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April 20, 2014

Search: Chemistry - DrBob222 please check and help

Number of results: 199,270

DrBob222 please check
DrBob222 please check my physics question posted at 8:55pm. The subject is drwl please check. I am not getting a response from drwl. Thanks! Mary DrWLS is not on right now. My physics is too poor to trust my answers. Bob Pursley is smarter than I am; he does physics, math, and...
Tuesday, February 27, 2007 at 9:24pm by Mary

Where is DrBob222?
Hey does anyone know when DrBob222 comes on here, cause I have a lot of chemistry questions which I need him to check. Thanks.
Monday, October 11, 2010 at 7:42pm by Anonymous

Chemistry please check
Thanks DrBob222!
Friday, February 15, 2008 at 11:35pm by Mary

DrBob222 : Chemistry HElp...Please Check
thank*
Tuesday, October 21, 2008 at 9:48pm by Sara

DrBob222 : Chemistry HElp...Please Check
Oh okay that you...and yes i meant molarity
Tuesday, October 21, 2008 at 9:48pm by Sara

Chemistry(Please check)
1) The Ka for acetic acid is 1.8e-5. What is the pH of a 3.18M solution of this acid? I did 1.8e-5 = x^2/3.18 x=sqrt 1.8e-5 X 3.18 = 7.56e-3 pH=-log(7.56e-3) = 2.12 The pH is 2.12 2) At 25 degrees celsius, the pH of a 1.75M NaCN solution (the Ka for HCN is 4.0e-10) is ? 4.0e-...
Monday, April 2, 2012 at 3:47pm by Hannah

DrBob222
please check my answer
Monday, March 31, 2014 at 3:37pm by Helen

Chemistry
DrBob222, I don't know how to solve this problem either. And yes, this is the question for this problem. I even double check it. Please help. Chloroform (CHCL3) has a normal boiling point of 61 'C and an enthalpy of vaporization of 29.24 kJ/mol. What is the value of delta Gvap...
Tuesday, April 30, 2013 at 3:52pm by Chloe

DrBob222 please check
When pH = pKa - 1, (A^-)/(HA) = 0.1 BECAUSE log 0.1 = -1.
Monday, September 3, 2012 at 8:43pm by ron

Chemistry
The following thermodynamic data was obtained for an unknown compound. Delta Hvap = 31.3 kj/mol and Delta S Vap= 79.7 kj/mol .Calculate the normal boiling point of this compound in Celcius.. Thank you! Chemistry - DrBob222, Tuesday, April 30, 2013 at 12:31am dG = dHvap - ...
Tuesday, April 30, 2013 at 1:25am by Chloe

Chemistry(Please help, thank you)
I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the following equation. 2S2O3^2- + I2 -> 2I^- + S4O6^2- Chemistry(Urgent, please help) - DrBob222, Sunday, February 26, 2012 at 9:47pm If you know the ...
Monday, February 27, 2012 at 11:10pm by Hannah

Chemistry(Please respond)
Calculate the pH of an aqueous solution of 0.15 M potassium carbonate. I know that pH = -log(H30+) but I am not sure how to start this problem. Chemistry(Please help) - DrBob222, Saturday, April 14, 2012 at 11:09pm Hydrolyze the CO3^2-. CO3^- + HOH ==> HCO3^- + OH^- Do an ...
Wednesday, April 18, 2012 at 5:21pm by Hannah

Chemistry
DrBob222 please help?
Friday, March 9, 2012 at 9:17pm by Jerry

DrBob222
I really need help on these chemistry problems. Can you please help me work them. Please?
Monday, April 5, 2010 at 9:27pm by Help please

Chemistry
Dear DrBob222 !!! Would you please help me answers the question that I posted. I really don't understand and need help! Please, Thanks
Friday, February 19, 2010 at 12:56am by Ashley

11th grade chemistry
thank you so much drbob222. u are a genius. could you check out my physics questions too?
Monday, November 8, 2010 at 1:09am by help

chemistry
please show me how to do it DrBob222
Thursday, December 8, 2011 at 5:38pm by jenny

chemistry
DrBob222 could you please answer!!!!!!
Wednesday, March 14, 2012 at 6:47pm by Kelsey

Chemistry(Please check)
. Ksp for Fe(IO3)3 is 10-14. Two solutions, one being iron(III) nitrate and the other being sodium iodate, were mixed. At the instant of mixing, [Fe3+] = 10-4M and [IO3-] = 10-5M. What happens? My answer is that a precipitate forms because Qsp > Ksp. Would you agree? ...
Monday, April 9, 2012 at 9:51pm by Hannah

To DrBob222(Please check Chem)
(This homework question has been removed due to a copyright claim submitted by K12 Inc.)
Thursday, June 21, 2012 at 11:34am by Liz

