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April 16, 2014

Search: Chem

Number of results: 14,206

AP Chem
I looked at the first four, they are right. Dont you work with someone on chem homework? Like a study group? That is a very effective way to work chem and physics problems.
Wednesday, November 19, 2008 at 11:22am by bobpursley

chem
I DONT GET WHATS DONE.. DR.Bob22 - could u please explain this again..thank u
Tuesday, February 17, 2009 at 12:10am by CHEM

chem help
ok thanks alot... the PartB asks for: What is the percent ionization of ammonia at this concentration?
Saturday, February 28, 2009 at 11:56pm by chem

CHEM organic chem
Responded above to a later repost.
Tuesday, November 13, 2007 at 6:18pm by DrBob222

gen chem
i tried that, apparently its not the right answer either =/.
Saturday, May 8, 2010 at 7:46pm by Chem

O.CHEM -> PLEASE CHECK!!
Thank you...good to know, but isn't there a "Dr.Russ" that works with Organic Chem??
Wednesday, March 12, 2008 at 9:48pm by K

chem
... This isn't in the right section. That's math, not chem. the answer though is, 23.
Wednesday, February 10, 2010 at 7:40pm by Nadia Samim

Chem
0.102 x 0.0821 x 273 / 1.0 what can i express this in the correct number of significant figures ?@_@
Wednesday, August 29, 2012 at 4:51am by Chem ):

Chem
maybe try using P1V1/n1T1 = P2V2/n2T2 ... im in chem too...
Saturday, February 27, 2010 at 1:16am by fellow student

chem
The answer on mast chem is 279 if you have 230 grams instead of 200.
Monday, February 15, 2010 at 4:46pm by Anonymous

G-chem/org. chem=>Dr. Bob222
I mean are setups differ for part 1
Friday, February 8, 2013 at 5:58pm by Devron

chem help
sorry the 2nd question is the right one
Saturday, February 28, 2009 at 11:56pm by chem

gen chem
yes, I figured that one out. Thanks so much for the help!
Sunday, May 9, 2010 at 3:42pm by Chem

organic chem
cadaverine is AKA pentane-1,5-diamine
Tuesday, April 26, 2011 at 5:18am by chem

organic chem
cadaverine is AKA pentane-1,5-diamine
Tuesday, April 26, 2011 at 5:18am by chem

chem
How to find the %(W/V) of 134mL of a 0.610 M solution of Mg(OH)2
Thursday, February 16, 2012 at 9:00pm by chem

chem
sorry read it wrong, doing this now in chem
Tuesday, March 19, 2013 at 6:02pm by Amanda

chem PLEASE HELP
I am very sorry. Chem is just not my thing and i looked in my notes the book and everything
Thursday, April 14, 2011 at 7:40pm by Sal

chem
ahh i hate chemisty, i'm kindof slow too and everything confuses me in chem.!! i feel the same way as you:)
Thursday, May 29, 2008 at 9:59pm by bethany

chem
Sarah, 4.70 is what you get when you do the -log (Ka)
Monday, April 4, 2011 at 1:24am by chem

Chem
1. 7.95 g 2. 7.956 g 3. 7.96 g 4. 7.960 g 5. 8.0 g 6. 8.00 7. none of the above Which is more the right choice....It can't be 7,6,5 for sure....But I thought it was 3. It's not 2.
Friday, February 8, 2008 at 3:13pm by Chem Help!!

Chemistry
so the first one is wrong too hmmm ! yeah ur reasoning makes sense ... i will ask my chem teacher too
Saturday, November 28, 2009 at 8:14pm by Chem Lover

gen chem
what must be the current in amperes to plate out 7.437g of Al from am aqueous solution of Al3+ in 5.4x10^2 minutes?
Saturday, May 8, 2010 at 6:56pm by Chem

G-chem/org. chem=>Dr. Bob222
I just looked at Dr. Bob222's post for when you initially posted this question and the setup that I gave you for part 1 differs from the setup that he gave you for part 2. I will let him resolve that for you since he has more experience in G-chem then I do, and he is probably ...
Friday, February 8, 2013 at 5:58pm by Devron

gen chem
what is "n" and thank you so much for all the help!
Saturday, May 8, 2010 at 7:46pm by Chem

gen chem
yes, it wants an actual value
Sunday, May 9, 2010 at 3:17pm by Chem

gen chem
that works! thank you so much!!
Sunday, May 9, 2010 at 3:42pm by Chem

chem help
see the short paragraph and visual titled Predicting ion charges. http://antoine.frostburg.edu/chem/senese/101/atoms/
Saturday, November 24, 2007 at 7:59pm by bobpursley

