Number of results: 188,111
Chemistry(Please Check)
4,5,6 look ok. 1,2,and 3 I can't confirm. Show your work on those. I didn't check 7.
Monday, April 23, 2012 at 11:56am by DrBob222
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
Chemistry(Please check)
yes.
Thursday, September 20, 2012 at 6:28pm by DrBob222
Chemistry(Please check)
yes
Wednesday, September 12, 2012 at 11:52pm by DrBob222
Chemistry(Please check)
yes
Wednesday, September 12, 2012 at 11:39pm by DrBob222
Chemistry(Please check)
yes
Sunday, April 8, 2012 at 3:10pm by DrBob222
Chemistry(Please check)
yes
Sunday, April 1, 2012 at 12:41pm by DrBob222
Chemistry(Please check, thank you)
yes
Thursday, March 29, 2012 at 1:25pm by DrBob222
Chemistry(Please check)
ok
Sunday, February 19, 2012 at 11:21pm by DrBob222
Chemistry(Please check)
yes.
Friday, February 10, 2012 at 11:59pm by DrBob222
Chemistry(Please check)
yes
Friday, February 10, 2012 at 11:32pm by DrBob222
Chemistry(Please check)
Yes
Sunday, October 30, 2011 at 12:37pm by DrBob222
Chemistry- please check my work
We would much prefer you to show your work and let us check your answer. We can help better that way.
Wednesday, February 25, 2009 at 9:54pm by DrBob222
Chemistry(Please check)
yes, that is true.
Sunday, April 22, 2012 at 11:30pm by DrBob222
Chemistry(Please check)
I get 3.69E-9
Tuesday, April 10, 2012 at 10:53am by DrBob222
Chemistry(Please check answers)
yes
Sunday, April 1, 2012 at 3:40pm by DrBob222
Chemistry(Please check)
I agree.
Tuesday, January 10, 2012 at 10:20pm by DrBob222
DrBob222 : Chemistry HElp...Please Check
thank*
Tuesday, October 21, 2008 at 9:48pm by Sara
Chemistry please check
Thanks DrBob222!
Friday, February 15, 2008 at 11:35pm by Mary
Chemistry(Please check answers)
Yes, a is correct.
Monday, April 23, 2012 at 1:29pm by DrBob222
Chemistry(Please check answer)
That last one is ok.
Sunday, April 8, 2012 at 12:11pm by DrBob222
Chemistry(Please check)
I think that's right.
Saturday, March 24, 2012 at 5:48pm by DrBob222
Chemistry(Please check, thank you!)
Answered above.
Sunday, March 4, 2012 at 3:15pm by DrBob222
Chemistry(Please check)
No. C = 0.453/7917.6
Saturday, March 3, 2012 at 7:12pm by DrBob222
Chemistry(Please check)
That's what I would choose.
Friday, February 24, 2012 at 10:27pm by DrBob222
Chemistry(Please check)
That's what I would choose
Friday, February 24, 2012 at 10:21pm by DrBob222
Chemistry(Please check)
Yes, that's what a catalyst does. It does not change k.
Sunday, February 19, 2012 at 6:07pm by DrBob222
chemistry(please check my work)
That looks ok to me.
Saturday, April 3, 2010 at 1:04am by DrBob222
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
chemistry - Can you please check
b is ok except you need to round it.
Wednesday, January 23, 2013 at 7:14pm by DrBob222
chemistry(Please Check)
I can't confirm that. Show your work.
Monday, April 23, 2012 at 2:26pm by DrBob222
Chemistry(Please check)
Very good work.
Sunday, April 1, 2012 at 11:56pm by DrBob222
Chemistry(Please check)
#1 is ok. #2. You don't have carbonate listed.
Saturday, March 24, 2012 at 5:48pm by DrBob222
chemistry/check please
See your post above.
Sunday, February 12, 2012 at 2:27pm by DrBob222
Chemistry(Please check)
Responded to a later post.