Chemistry
DrBob222 explain better please
Thursday, November 29, 2012 at 12:07am by Anonymous

DrBob222 help me!!
Please I posted a chemistry question but I havent gotten any answer back please help me, sorry for having so little patience answered below.
Wednesday, May 23, 2007 at 10:30pm by Fabiola

Science
Please post this again with Chemistry as your school subject. DrBob222 is one of our top chemistry tutors and he may answer your question.
Thursday, November 7, 2013 at 4:15pm by Ms. Sue

chemistry
@ DrBob222, i tried your way already and it didnt work. 2/102 x100=1.96 can you double check again
Thursday, January 7, 2010 at 9:55pm by eng

Drbob222
Can you please help me with some questions I have on my Chemistry lab?
Saturday, November 27, 2010 at 10:30pm by Mandy

Teacher Aide
DrBob222, could you please help me with a chemistry question I posted?
Saturday, March 9, 2013 at 12:09am by Agnes

DrBob222 please read
Would you recommend me to study for pre-general chemistry first before taking general chemistry? Because I do not remember anything from my chemistry class at all.
Monday, October 11, 2010 at 9:59pm by Advice please

Chemistry HELP
DrBob222- I didn't get any answers from you? I looked but didn't see anything. Can you redo it maybe? Please and Thank You!
Tuesday, October 13, 2009 at 1:10pm by Adam

Chemistry
DrBob222 please help me answer the question that I posted pleaseee, pleaseeee
Tuesday, February 16, 2010 at 10:22pm by Jennifer

Chemistry
Is DrBob222 available tonight? Please let me know, I need some chem help.
Monday, October 11, 2010 at 8:37pm by Karen

Chemistry
@DrBob222 I understood up to the substitution part, can you explain that please?
Saturday, December 15, 2012 at 11:25pm by Anonymous

Chemistry
Just WHO IS DRBOB222? AND WHY ARE YOU SO AMAZING? PLEASE TELL US MORE ABOUT YOURSELF!
Wednesday, July 14, 2010 at 3:08am by Sam

CHEMISTRY
DrBob222 more precisely how to find the limiting reagent on this one, and what to do next please
Friday, February 8, 2013 at 11:08am by Anonymous

To: DrBob222
Can you please check my previous science post. As of right now, you are the only science teacher on this site--which is why I am pleading you to. Thank you very much:-)
Thursday, April 8, 2010 at 10:59pm by Sara

chemistry
DrBob222 do you think you can help me figure these out please. On #4 would I do 12.2g x 35.0g= ??
Wednesday, March 4, 2009 at 11:47pm by Lauren

To DrBob222(Please check Chem)
#4 is the last choice for sure. I googled exothermics and i even found examples. #'s 12 and 14 look wrong to me also but those are the only choices i got.
Thursday, June 21, 2012 at 11:34am by Liz

Chemistry(Please help)
What is the pH of a 5.06E-2 M aqueous solution of sodium acetate? I know that I would set this up the same way I did for the previous question that I posted. I am just confused on how to find the Ka. I know it is kw/kb but for what compound is what I do not know. Chemistry(...
Sunday, April 8, 2012 at 12:10pm by Hannah

To DrBob222(Please check Chem)
#4. I believe dissolv ing ammonium nitrate in H2O is a highly endothermic reaction. Look at the stam answer. #12. I think 10.8 kJ. Check me out on this. #14. I think you made a typo. The correct answer is not listed. I think you intended to write 3.16E-9 and not 3.16E9.
Thursday, June 21, 2012 at 11:34am by DrBob222

DrBob222
I know I posted this but you didn't answer! Please help!!!! Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer ...
Thursday, March 15, 2012 at 12:41am by Kelsey

chemistry
DrBob222 I am 11 years old and in sped I don't understand your answer. Please give a little more detail.
Monday, September 27, 2010 at 5:13pm by Alex

chemIstry
what does air pressute do to the freezing, melting ad boiling point *Note to DrBob222: If you are going to answer this, please , no links
Thursday, September 17, 2009 at 7:47pm by Chad

Chemistry
Dear DrBob222,Mr bob pursley answer is not enough(clear) for me.please explane briefly two Questions
Wednesday, January 11, 2012 at 1:34pm by Chemo

DrBob222
DrBob222 I am kind of stuck with the balancing stuff, and I already had send the post, did you not read it?
Thursday, July 15, 2010 at 10:46pm by Derrick

math 4thgrade thanks DrBob222
Thanks a lot I get it now!!!!!! From Adam To DrBob222
Wednesday, November 15, 2006 at 8:13pm by Adam

To DrBob222
DrBob222 do you know anything about Heredity and Punnet Squares?
Wednesday, June 9, 2010 at 9:52pm by Sara