Chem
Chemistry - A mixture of chromium and zinc weighing .362 g was reacted with an ... chemistry - Plastic articles can be chromium-plated by coating them with thin ... chem - Zinc dissolves in acid according to the balanced equation. Zn(s)+ 2H(aq... chem - Zinc dissolves in acid ...
Sunday, February 25, 2007 at 5:26pm by Anonymous

Chem
Chemistry - A mixture of chromium and zinc weighing .362 g was reacted with an ... chemistry - Plastic articles can be chromium-plated by coating them with thin ... chem - Zinc dissolves in acid according to the balanced equation. Zn(s)+ 2H(aq... chem - Zinc dissolves in acid ...
Sunday, February 25, 2007 at 5:26pm by Anonymous

Chem
Chemistry - A mixture of chromium and zinc weighing .362 g was reacted with an ... chemistry - Plastic articles can be chromium-plated by coating them with thin ... chem - Zinc dissolves in acid according to the balanced equation. Zn(s)+ 2H(aq... chem - Zinc dissolves in acid ...
Sunday, February 25, 2007 at 5:26pm by Anonymous

gen chem
2NO <-> N2 O2 initial .116 0 0 change -x +x +x equil .116-x x x
Sunday, May 9, 2010 at 3:42pm by Chem

Intergated chemistry/physics
time=distance/velocity. This is a very odd question for "integerated" chem/physics. Where is the chem?
Wednesday, October 3, 2012 at 1:53pm by bobpursley

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?
Saturday, February 28, 2009 at 11:56pm by chem

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?
Saturday, February 28, 2009 at 11:56pm by chem

gen chem
yes I did, but im still not getting the right answer. I got .1136 which is not the correct answer.
Sunday, May 9, 2010 at 3:42pm by Chem

Chem
4.30 grams of NH4Cl is added to 14.5 grams of water. Calculate the molality of the solution
Monday, January 20, 2014 at 6:48pm by CHEM

chem: study of kinetics
he gave us an example of what the slope might be in class and it was -1.3x10^2 but my slop is completely different, was i supposed to do calculations? or just get the one from excel? what do i put in the 2 blanks?
Saturday, October 16, 2010 at 2:20pm by chem

ap chemistry
I agree on the tutor. Also, get another text (college used book store) to see the same material in differing words. On the ap chem board exam, nationally, most do not do well. I have to be honest, most ap chem students need to retake college chem if for nothing else, the lab ...
Sunday, November 4, 2012 at 4:07pm by bobpursley

gen chem
what would Qc be if the pressure of the container decreased by a factor of 2.417 for the following reaction? 4Hcl(g)+O2(g)<-->2Cl2(g)+2H2O(g) Kc=13.298 @ 753K
Sunday, May 9, 2010 at 3:17pm by Chem

In your opinion=> has it payed off for you Dr.Bob? (I need some advice)
I don't know where to start but I was thinking of changing my major to chemistry but that would require me to go to another school since mine doesn't have a chemistry major. This is rather ironic since they have all the major chem classes needed to get a chemistry degree and I...
Tuesday, March 25, 2008 at 9:50pm by ~christina~

chem
The larger an atom the farther the electrons are away from the nucleus; therefore, the easier it is to distort them. Here is a site that talks about that. http://www.chem.purdue.edu/gchelp/liquids/disperse.html
Friday, November 28, 2008 at 4:49pm by DrBob222

chem
You have to subtract the water vapor pressure at 25C from 760Torr. http://intro.chem.okstate.edu/1515sp01/database/vpwater.html
Tuesday, February 2, 2010 at 10:41pm by bobpursley

gen chem
E cell is not given, just the E0 cell which is -1.133V
Saturday, May 8, 2010 at 7:46pm by Chem

physics vs. Chem
Doesnt physics seem to be harder than chem? Anyone?
Sunday, October 24, 2010 at 2:28pm by Kavi

chem- drbob222 please help
my original question was: how do i figure this out?? How much heat does your body lose when 2.46 g of sweat evaporates from your skin at 25C? chem - DrBob222, Tuesday, February 22, 2011 at 10:52pm q = mass water x delta Hvaporization. chem - Rebekah, Wednesday, February 23, ...
Wednesday, February 23, 2011 at 5:49pm by Rebekah

