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April 23, 2014

Search: chem/DrBob22

Number of results: 14,121

Chem
thanks drbob22, much better explanation!
Friday, October 14, 2011 at 9:16pm by Anonymous

Drbob22
Trust me Drbob22 if I would have known the answer I wouldn't have posted the question. That's obvious!
Tuesday, October 9, 2007 at 5:12pm by Anonymous

chem/thank you DrBob22
thank you so much....your good, I wish you be my teacher I be passing my class with no problem....
Thursday, December 16, 2010 at 11:58am by julia

chem /Sue
I'm sorry...I'm not using his name..I know his one of the best tutors, his help me a lot in understanding chemistry..I wrote like that so he could read my question..and check my work...sorry Ms. Sue...all i was trying to do is to direct the question for Drbob22...sorry once again
Monday, November 15, 2010 at 5:49pm by julia-Drboob22

chemistry
DrBob22 PLEASE hELP!!!!!!!!!!!!!!!!!
Monday, March 12, 2012 at 4:43pm by jenny

chemistry 101
That didn't help drbob22
Thursday, September 5, 2013 at 3:58pm by Anonymous

DrBob22
I think I partially answered that.
Wednesday, April 29, 2009 at 10:56pm by DrBob222

chemistry
WTH did DrBob22 just say?
Tuesday, October 19, 2010 at 11:48am by dina

Chemistry
Thank you DrBob22. :) But for #1, am I looking for dGo for H2(g)?
Thursday, March 27, 2014 at 1:31am by Airin

DrBob22
Can you check my answer in the last boiling point topic I posted? Thanks.
Wednesday, April 29, 2009 at 10:56pm by Chopsticks

Chemistry
to DrBob22 .... what volume fo water would u use?
Friday, October 22, 2010 at 9:15am by Sam

To DrBob22
are we supposed 2 divide something after we solve the equation
Thursday, May 3, 2012 at 7:51pm by Candy

DrBob22
We have never learned the formula (P1V1/T1) = (P2V2/T2) Is that the same thing as P1V1T2=P2V2T1 ??
Wednesday, March 25, 2009 at 12:48am by Chopsticks

Chemistry
@DrBob22 I think you would be of more help if you actually answered the question instead of just giving the equation in all your posts.
Wednesday, November 2, 2011 at 7:40pm by Greg

Physical Science [DRBOB22 PLEASE CHECK]
Btw Dr.Bob, the answer to #3 is actually D, what I drwls and I said. Just letting you know ;) -MC
Saturday, May 9, 2009 at 11:17am by mysterychicken

Science
What role does the sun play in the formation of tides? I read the article that you posted DrBob22, but I want it in short terms, and am unable to put it in them, please help.
Wednesday, February 10, 2010 at 10:24pm by Sara

math
@ Ms. Sue, Thank you for your answer. @ Drbob22, Thank you for your thoughts. The question was produced by my instructor and I'm sure your right, it probably isn't the best question. I have typed it as it was written.
Sunday, December 27, 2009 at 4:13pm by Kay Kay

chem/DrBob22
consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the...
Monday, November 15, 2010 at 6:23pm by julia

DRBOB22 I REPLIED TO THE OTHER QUESTION!!
Responded to the original post and follow up at original site. If you have trouble finding it I can come back and paste the asnwer here. !
Wednesday, November 1, 2006 at 4:17pm by DrBob222

Drbob22
I'm sure you are correct. But instead of just giving you the answer, which I'm sure you don't want us to do, tell us what your trouble is so we can help you understand it.
Tuesday, October 9, 2007 at 5:12pm by DrBob222

Repost Chemistry for GK
This is the lab (determination of gas constant) I provided the link in the previous post. I'm not sure if you used the volume I obtain. Can you explain to me how to find the molar volume? Is what I did correct or is what DrBob22 did corect? Thanks!
Friday, July 11, 2008 at 12:11pm by Anonymous

Chemistry
Sorry, it should read 10L, not 100L and 9L not 99L. Also, DrBob22 is right you can boil/distill 50mL of water, but only if they do not have the same boiling point, but the answer is to add 9L not 10L.
Thursday, January 17, 2013 at 9:17pm by Devron