Chemistry (DrBob222)
Hi Dr. Bob would you please tell me what D rpresents? Thank you! What is the reactant, products, and what compounds is it? Is it H2O, O2, or what? What are the transition molecules? Help please. Do as below to get to the image. I couldn't put the URL in and it isn't my website...
Sunday, June 17, 2012 at 7:50pm by Anonymous

chemistry
DrBob222 i need the solution of this numerical problem step by step please
Sunday, May 5, 2013 at 11:54am by john

Ion charge & formulas of ionic compunds-DrBob222
Thank you very much DrBob222. You've helped me a lot, and I really appreciate that:-)
Tuesday, April 20, 2010 at 10:35pm by Sara

chemistry ** CAN YOU LOOK AT MY ANSWER, PLEASE, DRBOB222? :)
the answer i came up w/ is 1.76g/L. is this correct?
Wednesday, April 11, 2012 at 2:46pm by randi

CHEMISTRY: URGENT DRBob222
can anybody please tell me the source of this question , i mean the board from which the question is taken? thanks
Thursday, March 14, 2013 at 8:45pm by hina

For Bobpursley Chemistry
I already asked Drbob222 for a substance that i cantake to school wich contains an aromatic compund, I'm not suppose to buy because it must be at home. please help me:0
Wednesday, January 31, 2007 at 3:37pm by Iveth

DrBob222
Thank you very much DrBob222, if I ever get stuck again, I'll be sure to ask you, but before that I'll try to figure out the problems myself as a challenge. Thank you
Thursday, July 15, 2010 at 10:46pm by Derrick

Chemistry
DrBob222 can you please explain more specifically.I don't know if iodine or phosporus is the limiting reagent so i can compare it with C2H5I. Can you tell me only the process how to compare the 3 reagents to find the limiting reagent please.
Wednesday, February 6, 2013 at 3:19pm by Anonymous

DrBob222 : Chemistry HElp...Please Check
You don't mean the molar mass is 0.03240, you mean the molarity is 0.03240. I get the same figures you do. So the solution of Na2S2O3 is 0.03240 M. By the way, I think you are limited to just the one zero as I have it written and not 0.032400. Since the 27.15 mL, 25.00 mL ...
Tuesday, October 21, 2008 at 9:48pm by DrBob222

DrBob222
I have dS for system = 216.4 - 5.74 -2(223.0) = ? J/mol = -235.3 J/mol Check that. dS for surroundings = -dH/T = -(-139,000)/298 = 466.4 J/mol dS total (universe) = dS sys + dS surr = -235.3J + 466.4 = ? check that. Check the signs. Check the # s.f.
Thursday, March 15, 2012 at 12:41am by DrBob222

Chemistry(Please help)
Calculate the pH of an aqueous solution of 0.15 M potassium carbonate. I know that pH = -log(H30+) but I am not sure how to start this problem. Chemistry(Please help) - DrBob222, Saturday, April 14, 2012 at 11:09pm Hydrolyze the CO3^2-. CO3^- + HOH ==> HCO3^- + OH^- Do an ...
Tuesday, April 17, 2012 at 2:05pm by Hannah

DrBob222 : Chemistry HElp...Please Check
Sorry its not letting me post the entire thing in the other thread .000146612 mols KIO3 x (3 mols I2/1 mol KIO3) x (2 mols S2O3^-2/1 mol I2) mols = .000887972 mols S203^2- Then M S2O3^-2 = .000887972 mols/0.02715 L.M = 0.032400 Therefore the Molar mass of Na2S2O3 is 0.032400
Tuesday, October 21, 2008 at 9:48pm by Sara

To DrBob222 impersonator
To the DrBob222 impersonator. If you use my name again for one of your unauthorized diatribes, I will (not shall) ban your computer from this board. I can and I will do it.
Wednesday, February 15, 2012 at 11:40pm by DrBob222

DrBob222 PLEASE HELP!
I posted this question already but you never replied back :( Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer...
Saturday, March 17, 2012 at 3:31pm by Leila

Damon and DrBob222
Yes, that's what we were dealing with. Please write up the details and email them to the webmaster. Please also cc your emails to Bob.
Friday, March 23, 2012 at 9:59pm by Writeacher

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

DrBob222
There under help please
Monday, April 5, 2010 at 9:27pm by Help please

DrBob222 : need some clarification
Hi DrBob222, Could you please explain want you typed: *You must have 10 mmoles of that still un-titrated (you had 10 millimoles of the original and that is gone but you still have 10 mmols of the other acid remaining. Are you saying I have 10 mmoles of each acid, if so how did...
Tuesday, September 11, 2012 at 12:55am by ron

chem/some1 check my work plz.
thank you for all your help Drbob222...just whish me luck for tomorrow in my test... :)
Tuesday, November 16, 2010 at 9:13pm by julia

chem/some1 check my work plz.
thank you for all your help Drbob222...just whish me luck for tomorrow in my test... :)
Tuesday, November 16, 2010 at 9:13pm by julia

chemistry - Please help
DrBob222, I understand that oxidation is a loss, but appears as an increase. I still have two questions. 1) Fe goes from +2 to +3, and S goes from -2 to +6. They both appear to be oxidized because they increased. Please explain. 2)I think my problem is that I don't understand ...
Saturday, January 19, 2013 at 11:42am by Sushmitha

