April 16, 2014

Search: chemistry (DrBob222)

Number of results: 111,084

No one person "invented" chemistry. Chemistry is an evolving science. Chemistry is conceptual.
Sunday, December 6, 2009 at 10:53am by DrBob222

See comments by Bob Pursley and DrBob222 above.
Wednesday, October 6, 2010 at 7:14pm by DrBob222

yes, <7, and for all the reasons you gave.
Tuesday, October 12, 2010 at 7:24pm by DrBob222

Logan is right. It's a strong acid.
Tuesday, October 12, 2010 at 7:16pm by DrBob222

To prevent hydrolysis of the ester.
Thursday, March 14, 2013 at 8:45pm by DrBob222

Chemistry -- DrBob222
Yes, your answer is correct. The 50 C is the 323 K.
Friday, May 24, 2013 at 12:30pm by DrBob222

Chemistry- DrBob222
All of your work looks good to me.
Tuesday, October 22, 2013 at 6:50pm by DrBob222

College Chemistry (DrBob222)
See your post below.
Tuesday, March 25, 2014 at 4:52pm by DrBob222

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

Is this class beginning chemistry? I did not think freshman chemistry would be discussing hydrogen/metal over potential.
Thursday, November 8, 2012 at 10:23pm by DrBob222

chemistry (DrBob222)
See your other post.
Monday, November 21, 2011 at 1:31pm by DrBob222

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 will do it.
Wednesday, February 15, 2012 at 11:40pm by DrBob222

Above posted by DrBob222.
Monday, January 7, 2008 at 8:34pm by DrBob222

The above posted by DrBob222.
Friday, February 15, 2008 at 9:54am by DrBob222

You're right again.
Tuesday, October 12, 2010 at 7:14pm by DrBob222

I don't know enough about what you did to answer; however, my first educated guesses are (1) the procedure is no more precise than that or (2) you're still learning the procedure.
Monday, December 9, 2013 at 7:24pm by DrBob222

There is a lot of chemistry in meteorology but that's only part of the story. There are many other aspects of meteorology than chemistry.
Thursday, March 12, 2009 at 4:18pm by DrBob222

Chemistry - DrBob222
Ba(OH)2 + Na2SO4 ==> BaSO4(white ppt.) + Na2SO4
Sunday, November 11, 2007 at 8:34pm by DrBob222

No. I can guarantee you that Bob P and DrBob222 are NOT the same person. In fact, he and I live about 400 miles from each other. I just picked up your confusion over the nitrate ion because he wasn't on-line at the moment.
Sunday, October 24, 2010 at 5:24pm by DrBob222

Chemistry (DrBob222)
D represents the time it takes for the reactants to obtain enough energy to reach the peak of the activation energy needed to form the intermediate complex of B.
Sunday, June 17, 2012 at 7:50pm by DrBob222

It may be but I picked these values out of a freshman college chemistry text.
Sunday, April 6, 2008 at 6:15pm by DrBob222

I make an ICE chart for almost every chemistry problem.
Saturday, March 17, 2012 at 7:30pm by DrBob222

I've done the chemistry for you. In detail. If you will show your work I'll try to find the error.
Tuesday, February 5, 2013 at 9:07pm by DrBob222

See the post above labeled Chemistry and its by Becky.
Friday, November 9, 2007 at 11:26am by DrBob222

AP Chemistry
And thank you. But I'm SUPPOSED to know chemistry; therefore, I don't get extra points for that.
Sunday, April 3, 2011 at 2:28pm by DrBob222

chemistry ----------- chemistry
Changes in electrons are chemical; otherwise physical
Monday, October 1, 2012 at 2:08am by DrBob222

chemistry ........................chemistry
They look ok to me. Sr is red and Li is crimson.
Monday, October 15, 2012 at 12:30am by DrBob222

