1

Answer any of the following questions, please:

1) If the actinides beyond uranium were found in the earth's crust, and uranium's half-life is 4.5 billion years, would the half-lifes of the other elements be more or less?

2) Why do photographers work in low light when they work with materials containing selenium?

POINTS TO BEST!

2007-03-12 11:26:17 · 1 answers · asked by dreamer 2

2007-03-12 11:22:48 · 4 answers · asked by kohlirosy 1

2007-03-12 11:21:23 · 3 answers · asked by Nicole F 2

If a 156-g of block of dry ice, CO2, is cublimed at 25 degrees celsius and 740 mm hg, what volume does the gas occupy?

2007-03-12 11:02:02 · 5 answers · asked by chelsea_cruz20 1

2007-03-12 10:59:32 · 3 answers · asked by Anonymous

using a buret? To what decimal place?

2007-03-12 10:44:08 · 5 answers · asked by Anonymous

What are the correct electron configurations for copper in its ground state, Cu+, and Cu2+ and why are both Cu+ and Cu2+ found in nature (aka why does it sometimes only lose one electron, and other times loses 2)?

Just something I've wondered about, and my chem teacher doesn't know the answer.

2007-03-12 10:30:56 · 3 answers · asked by podnaes 2

Everyone tosses this term around, POLYMERS. We know that polymers are long repeating hydrocarbon chains, that have a varity of uses, how ever what is the history of them? So here are the questions:

1) When and why did polymers become a popular replacement for natural products?

2) What has been their past uses?

3) What current research is being done in this feild?

4) What impact does this have on our society?

2007-03-12 10:23:10 · 1 answers · asked by Anonymous

HINT: find Kb from Ka of the conjugate acid
this was a hint we were given but i dont think i was given enough information to solve this problem

2007-03-12 10:19:22 · 1 answers · asked by Anonymous

It's for a science project people!!! Very important!!! Needed ASAP!!! ASAP people!!! ASAP!!!

2007-03-12 10:13:47 · 5 answers · asked by Anonymous

1)Which isotope defines the atomic mass unit, and how is the atomic mass unit defined?

2) What is the relationship between an atom's atomic mass and one mole of that atom?

3) How many molecules are in one mole of carbon dioxide, CO2?

4) Calculate the mass of one mole of carbon dioxide, CO2

Thanks

2007-03-12 10:12:08 · 1 answers · asked by happy days 1

2007-03-12 10:07:14 · 2 answers · asked by kayk 1

( both at 60degreesC)

benzene, C6H6
density= 0.877 g/ml
vapor pressure= 384 torr
formula weight= 78.1 g/mol


What is the mole fraction of benzene?

toluene, C6H5CH3
density = 0.867 g/mL
vapor pressure =133 torr
formula weight= 92.2 g/mol

which of the following will most readily dissolve in a mixture of toluene and benzene?
C2H5OH, PCL5, or HCCL3?

Does Benzene or Toluene have a higher boiling point?

2007-03-12 10:06:42 · 1 answers · asked by Tracey Lee ♥ 2

It's for a science project! needed ASAP people! ASAP!

2007-03-12 10:04:27 · 2 answers · asked by Anonymous

2007-03-12 09:55:00 · 4 answers · asked by Never More!! 5

thanks so so much! ♥

2007-03-12 09:53:02 · 3 answers · asked by Tracey Lee ♥ 2

2007-03-12 09:52:34 · 2 answers · asked by San Fran Kid 2

i'm guessing that there won't be a reaction since zinc is lower than magnesium in the reactivity series. Am i right?

2007-03-12 09:50:22 · 3 answers · asked by leyzeebum 1

The solubility of sucrose (common table sugar) at 70 degrees Celsius is 320 g/100 g H2O.
a. How much sucrose can dissolve in 200 g of water at 70 degrees celsius?
b. Will 400 g of sucrose dissolve in a teapot that contains 200 g of water at 70 degrees celsius? Explain.

2007-03-12 09:49:47 · 2 answers · asked by chelsea_cruz20 1

Thanks for the help in advance, and description of how you did it will also be helpful. Also to save you some time I do know that 0.408935393 is not the answer. Thanks for all the help.

2007-03-12 09:44:37 · 1 answers · asked by Saint L 2

Anyone know anything about Liquid paraffin? What is liquid paraffin, what is it's properties?

cheers,

2007-03-12 09:43:25 · 3 answers · asked by mAgIcK! 1