Number of results: 111,249
I'm sorry, but this is a re-post. I couldn't find the original post;-( so, does anyone have any suggestions for helping a student make a passing grade in college chemistry? She took it twice and didn't pass. Any suggestions would be appreciated. I thought maybe some websites ...
Thursday, August 2, 2007 at 5:53pm by jules
It may be but I picked these values out of a freshman college chemistry text.
Sunday, April 6, 2008 at 6:15pm by DrBob222
The indicator does not work well in an acid medium. NaHCO3 is used as a buffer to maintain an alkaline pH of about 9. For more information, see the link below: http://www.cforyourself.com/Overview/Primer/Chemistry/c_tests.html
Saturday, October 25, 2008 at 1:27am by GK
Hi there I need help with my chemistry homework There are two parts to the first question and i did the first part and i got E= -6.54E-18J. Part A) Calculate the energy (in J) of the photon associated with the transition of electron in He from n=2 to n=1. Part B) As the Value ...
Tuesday, February 10, 2009 at 1:11am by Shylo
college - chemistry
Are you sure you're in college? The directions for posting on this board clearly state that you should type your school subject on the School Subject line.
Thursday, February 12, 2009 at 5:05pm by Ms. Sue
Hi there, I need help on my homework for chemistry and I do not understand the step on how to work this problem out. Please help me with this problem: On a Sunday morning while having your breakfast you determine that you need about 2.95X10^(5)J to heat water for your tea in ...
Sunday, February 15, 2009 at 2:01am by Mai
college - chemistry?
Your school subject is NOT college.
Saturday, February 28, 2009 at 11:03pm by Ms. Sue
mole fraction O2 = partial pressure O2/total pressure mole fraction He = partial pressure He/total pressure. And you thought chemistry was hard.
Tuesday, March 9, 2010 at 12:41pm by DrBob222
Here is a site that explains the iodine clock reaction and all of its various forms. http://en.wikipedia.org/wiki/Iodine_clock_reaction The one you want to read about (read them all--all are interesting and contain interesting chemistry) is the persulfate one. The change in ...
Wednesday, March 31, 2010 at 12:34pm by DrBob222
This is a confusing point and most text books get it right; however, they often fail to CLEARLY define which system they are discussing. Here is the correct skinny. By definition, the anode is where oxidation occurs. That is the ONLY definition that counts. It is the ONLY one ...
Friday, April 2, 2010 at 4:40pm by DrBob222
The H of the acid neutralizes the OH of the base in traditional acid/base chemistry. H^+ + OH^- ==> H2O
Wednesday, April 14, 2010 at 10:37pm by DrBob222
Calculate the electrode potential of a copper half-call containing 0.05M Cu(NO3). E^0 Cu2+/Cu = 0.337 V College Chemistry - DrBob222, Tuesday, April 20, 2010 at 5:19pm E = Eo - (0.0592/n)log[(Cu)/(Cu^+2)] Substitute 2 for n and 0.05 M for Cu^+2 and 0.337 for Eo. Solve. Am I ...
Tuesday, April 20, 2010 at 6:18pm by L**
Perhaps I can get you started but that is it. Since the concns are not standard, first calculate the Eo value for each half cell but BOTH as reductions. For Zn^+ + 2e = Zn we have E = Eo-(0.0592/n)*log[(Zn)/(Zn^+2)] = -.763-(0.0592/2)*log[1/0.1)] = -0.793v. (check my work on ...
Wednesday, April 28, 2010 at 12:42pm by DrBob222
This is my first time taking chemistry and I am VERY confused on the steps foe this problem! Kilocalories to condense 82g of steam at 100 degress C, cool the liquid and freeze it at 0 degress C.
Friday, September 3, 2010 at 2:52pm by Eric
This is my first time taking chemistry and I am VERY VERY confused On the step involved to find out how many calories to warm 58mL of water from 10 degress C to 100 degress C and vaporize it at 100 degress C.
Friday, September 3, 2010 at 2:55pm by Eric
You can take a look at this post on simple stoichiometry and follow the steps. http://www.jiskha.com/science/chemistry/stoichiometry.html
Thursday, October 7, 2010 at 7:28am by DrBob222
Chemistry help needed.
Wednesday, October 20, 2010 at 12:22am by drwls
Which two did she get? For instance, surgery, radiation, chemotherapy, hormonal or immunotherapy may be used alternatively or together for maximum effectiveness. Why is this labeled college chemistry?
Wednesday, December 8, 2010 at 8:51am by bobpursley
Good Lord. This cannot be college chemistry...is reads like an online course substuting for college thinking. Societal implication? Transmutation (look that term up) of elements has been going on since the beginning of time (yes, that is 13 billion years ago). And your ...
Wednesday, December 8, 2010 at 8:48am by bobpursley
not sure I guess i put it down that way because im in college taking it.
Wednesday, December 8, 2010 at 8:51am by jane