Chem 2
Sorry my friend Barbie and I are doing are chem h.w. together. We each posted a question and since were using the same computer the last name always stays saved in the page...sorry I forgot to change it. It
Wednesday, February 27, 2008 at 3:28pm by Amanda

Chemistry
I'm lost!!! Not sure if I'm just losing concentration after 50 chem problems or losing my mind with 3 kids running around still and a chem exam at 8am!!!
Friday, March 29, 2013 at 12:15am by Ryan Curry

Chem
What causes dispersion forces? Disperson forces are caused by an unsymettrical distribution of charge in the molecule, causing a net electric force. http://www.chem.purdue.edu/gchelp/liquids/disperse.html
Tuesday, January 9, 2007 at 6:46am by Dennis

science
Thank you for using the Jiskha Homework Help Forum. Hopefully the following will assist you: 1. (Broken Link Removed) 2. http://en.wikipedia.org/wiki/Polymer_chemistry 3. http://chem.chem.rochester.edu/~chem421/famous.htm
Tuesday, April 22, 2008 at 6:06pm by SraJMcGin

Chem Help!
I really need help with this question for my chem H.W. 1) On a summer day in Breckenridge, Colorado, the atmospheric pressure is 525 mm Hg. What is this air pressure in atmospheres? (round to the hundredths place) atm
Thursday, April 10, 2008 at 12:34pm by Lisa

HARD CHEM QUESTION- any help appreciated
Have you ever heard of ICE charts? http://www.chem.purdue.edu/gchelp/howtosolveit/Equilibrium/ICEchart.htm
Monday, May 13, 2013 at 8:48pm by bobpursley

chem
Al is an element. The others are compounds. Consult this site for solubility. http://www.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
Monday, October 8, 2007 at 9:39pm by DrBob222

chem:ionic equations
Here are a set of rules for solubility. Memorize them. http://www.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
Tuesday, November 27, 2007 at 12:15am by DrBob222

gen chem
what is the pK (=-logK)at 25C for the reaction below? Cl2(g)+6H2O(l)+5Cu2+(aq)<-->2ClO3-(aq)+12H+(aq)+5Cu(s) E0=-1.133V
Saturday, May 8, 2010 at 7:46pm by Chem

CHEMISTRY
AMMONIA GAS OCCUPIES A VOLUME OF 5.00 L AT 4DEGREES C AT 760 TORR. FIND ITS VOLUME AT77DEGREES C AND 800 TORR
Wednesday, July 7, 2010 at 10:44pm by CHEM CHEM

High school AP chem
The solubility of Mn(OH)2 is 3.04 x 10^-4 gram per 100 ml of solution . A) write the balanced chem equation for Mn(OH)2 in aqueous solution B) calculate the molar solubility of Mn(OH)2 at 25 degrees celcius C) calculate the value of the solubility product constant, Ksp, for Mn...
Tuesday, April 1, 2014 at 1:52pm by Chem review question

chemistry
http://dwb4.unl.edu/Chem/CHEM869J/CHEM869JLinks/www.chem.ualberta.ca/courses/plambeck/p101/p01182.htm
Monday, March 8, 2010 at 1:54am by DrBob222

Chem
Christina, Hello I'm Lisa. Thank you for your help you provided for my chem assignment. I really appreciate it! Have a nice day!
Tuesday, March 11, 2008 at 6:29pm by from Lisa to Christina

Chem
And ff is what? Your answers can be found here. http://www.chem.tamu.edu/class/majors/tutorialnotefiles/trends.htm
Monday, December 16, 2013 at 7:48am by DrBob222

Dr.Bob222 Chem
I believe that you are correct because you have more experience in G-chem then I have. But how does doubling the reaction rate double the k value? Isn't k just a constant for a particular reaction?
Friday, February 1, 2013 at 10:15pm by Devron