Friday, February 10, 2012 at 11:54pm by DrBob222
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
All of these look good to me.
Saturday, February 16, 2008 at 9:58am by DrBob222
Chemistry(Please check)
I agree that C2X3 has the highest solubility.
Sunday, April 8, 2012 at 3:15pm by DrBob222
Chemistry: Check please, these are hw assignments
You need to rethink 1 and 2.
Saturday, April 2, 2011 at 7:39pm by DrBob222
Chemistry: Please check answers
See your other post above.
Thursday, April 11, 2013 at 1:16pm by DrBob222
Chemistry(Please check)
You are right for all three. Good work.
Wednesday, September 12, 2012 at 9:29pm by DrBob222
Chemistry
Please check your posts. This post has been answered below.
Tuesday, February 14, 2012 at 11:33pm by DrBob222
Chemistry(Please check)
2 is ok. 1 is not correct. What is STP? 1 atm 273 K (zero C)
Wednesday, January 11, 2012 at 8:52pm by DrBob222
Chemistry
The percentages don't add to 100%. Please check the post for accuracy.
Wednesday, July 14, 2010 at 10:19pm by DrBob222
Chemistry check Please
If you wished to use the ideal gas law, yes.
Monday, March 9, 2009 at 8:11pm by DrBob222
chemistry(Please Check)
Wouldn't that depend upon how much H2 is in the tank. I have seen this problem several times in the last 2-3 days. This is only a piece of it. Post the entire problem before I can check this part of it.
Monday, April 23, 2012 at 2:19pm by DrBob222
chemistry(please check)
I answered all of this (that I could) at the original post site below.
Monday, April 23, 2012 at 4:28pm by DrBob222
Chemistry(Please check)
Yes; however, I think all three statements are true.
Sunday, April 22, 2012 at 11:46pm by DrBob222
Chemistry(Please check, thanks)
Yes, that's as good any. Generally the more complicated molecule has the higher S.
Sunday, April 22, 2012 at 11:10pm by DrBob222
Chemistry(Please check, thanks)
yes. CCl4(g) is the only gas there; it must have the highest S.
Sunday, April 22, 2012 at 11:10pm by DrBob222
Chemistry(Urgent, please check)
Are you subtracting 1.0-5.7e-5 and getting 0.99. No way.
Sunday, March 4, 2012 at 4:21pm by DrBob222
Chemistry(Please check)
No. Solids aren't included in K. Neither are pure liquids. K = 1/(CO2)
Saturday, March 3, 2012 at 10:04pm by DrBob222
Chemistry(Please check)
5.33E-2 is three s.f. You may have only 2. That is 5.3E-2 or 0.0053
Sunday, February 26, 2012 at 9:32pm by DrBob222
Chemistry(Please check)
No. If the 0.80 is correctly written then you may have only 2 s.f. in the answer.
Sunday, February 26, 2012 at 9:32pm by DrBob222
chemistry(Please check)
I agree with all three answers. Good work.
Friday, January 20, 2012 at 4:19pm by DrBob222
Chemistry(Please check)
1 and 3 are correct. Note that 2I^- --> I2 you are decreasing entropy.
Monday, April 23, 2012 at 11:00am by DrBob222
Chemistry(Please check)
No. Calculate Qsp again. And don't forget to cube IO3^- this time.
Sunday, April 8, 2012 at 4:50pm by DrBob222
Chemistry(Please check)
That's almost ok. You are allowed three s.f. and you wrote only two. 5.72E-5.
Saturday, March 3, 2012 at 7:12pm by DrBob222
Chemistry(Please check answer)
I was able to confirm on the Internet that your rate equation is correct.
Saturday, March 3, 2012 at 7:50pm by DrBob222
Chemistry: please check
No, By definition, oxidation occurs at the anode. Reduction, of course, must then occur at the cathode.