DrBob222-Done
a-magnesium and chlorine = MgCl2 b-silver and sulfur = Ag2S c-cobalt(III) and Oxygen = Co2O3 d-Zinc and bromine = ZnBr2 e-calcium and nitrogen = Ca3N2 f-copper(I) and nitrate = Cu3NO Sorry about that. I jumped onto the next question without finishing the previous one. Can you ...
Tuesday, April 20, 2010 at 10:35pm by Sara

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

Chemistry
Thank you, drbob222
Tuesday, January 22, 2008 at 6:12pm by Billy G

chemistry
thank you DrBob222!!!
Thursday, March 5, 2009 at 8:56pm by jimmy

chemistry
thanks for the help DrBob222!
Thursday, October 1, 2009 at 7:21pm by Anonymous

Chemistry
Thank you DrBob222
Thursday, March 4, 2010 at 9:21pm by Ana

Chemistry
Thank you DrBob222!
Sunday, April 25, 2010 at 6:46pm by Timothy Boo

Chemistry-DrBob222
Oh Thanks:-)
Tuesday, October 12, 2010 at 7:20pm by Anonymous

Chemistry
Hi DrBob222, Thanks for your help. :-)
Tuesday, December 14, 2010 at 7:55pm by Korina

Chemistry
Thank you DrBob222.
Saturday, April 23, 2011 at 1:00pm by Jude

Chemistry
thanks DrBob222
Tuesday, October 4, 2011 at 11:12pm by john

chemistry
Thank you DrBob222
Monday, January 30, 2012 at 6:20pm by kalynn

chemistry
thanks DrBob222
Monday, February 13, 2012 at 2:14am by kay

Chemistry
Thank you DrBob222
Monday, April 2, 2012 at 8:26pm by Danielle

Chemistry
Thank you DrBob222 for your help!
Sunday, May 6, 2012 at 9:48pm by Pat

chemistry
thanks DrBob222
Monday, May 14, 2012 at 1:27am by bea

Chemistry
Thank you DrBob222!
Friday, October 12, 2012 at 12:28pm by Cicily

Chemistry
Thank you DrBob222
Wednesday, October 17, 2012 at 1:30pm by Amy

Chemistry
@DrBob222 That's not it.
Saturday, March 2, 2013 at 3:23pm by Enrico

Chemistry
DrBob222, do you know how to do this?
Thursday, March 14, 2013 at 6:48pm by Tim

Chemistry
Thank you DrBob222
Saturday, September 21, 2013 at 9:07pm by Anonymous

Chemistry(DrBob222)
thanks for your help :)
Monday, December 9, 2013 at 7:24pm by K

Chemistry- DrBob222 Urgent Please help
I'm not an organic chemist; therefore, I'm not up to recent IUPAC standards so you should confirm whatever I write about organic. I would name these as follows: 1,4-butadiene 1-pentyne-3-ene 2-bromo-3-chlorohexane
Tuesday, November 26, 2013 at 10:42pm by DrBob222

To DrBob222
Can someone please help me? Like now
Tuesday, September 22, 2009 at 12:34am by Shavaleir

Chemistry
That's what I meant, thank you for you help DrBob222
Sunday, February 28, 2010 at 8:48pm by Ana

General Chemistry
Thank you DrBob222!!!
Sunday, April 11, 2010 at 2:51pm by Alex

chemistry
Thank you anonymous and DrBob222!
Tuesday, April 27, 2010 at 9:58pm by Diana

Chemistry
Thank you so much DrBob222
Wednesday, August 25, 2010 at 6:12pm by Brittney

College Chemistry
Thank you DrBob222
Tuesday, May 3, 2011 at 11:01pm by Jude

Chemistry
Thank you so much DrBob222
Friday, May 6, 2011 at 11:20am by Jude

Chemistry
Thank you so much DrBob222
Friday, May 6, 2011 at 10:43am by Jude

chemistry
can you do it for me if possible drbob222 ?
Thursday, June 30, 2011 at 6:20pm by linda

Analytical Chemistry
Thank you DrBob222
Monday, January 30, 2012 at 6:04pm by kalynn

Chemistry
Thanks DrBob222! You are the best! :]
Saturday, February 18, 2012 at 10:24pm by Kylie

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