College Chem 1010
Here is a simplified list of solubility rules. http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html A) Ca(NO3)2 B) FePO4 C) NH4OH D) Na2SO4 E) NaCl
Sunday, April 15, 2012 at 10:48pm by DrBob222

gen chem
At 2273K, equilibrium constant for the reaction 2NO(g)<->N2(g)+O2(g) Kc=2.4x10^3 What would be equilibrim concentration of N2, if initial concentration of NO was 0.1160M?
Sunday, May 9, 2010 at 3:42pm by Chem

chem
if a car produces 81g of {\rm CO_2}, how many grams of {\rm O_2} are used up in the reaction? the complete chem reaction is C2H6O+3O2--->2CO2+3H2O
Friday, October 19, 2012 at 8:20am by tracy

chem
so i posted this question yesturday and got some help. which is the stuff below. can you look at the last thing i said which was the answer i got by doing what DrBob222 said to do and tell me if its correct.(the question is the first section) thanks chem - hannah, A salt ...
Wednesday, November 10, 2010 at 4:18pm by hannah

Chem answer check
PbI2 is an insoluble salt. See the solubility rules. http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
Monday, February 22, 2010 at 5:12pm by DrBob222

Chem
We are unable to draw diagrams on these boards. However, here is a site that gives the structure for #1 together with the resonance structures. If I find the structure on the web for #2 I shall post it. http://www.chem.ucsb.edu/~genchem/Chem1CS03/examanswers/final_white.pdf
Monday, September 7, 2009 at 12:07pm by DrBob222

college chem
http://www.chem.uiuc.edu/chem103/aluminum/AlIntroduction.htm
Tuesday, June 26, 2012 at 1:36am by bobpursley

Chem 1
Write a chemical equation that shows how acid rain H2SO3 was produced from SO2 gas and water in a zip sealed bag? My chem. teacher never explained how to do this and I have several other questions on this type of subject. If you could help me out it would help me tremendously...
Tuesday, April 9, 2013 at 8:00pm by Jess

Chem
You need to know the solubility rules. Here is a simplified set. http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
Sunday, February 13, 2011 at 7:22pm by DrBob222

sand bath (chem)
what are disadvantages and advantages of using a sand bath to heat something in chem?
Sunday, October 21, 2007 at 7:31pm by ~christina~

Chem help
Here is a site that give you some insight on lattice energy. http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch7/lattice.html Yes, paramegnetic species will be those that have unpaired electrons. s and p.
Wednesday, November 28, 2007 at 1:01pm by DrBob222

chem
Here is a simplified set of solubility rules. http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
Thursday, February 10, 2011 at 11:49pm by DrBob222

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...
Wednesday, December 17, 2008 at 7:09pm by Chem

Chem
I Googled Millikan electron and found this. http://chem.ch.huji.ac.il/history/millikan.html
Thursday, November 15, 2007 at 2:53pm by Ms. Sue

chem
What is another name for cardamist? Please write the formula and a link to its structure. See http://antoine.frostburg.edu/chem/senese/101/consumer/faq/what-is-cardamist.shtml
Sunday, September 4, 2005 at 5:04pm by Nisar

Chemistry
As for chem I vs chem II, I think you are expected to know the material from I going into II. And this is another of the problems with the test. How many profs around the country start and stop the semester with the same number of topics and to the same depth?
Thursday, April 19, 2012 at 8:27pm by DrBob222

9th grade chem
delta T=iKm K=1.853C/m find delta T. (hint: m=mol glucose/kg H2O)Then subtract that value from 0 degrees Celsius. http://library.thinkquest.org/C006669/data/Chem/colligative/colligative.html
Tuesday, December 14, 2010 at 6:53pm by TutorCat

chem
E is NOT NOT NOT THE ANSWER!!!!
Friday, August 15, 2008 at 6:25pm by Chem

Chem
so wat do i do?
Wednesday, December 17, 2008 at 7:09pm by Chem

chem
http://www.rpi.edu/dept/chem-eng/Biotech-Environ/EQUILIBRIUM/logconc.htm Click on the link at the bottom "explanation of why the lines are linear".
Wednesday, July 4, 2012 at 4:19pm by DrBob222

Chem - DrBob222 & drwls
Just want to say thanks to you guys for the help you gave me during the last couple of months. It was all in preparation for the National Chemistry Test and I just received word I have been selected to be in the running for the National Chem Team. Thanks again.
Monday, October 8, 2007 at 12:12am by Vic

Advice...about chemistry degree Dr.Bob
Based on the question topic posted by Britney below titled:In your opinion (your answer to this reminded me of something) (I posted the same thing there but I thought it was improper to piggyback on that post so I posted this under a new topic) I don't know where to start but ...
Tuesday, March 25, 2008 at 11:20pm by ~christina~