Tuesday, April 9, 2013 at 5:43pm by DrBob222
chemistry(Please Check)
Yes, the - sign tells you it is exothermic. Note that the equation you wrote should be 3NaCl.
Monday, April 23, 2012 at 1:07pm by DrBob222
Chemistry
Would you please check your post. You need to explain what you're doing. Where did the NaCl come from? What did you do with the excess NaOH?
Sunday, October 16, 2011 at 7:07pm by DrBob222
To sam!
Was the five part unknown question for compounds A through E yours? If so, did you get it answered ok? no it was not mine! can you please check my math? can you please check my math?
Monday, December 4, 2006 at 1:26pm by DrBob222
Chemistry(Please check)
:C:::N: CN^- is a B.L base because it can add a proton as H:C:::N: and it has those lone pairs so it can donate electrons, too.
Saturday, March 24, 2012 at 5:48pm by DrBob222
chemistry
Would you like to check your post please? You can't dilute CuCl2 solution and expect KNO3 at the end.
Sunday, November 6, 2011 at 1:39am by DrBob222
Chemistry - Please Check!
Hannah, that's my error. Zn is the limiting reagent, not S and the correct grams ZnS formed is 9.24.
Wednesday, March 14, 2012 at 11:31pm by DrBob222
chemistry
Do you wish to just check your answers or do you not understand something about the problem? Please don't answer in caps; it makes it difficult to read.
Thursday, February 9, 2012 at 12:02pm by DrBob222
chemistry(please check formula)
what units for sph what units watr.
Sunday, April 4, 2010 at 8:09pm by DrBob222
chemistry
Please check your post. There is something wrong. First the wording is not clear; however,even if it were, there is no way to get Na2CO3 out of Na2SO4.xH2O
Saturday, January 28, 2012 at 7:15am by DrBob222
Chemistry(Please check)
No. NaCl is neutral, KCN is basic, LiF is basic, RbClO is acidic.
Sunday, April 1, 2012 at 12:41pm by DrBob222
ChEMISTRY (Help please)
What are the units for density? While you're at it check that problem again. I can't believe the density is that high in g/mL.
Tuesday, April 13, 2010 at 8:02pm by DrBob222
Chemistry(Please check)
That's right. 2 and 3 are not right.
Sunday, February 19, 2012 at 6:07pm by DrBob222
chemistry: please check answers.
I think 17 is ethanedioc acid; you may have just made a typo in your post I am unsure about #18 and 19.
Tuesday, April 30, 2013 at 10:30am by DrBob222
Chemistry
As written, the coefficients are as follows: 1, 12, 1, 1, 10, 6 I haven't check it. You check it.
Thursday, January 24, 2008 at 1:31pm by DrBob222
Chemistry. Please Check!
Why don't you simply balance them and then you'll know. The first one is 2HNO3 + Ca(OH)2 -->Ca(NO3)2 + 2H2O
Saturday, March 24, 2012 at 6:47pm by DrBob222
Chemistry - Please Check!
I don't see any calculations with the S8. I think S8 is the limiting reagent. If that is true 9.24 g ZnS can't be right.
Wednesday, March 14, 2012 at 11:31pm by DrBob222
Chemistry(Please check)
You need to substitute into the Keq expression (called the reaction quotient when you put the INITIAL values in) and compare that with Kc. I don't think D is correct.
Saturday, March 3, 2012 at 9:52pm by DrBob222
chemistry
Answered below. Check on your first post before posting again. Also, please don't use all CAPS. It makes the question difficult to read.
Thursday, February 24, 2011 at 11:08pm by DrBob222
Chemistry
check my thinking. Check my work.
Monday, February 4, 2008 at 7:07pm by DrBob222
Chemistry(Please check answer)
No you didn't. Try rate = k[NO2]^2{O2]^1 and if that doesn't work try omitting the ^1 but NOT the ^2 I think you just omitted the caret.