Chemistry: Organic Chemistry
This forum doesn't support drawing mechanisms.
Tuesday, November 5, 2013 at 2:58pm by DrBob222

chemistry A level
Ph. D. in chemistry from Missouri University (a long time ago).
Friday, December 5, 2008 at 4:56pm by DrBob222

chemistry .....chemistry
Barium, lithium, boron, etc to give color to the fireworks display.
Thursday, October 11, 2012 at 11:52pm by DrBob222

I answered this for you last night. In addition, if you performed the experiment you should know what color it was.
Friday, October 12, 2012 at 12:38am by DrBob222

In inorganic chemistry, compounds with OH generally are bases (NaOH, KOH, Al(OH)3, etc). In organic chemistry, an OH attached to a C is an alcohol. -COOH is an acid. C-O-C is an ether. RCOOH = acids ROR ethers RCOOR = esters RNH2 amines RCONH2 amides.
Sunday, June 7, 2009 at 6:21pm by DrBob222

That has been answered below. Find it under chemistry or repost if you have no luck.
Monday, March 9, 2009 at 7:37pm by DrBob222

These are ordinary compounds available in most labs. Why not try it and see what happens? That's chemistry.
Sunday, June 21, 2009 at 7:24am by DrBob222

AP Chemistry
Have you tried looking in solubility tables? For example, The Handbook of Chemistry?
Wednesday, November 11, 2009 at 9:51pm by DrBob222

This is an experience in knowing chemistry. Try NH3 for CuSO4, dil HCl for Pb(NO(3)2,
Sunday, July 3, 2011 at 1:33pm by DrBob222

Answered above. See Chemistry by Sarah.
Sunday, January 10, 2010 at 4:46pm by DrBob222

Last Chemistry Question!
Not an M.D. Ph. D. in chemistry. Retired teacher.
Sunday, February 19, 2012 at 11:21pm by DrBob222

ICE tables are the baling wire of chemistry.
Sunday, February 10, 2013 at 4:43pm by DrBob222

That's what we need in chemistry. More moral solutions.
Monday, March 4, 2013 at 4:57pm by DrBob222

chemistry ............chemistry
Ba for green, Sr for red, Li for crimson, K for violet, Na for yellow.
Monday, October 15, 2012 at 2:04am by DrBob222

Chemistry (DrBob222)
dG = -RT*lnK or dG = dH - T*dS As T increases dG becomes more negative.
Wednesday, December 4, 2013 at 9:37pm by DrBob222

I think this is more a math than a chemistry question but the answer to two significant figures is 12 cm^2.
Thursday, August 29, 2013 at 1:14pm by DrBob222

9th grade chemistry
organic chemistry
Wednesday, January 7, 2009 at 9:19pm by DrBob222

Chemistry - DrBob222
what is the name of ag2s in chemistry
Sunday, November 11, 2007 at 8:34pm by weslay

Your question makes no sense to me. This is chemistry?
Wednesday, May 25, 2011 at 7:20pm by DrBob222

chemistry -------------chemistry
That sounds pretty good to me.
Thursday, October 11, 2012 at 12:55am by DrBob222

I suppose chemistry but you probably already know that?
Sunday, February 3, 2013 at 6:16pm by DrBob222

Qualitative chemistry tells you WHAT is in the sample. Quantitative chemistry tells you HOW MUCH is there. Most people, I think, use a qualitative measurement to mean that it is approximate.
Thursday, September 10, 2009 at 4:55pm by DrBob222

Does the free radical have a charge? What is hoco. If you intend to study chemistry you need to learn where the caps button is.
Monday, December 5, 2011 at 8:14pm by DrBob222

To Anonymous---chemistry
C'mon. Find the caps key. CO, Co, co have three separate meanings. Don't make chemistry harder than it is.
Tuesday, April 9, 2013 at 9:06pm by DrBob222

No. Organic chemistry is over run with resonance structures. Most polyatomic ions in inorganic chemistry as well as many compounds have resonance structures.
Sunday, November 11, 2007 at 1:19pm by DrBob222