Chemistry
I don't know how to do the last algebra part that DrBob22 did not explain. I have not taken algebra since 2 years ago it would have been helpful to see... I haven't found out the math part anywhere!
Monday, March 5, 2012 at 10:52pm by Kassandra

Chemistry
DrBob22 please help with the pH. I am not sure if I would use pKa=-logKa=-log(1.9*^-5)=4.74 or do I use [H3O]= 10^-pH =.0040=10*^-ph
Sunday, March 25, 2012 at 12:30pm by Mary

chemistry
drbob22 I think the reason you are getting a negative number instead of the positive you need to find the log is because you put your A and B in the places. Try inverting them. I'm sure you will get a positive. I followed your instructions to a Tee and never came up with a ...
Monday, February 4, 2008 at 8:54pm by Shameca

algebra
Actually, DrBob22, I disagree. neither The second choice is almost correct. It is missing a minus sign. It should be: 9b^2-16b^2 Why? (-4)^2 (b)^2 => 16b^2 remember, you're square both the coefficient and the variable. note: the minus sign is not in the parenthesis, so you ...
Monday, July 14, 2008 at 10:22pm by Anonymous

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

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.43 kg m-3. Under these conditions the total surface area of the balloon is 0.68 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 10:33pm by Stud

DrBob22
Suppose that 120.mL of argon is collected over water at 25C and 780.0 torr. Compute the volume of the dry argon at STP. Would this be involved with Charles law? DrBob11: (P1V1/T1) = (P2V2/T2) Don't forget to use T in Kelvin. Subtract the vapor pressure of water from the total ...
Wednesday, March 25, 2009 at 12:48am by Chopsticks

DrBob22
Sure. (P1V1/T1) = (P2V2/T2) = P1V1T2 = P2V2T2. That's the general gas law. It becomes Boyle's Law if you keep T constant (just cover up T1 and T2 and you're left with P1V1=P2V2). Or it becomes Charle's Law if P is constant (cover up P1 and P2 and it becomes V1T2=V2T1). And if ...
Wednesday, March 25, 2009 at 12:48am by DrBob222

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

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

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
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 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 organic chem
Responded above to a later repost.
Tuesday, November 13, 2007 at 6:18pm 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
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
sorry read it wrong, doing this now in chem
Tuesday, March 19, 2013 at 6:02pm by Amanda

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

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

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

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

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- 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
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

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
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

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

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

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

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

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

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

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

Chemistry
Sorry DrBob22, I wasn't sure if you saw my last post. But, I am still a little confused. Here's the info: Antacid Brand: Life Concentration of HCl: 0.1845 M Concentration of NaOH: 0.1482 M Trial 1: 1.Mass of Table: 1.2173g 2.Volume of HCl added: 75.0 mL 3.Milliomoles of HCl ...
Monday, October 18, 2010 at 10:04pm by Akhed-To DrBob222

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
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

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

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
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

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 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
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

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
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

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

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

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

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

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
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

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

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~

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
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

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

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
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

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 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
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
You need to know the solubility rules. Here is a simple set of rules that will cover most (not all) salts. http://www.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html For example, NH4Cl + H2SO4. the possible combinations, if you look at a double replacement reaction, is HCl + ...
Wednesday, June 25, 2008 at 2:57pm 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

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

Chem
One reason is that in the gaseous state the molecules are so far apart that there is little attraction between them. At high pressures, it forces the molecules closer together (smaller volume), there is more attractions, and London forces play a bigger role in the liquifaction...
Monday, July 27, 2009 at 12:44am by DrBob222

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

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

Chemistry
3 NO2(g) + H2O(g) 2 HNO3(g) + NO(g) At constant temperature and pressure, what is the maximum volume, in liters, of HNO3(g) that can be made from 10.39 L of NO2(g) and 15.53 L of H2O(g)? That is the entire question and this is AP Chem but gas stoichiomatry from regular chem. I...
Monday, June 18, 2012 at 8:55pm by Nihar

science (chem)
an addition to this is Why doesn't my lab in organic chem use plastic pipettes? Is it going to react with the organic solvent if you do use it instead of glass? And it's kind of annoying that the liquid in the pipette has a tendency to go into the bulb while I'm transfering ...
Sunday, September 9, 2007 at 10:16pm by ~christina~

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