O.CHEM -> PLEASE CHECK!!
Our regular chemist expertm DrBob222, is taking a vacation for a week, so it is quite likely that no one will be available to help you with your organic chem questions. Thank you for using the service, and I hope that you will continue to do so. Perhaps another person using ...
Wednesday, March 12, 2008 at 9:48pm by drwls

Gen Chem II
Thanks for the information Dr. Bob. Would you be able to work it out so that I can actually see the steps with the numbers and follow from there. The question was on Vitamin K from Sunday at 2:44pm which you answered at 3:45pm. Thanks again. I am looking to get a tutor since I...
Monday, February 11, 2013 at 5:28pm by Nefret

math chem
Marie posted the same kind of question with the same funny symbols but corrected. Look for the response above under chem/math by Marie.
Monday, January 24, 2011 at 11:36pm by DrBob222

chem
HCl Read this: http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch11/conjugat.php
Monday, April 25, 2011 at 11:45pm by drwls

math/chem
http://www.chem.tamu.edu/class/fyp/mathrev/mr-da.html
Saturday, October 22, 2011 at 10:20pm by Ms. Sue

gen chem
if the voltage of the cell is 2.0898V at 25C when [Mg2+] = 0.1945M and the pressure of H2 = 1.00atm, what is the pH? E0=2.3700V Mg(s)+2H+(aq)<--> Mg2+(aq)+ H2(g)
Saturday, May 8, 2010 at 7:10pm by Chem

chem 110
when1.015 grams of calcium carbonate is reaced with 20.440 grams of hydrochloric acid the resulting mass is 21.128grams. what mass of gaseous product was released.
Monday, December 16, 2013 at 10:34pm by chem 110

chem
i know that i am slow here at chem but how do i find out the limiting reactant... i think it is the HCl but i am not sure. then how to do the rest of the problem. i have a few others like this problem. if you have time can you help me work it step by step?
Saturday, December 1, 2007 at 2:29pm by mel

science (chem)
I'm actually doing a homework assignment where you have to draw the structure into program...it's killer..I drew it with the double bond and the computer said incorrect. It's for organic chem. I'll try the triple bond and see what happens...I don't like drawing on the computer...
Friday, August 31, 2007 at 10:01pm by ~christina~

science (chem)
I'm actually doing a homework assignment where you have to draw the structure into program...it's killer..I drew it with the double bond and the computer said incorrect. It's for organic chem. I'll try the triple bond and see what happens...I don't like drawing on the computer...
Friday, August 31, 2007 at 10:01pm by ~christina~

chem
Here is a link to the activity series of metals and their ions. Any metal will displace any metal ION BELOW it in the series. http://www.files.chem.vt.edu/RVGS/ACT/notes/activity_series.html
Saturday, May 28, 2011 at 12:20pm by DrBob222

Chem- bobpursley
What mass of protons would be required to just neutralize the charge of 1.5 g of electrons? my teacher said .0015kg times 1e-/.00091e-27kg times 1pt/1e- times 1.67262e-27 over 1 p chem - bobpursley, Tuesday, September 21, 2010 at 6:48pm That is what I would do also. But I ...
Tuesday, September 21, 2010 at 8:39pm by Sara

chem
A solution is made by mixing 20.0 mL of toluene C6H5CH3d=0867gmL with 150.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are ____M and _____m.
Thursday, August 14, 2008 at 8:52pm by Chem help

CHEM organic chem
i am really confused! i am doing the production of ethene from fractional distillation and i understand the whole concept of it what i don't get is how i can write a balanced eqn to show how ethene can be produced from C14H30 (tetradecane?!) i did C14H30 ------> C7H14 + ...
Tuesday, November 13, 2007 at 6:18pm by AllyKat

CHEM organic chem
i am really confused! i am doing the production of ethene from fractional distillation and i understand the whole concept of it what i don't get is how i can write a balanced eqn to show how ethene can be produced from C14H30 (tetradecane?!) i did C14H30 ------> C7H14 + ...
Tuesday, November 13, 2007 at 8:16pm by AllyKat

Chem
Another site. http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
Saturday, July 11, 2009 at 8:24am by DrBob222

Chem
You do not state the physical state of the oxygen. If it is a gas jar of oxygen then this site might help. It is a good site for MSD information. http://msds.chem.ox.ac.uk/OX/oxygen.html
Wednesday, October 5, 2011 at 3:39am by Dr Russ

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