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

In my ignorance about organic chemistry, I was under the impression that e was trans and z was cis. (z for zusammen and e for entgegen, z same side and e for opposite).
Thursday, July 29, 2010 at 2:25pm by DrBob222

Chemistry - DrBob222
Yes, AgCl is the way to go. See my other comments. This procedure will help you determine some of the ions but it will not allow you to determine some of them.
Sunday, November 11, 2007 at 8:34pm by DrBob222

Hundreds of sites are available but it depends upon what in chemistry you need help with. The easiest thing to do is to go to Google and type in the subject (not chemistry but the area of chemistry). For example, Le Chatelier's principle if you need help with that or gas laws ...
Saturday, October 26, 2013 at 10:42pm by DrBob222

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

This is really a broad question. There must be 100 or more reasons why ether is used in organic chemistry; one reason is as a solvent.
Tuesday, July 30, 2013 at 11:11pm by DrBob222

Chemistry-Repost for DrBob222
You can use the mg directly in the ratge equation. And I made a typo. That first line should have read, "Is that C60O3
Friday, March 21, 2014 at 2:06pm by DrBob222

Thank you DrBob222! I got it now!
Thursday, September 27, 2007 at 9:36am by chemistry

I'm better at chemistry than arithmetic.
Friday, July 31, 2009 at 10:14pm by DrBob222

You are SO SO right. Isn't chemistry interesting?
Sunday, March 7, 2010 at 5:58pm by DrBob222

chemistry .............chemistry
What's in the solution? How are you heating it?
Friday, October 12, 2012 at 12:52am by DrBob222

Instead of making this a question on a year of chemistry, tell us what you don't understand about this. It's just too long to type a bunch of stuff you already know.
Wednesday, February 29, 2012 at 10:56pm by DrBob222

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

Thanks for helping me DrBob222.I am studying IB program and I have many questions and problems I do not understand about chemistry.I will post them later.I hope you can follow and help me.I am so grateful.Thank you so much ^_^
Monday, February 18, 2013 at 10:43pm by Anonymous

Thanks for helping me DrBob222.I am studying IB program and I have many questions and problems I do not understand about chemistry.I will post them later.I hope you can follow and help me.I am so grateful.Thank you so much ^_^
Monday, February 18, 2013 at 10:43pm by chirikamo

CH3COOH + HOCH2CH3 =>CH3COOC2H5 + H2O 3a. mol CH3COOH = M x L = about 0.80. b. initial = 0.500-0.08 ending = 0.420 c. 1.00-0.08 = 0.92 d. Substitute and calculate Kc.
Thursday, March 14, 2013 at 5:54pm by DrBob222

Sorry I didn't post my name. My computer shut down, one reason I'm a little late in answering this, and it took a little time to get things back on track. When I first sign on, I get a name of anonymous unless I type in drbob222.
Tuesday, February 5, 2008 at 11:23pm by drbob222

Chemistry (A level)
Aaaaah, thank you DrBob222! A lot clearer than my chemistry teacher explained it! Shall work my way through it and see what I can make of it. Cheers for such a fast response :)
Saturday, December 6, 2008 at 9:49am by Benjy

Don't get too lazy in chemistry that you can't punch the caps key. Co, CO, and co are three distinct things. 2NaOH + H2SO4 ==> Na2SO4 + 2H2O You didn't provide enough information to answer the question.
Tuesday, October 16, 2012 at 2:52pm by DrBob222

Are you looking for someone to derive this number? Look in your texts. Most chemistry and physics texts have it.
Wednesday, March 25, 2009 at 5:40am by DrBob222

Pretty sketchy information. More information might help. What is this in connection with. What kind of subject within chemistry.
Wednesday, January 26, 2011 at 5:53pm by DrBob222

Are the ingredients supposed to be edible? What other guidelines do you have? How long have you had this project? Is it for a chemistry course or not?
Thursday, March 22, 2012 at 6:18pm by DrBob222

