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March 28, 2015

Posts by Chem


Total # Posts: 116

chem help
Ammonia,is a weak base with a Kb value of 1.8x10^-5 .What is the pH of a 0.22M ammonia solution?
February 28, 2009

chem help
Ammonia,is a weak base with a Ka value of 1.8x10^-5 .What is the pH of a 0.22M ammonia solution?
February 28, 2009

chem help
You need to produce a buffer solution that has a pH of 5.08. You already have a solution that contains 10 mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The of acetic acid is 4.74.
February 28, 2009

chem
I DONT GET WHATS DONE.. DR.Bob22 - could u please explain this again..thank u
February 17, 2009

Chem
so wat do i do?
December 17, 2008

Chem
complete and balance the following decompition equations CaCO (heated) --> 3 please tell me how to do this and what exactly is suppose to be going through my head while doing this. I can balance these equations with no problem I just have no idea what to do...
December 17, 2008

Chemistry
How many atoms are there in 6.90 moles of sulfur (S)? Calculate the molar mass of a compound if 0.411 mole of it has a mass of 185 g. Know of any good sites that help answer these ? Or information on how to?
September 15, 2008

chem
E is NOT NOT NOT THE ANSWER!!!!
August 15, 2008

chemistry
Does the element sodium have properties in common with NaCl? Explain
February 11, 2008

chemistry
Which of the following subshells is correctly designated? a. 1f5 b. 3s3 c. 6f12 d. 4d11 e. 1p2
December 7, 2007

chemistry
Which of the following subshells is correctly designated? a. 1f5 b. 3s3 c. 6f12 d. 4d11 e. 1p2
December 7, 2007

Dan
N2 + 3H2 --> 2NH3 At 25°C (delta)Ho = -92.22 kJ and (delta)So = -198.53 J/K. Using this information, calculate the equilibrium constant for the reaction at 2.43x10^2°C. (R = 8.314 J/K) Apparently the way I'm doing it is wrong: I divide 198.53 by ...
November 17, 2007

BIOCHEMISTRY
calculate the pOH of 3X106-6M of HF
September 7, 2007

BIOCHEM
calculate the pH of 0.0076M KOH
September 7, 2007

chem!
Calculate the heat of reaction for the incomplete combustion of 67.0g propane producing carbon monoxide gas and water vapour. how would I go about and do this question? What are you studying? Do you know how to use the thermodynamic tables (delta Ho, etc). delta Hrxn = delta ...
May 14, 2007

question
whats relationship between temp and kinetic energy http://www.google.com/search?as_q=temperature+kinetic+energy+&hl=en&num=10&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=title&as_dt=i&as_sitesearch=&as_rights=&safe=images
March 7, 2007

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