Saturday, March 3, 2012 at 7:50pm 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
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
Chemistry please check
Ok except for #1. U is a radioactive element, naturally. There is a series for U-238, another series for U-235, and a third for Th-232. All end in Pb.
Friday, February 15, 2008 at 11:35pm by DrBob222
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
Chemistry(Please just check, thank you)
I think 2 is ok. For #1, I agree this is an approximate number. Frankly, I don't know what an approximate pH is. It probably means ignoring k2 for H2SO4; if so then the 2.5 is fine.
Saturday, March 24, 2012 at 1:50pm by DrBob222
chemistry - Can you please check
I believe I read your answer as 12 and not as 55. Your answer for a is 54.45664 and I don't see anything wrong with that except you have carried it out to more places than you are allowed. You can have 3 significant figures; I would round that to 54.5 grams. I will check ...
Wednesday, January 23, 2013 at 7:14pm by DrBob222
Chemistry- please check my work
That's why we like to see your work. Seeing your work made me put those remarks in about the solids.
Wednesday, February 25, 2009 at 9:54pm by DrBob222
Chemistry help please
I thought there were 31 gallons in a barrel. But look at this. 12L c (1.05 qt/1L) x (1 gal/4 qts) x (2 barrels/73 gal) = ?? Check my work.
Tuesday, September 23, 2008 at 4:27pm by DrBob222
Chemistry(Please check answer)
Ag2CO3 is the most soluble; Aag3PO4 is the least. You must go through the Ksp and calculate the solubility of each. You can NOT look at the Ksp values and tell from that.
Saturday, April 7, 2012 at 11:28pm by DrBob222
Chemistry (check formula please)
Danielle--Bob Pursley just pointed out to me that you had kJ in your first post and 669 kJ is a perfectly good answer.
Monday, April 5, 2010 at 11:32am by DrBob222
chemistry(please check formula)
so it would be q= (.449)(1.00)(1490)-correct? u have j/g*k for sph fe but u used 1.00 kg for mass units dont match.
Sunday, April 4, 2010 at 8:09pm by DrBob222
Chemistry
Please see the correction I made below to the 6.02 kJ/mol for heat vaporization for water. It's under the screen name of Rachelle. Sorry about the error. Check me out on all of this.
Friday, November 28, 2008 at 10:41pm by DrBob222
Chemistry(Please check)
No, London forces are the weakest. Weaker than hydrogen bonds and weaker than dipole-dipole.
Saturday, January 28, 2012 at 11:41pm by DrBob222
Chemistry(Please check)
1. 21.3 = mass x sp.h. x delta T sp.h. = 21.3/(5.50*30) is not 7.75. 2. I agree with d.
Friday, January 20, 2012 at 9:55pm by DrBob222
language art CHECK
Will somebody please check this for me and see if i used the words correctly please? Having spent many years as political opponents, the two senators have developed a(n)MUTUAL respect for each other. Please check if it is correct. thank you
Tuesday, January 17, 2012 at 8:51pm by saranghae12
Chemistry please check
Mike--If you have a question, go to the top of the page and click on Post a New Question. Then type in your question and submit it. Someone will review it for you.
Friday, February 15, 2008 at 11:35pm 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
Chemistry(Please check)
Here are the three ionizations for H3PO4. If you write these you will know the answer. H3PO4 + H2O ==> H3O^+ + H2PO4^- Now you write 2 and 3.
Sunday, April 1, 2012 at 9:52pm by DrBob222
chemistry(Please Check)
You dissolve 6.55 g of potassium nitrate in enough water to make a 250. mL solution. What is the molarity of this solution ?Answer: 0.0262 Please Check my answer
Monday, April 23, 2012 at 2:26pm by Wurola
Chemistry
I thought I did this for you last night. Do you just want to check your answer? Post the answer or your work; I'll be happy to check it for you.
Friday, February 17, 2012 at 12:20pm by DrBob222
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