Physical Chemistry
Really this is analytical chemistry. It will take twice as much to reach the second as it did to reach the first.
Monday, February 10, 2014 at 4:07am by DrBob222

Atomicity is a new term on me. I googled it an found that it is a synonym in chemistry for valence but I don't get the connection. Can you define atomicity as you are using it?
Wednesday, December 24, 2008 at 1:20pm by DrBob222

Four years of college, six more in graduate school, and 60 years experience will get it. And there is a lot of chemistry I don't know.
Saturday, April 24, 2010 at 4:56pm by DrBob222

Paul--I worked this problem further up the board for Adam. Go to 1:53 PM and post by Adam (chemistry) to find it.
Sunday, April 25, 2010 at 1:10am by DrBob222

Chemistry Titration Lab
Perhaps you are Redfire. I've not seen another chemistry question from grade 11. Give us the info and we can help but we need the info. We aren't clairvoyant.
Thursday, December 18, 2008 at 4:10pm by DrBob222

I honestly don't know how to answer this question. Le Chatelier's Principle applies to acid/base chemistry, of course, but no differently than to any other reaction of any other kind.
Tuesday, November 30, 2010 at 3:49pm by DrBob222

Chemistry(Please respond, thank you!)
I thought one of the first constants one learned in chemistry from the PV = nRT equation was R. R = 0.08206 L*atm/mol*K.
Thursday, March 15, 2012 at 1:02pm by DrBob222

Two or three points here. 1. You can't get lazy in chemistry and not use the caps key. Those symbols don't mean anything to me. 2. -2984, -285.9, -1279 what units. 3. Calculate enthalpy change for what?
Wednesday, July 4, 2012 at 7:25am by DrBob222

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

There are many salts in chemistry. I assume you mean table salt. That is NaCl. How accurate should the number be? It is about 58.5. It is 58.4425 to four significant figures.
Monday, December 10, 2007 at 4:32pm by DrBob222

Chemistry university level
See my response to the same question posted just a few above this one entitled Chemistry and by no name but --. Posted at 7:20 pm.
Tuesday, January 27, 2009 at 7:11pm by DrBob222

Not much chemistry in this. If you have a calculator, use it. If you don't, go to and type in 2420*24 = and press enter. Google does math calculations.
Friday, January 8, 2010 at 10:53am by DrBob222

You need to rewrite the post so it makes sense. m means molality; M means molarity. HCl is hydrochloric acid. I have no idea what stalk is, at least concerning chemistry.
Wednesday, February 6, 2013 at 7:43am by DrBob222

It means that the electrolyte dissociates into its separate ions and the chemistry of the solution is the chemistry of the ions. For example, NaCl, when placed in water, dissociates into Na^+ and Cl^-. There is no NaCl anymore.
Tuesday, January 13, 2009 at 6:40pm by DrBob222

I made a typo in my response (transposed the numbers). The concn we calculated is 0.298 or so and to two s.f. that rounds to 0.30 (not 0.03 as I posted in my second post). I think 0.30 will get it for you. I would appreciate a new post to DrBob222 since this one is getting ...
Friday, March 2, 2012 at 8:13pm by DrBob222

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

Monday, June 30, 2008 at 7:35pm by DrBob222

Monday, October 22, 2007 at 9:51pm by DrBob222

Monday, October 22, 2007 at 9:47pm by DrBob222

Tuesday, October 23, 2007 at 12:12am by DrBob222

Tuesday, October 23, 2007 at 12:23am by DrBob222

Tuesday, November 6, 2007 at 9:03pm by DrBob222

Sunday, November 18, 2007 at 10:19pm by DrBob222

Tuesday, November 20, 2007 at 10:20pm by DrBob222

Thursday, December 6, 2007 at 1:01am by DrBob222

Sunday, December 16, 2007 at 7:18pm by DrBob222

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