April 19, 2014


Number of results: 93,501

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

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

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

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- 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

COuld u please answer this Ineed the formula for bis(bipyridyl)cadmium(II) chloride
Wednesday, March 7, 2012 at 2:27pm by HELP PLEASE

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

Please predict what will happen. Im not very good in chem. Iron metal and pb(NO3) Lead metal and Mg(9NO3)2 Copper metal and AL(NO3)3 Lead metal and AgNO3
Thursday, April 18, 2013 at 8:44pm by jim

What is another name for cardamist? Please write the formula and a link to its structure. See
Sunday, September 4, 2005 at 5:04pm by Nisar

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 -repost for bobpursley
i don't know how to solve this. looked through all my notes but i'm not sure what kind of formula i am to use or if i even need one! please help me to understand the theory behind this: "calculate the work need to make room for the products in the combustion of S8(s) to SO2(g...
Sunday, April 17, 2011 at 8:53pm by please, help me

Please help!
Thank you for using the Jiskha Homework Help Forum. but instead of just labeling this HELP, please label it math, chem, or whatever the subject matter is. Most of us are looking for certain areas to read.
Saturday, September 29, 2007 at 12:37am by SraJMcGin

Dr BOB, Can you show me how to do the balanced equation please I am shocking at them Thanks AndyWhats the simple way to explain balancing equations so i get it please....because i am horrible at them... Thanks andy
Wednesday, May 12, 2010 at 9:22pm by Andy

Chem Please Help
Saturday, November 24, 2007 at 5:21pm by Sami

CHEM please HELP
Friday, February 13, 2009 at 8:14pm by jerry

Chem Help please!!!!!
thank you
Wednesday, December 19, 2012 at 6:31pm by Taylor

chem please help !!!!
Thursday, October 13, 2011 at 9:29pm by Anonymous

Chem Please Help
Tuesday, April 1, 2014 at 12:43am by Anonymous

Please Help
Sunday, April 6, 2014 at 10:38am by Charlie

Chem Check Please!!!
Using standard thermodynamic data from Appendix L of your text, calculate the equilibrium constant at 298 K for the following chemical reaction: CO(g) + H2O(l) CO2(g) + H2(g). Show work please! Thank you!!!
Sunday, March 16, 2014 at 11:20pm by Layla

thank you
Wednesday, March 12, 2008 at 9:48pm by K

Can you repost #1 please. Thanks.
Monday, August 10, 2009 at 8:08pm by Chem

Chemistry Help Please!!
Thank you! :D
Monday, March 5, 2012 at 8:04pm by Chem Student

Chem- Please check :)
I don't get it :S
Wednesday, April 18, 2012 at 10:21pm by Anonymous

please do not spam!
Tuesday, November 13, 2012 at 6:21pm by Samantha

how do u convert for y?
Tuesday, April 23, 2013 at 11:23pm by scilover

**Chem | PLEASE HELP!!!!!!!!
Thanks a million!!!!
Friday, July 26, 2013 at 10:54pm by LILYYYYY

Please help Chem
Thanks so much!
Thursday, September 19, 2013 at 8:50pm by anony5

The experiment is about titration of vinegar with NaOH. Before I start titration, I need to calculate how much of vinegar I will want to be using. I think I might use 50ml of distilled water to mix vinegar and I am gonna drop 3drops of phenolphthalein as indicator. Please help...
Sunday, October 10, 2010 at 1:54am by Kim

i don't get this at all can you please show me how to do this problem: a sample of oxygen occupies 10.0 L under a pressure of 105 kPa. at what pressure will it occupy 13.4 L if the temperature does not change. please help me set it up
Thursday, May 14, 2009 at 6:33pm by melissa

answer for the first was "3"
Sunday, February 24, 2008 at 8:11pm by K

Can you please post this answer again?
Tuesday, November 11, 2008 at 6:43pm by hi PLEASE!!!
can you explain that better? i'm confused.
Monday, March 9, 2009 at 3:19pm by -

why is the answer 9 can you please explain
Thursday, April 9, 2009 at 8:42pm by Sandra

College Chem
Please do tell...
Wednesday, March 17, 2010 at 5:30pm by London

please answer this>??
Tuesday, January 25, 2011 at 2:20pm by maretcheal

Can u do the steps please with the numbers
Saturday, April 18, 2009 at 6:19pm by Pookali

Chem please help
Doesn't the name tell you?
Thursday, February 23, 2012 at 9:54pm by DrBob222

formula for bipyridyl
Wednesday, March 7, 2012 at 2:27pm by HELP PLEASE

Chem Help PLEASE!
nvm got it.
Wednesday, March 14, 2012 at 8:57pm by Taylor

please post the formula!
Saturday, December 15, 2012 at 10:01am by anonymous

chem please help!
I answered this for you earlier.
Tuesday, January 8, 2013 at 8:39pm by DrBob222

intro chem HELp please
Friday, November 5, 2010 at 12:29am by Tiffany

Chem Check Please!!!
This looks ok to me.
Thursday, March 20, 2014 at 7:56pm by DrBob222

A secondary alcohol results from the attachment of a hydroxy group to which carbon atom? C | <---GIVEN STRUCTURE C1-C2-C3-C4 A) C1 B) C2 C)C3 D)C4 Answer is C! I have to explain why, but the teacher never taught us anything about organic chem. So please explain!
Friday, April 5, 2013 at 2:52pm by Anonymous

hi dan can you help me please on the science tab and it has my name on it hannah please thank you very much and have a very wonderful day
Tuesday, March 12, 2013 at 5:45pm by hannah

can someone help me work it out please?
Monday, October 15, 2007 at 5:49pm by Mike

chem help please
answered your first post.
Thursday, December 6, 2007 at 7:53pm by DrBob222

help on chem
Please. Look at your previous post.
Wednesday, October 8, 2008 at 4:43pm by bobpursley

chem please
the answer is 67 buddy
Sunday, February 1, 2009 at 10:29pm by hahaha

college chem
how did u get that can you please explain the steps
Tuesday, March 23, 2010 at 11:54pm by josh

chem can u check answer please
thanks so much
Sunday, May 23, 2010 at 10:42pm by andy

CHEM. help please
Good job
Tuesday, November 2, 2010 at 5:58pm by Professor Moore

i want u to help by explaining what they mean in each question please :)
Friday, September 2, 2011 at 1:53pm by larsa

Help. Please. This is due in a few minutes.
Wednesday, February 1, 2012 at 9:13pm by HEATHER

Chem(Check Please)
I responded above.
Thursday, June 21, 2012 at 1:32am by DrBob222

chem Help please!
Oh no problem :) and thank you so much for answering!
Saturday, October 20, 2012 at 3:28pm by Kjd

Ptotal = pN2 + pO2
Thursday, July 18, 2013 at 1:01am by DrBob222

please ..chem
photons? light? no way
Monday, February 24, 2014 at 8:56pm by Damon

for 2Al2O3----> 4Al(s) + 3O2 the question is what is the heat change for the formation of 1 mol of aluminum oxide from its elements? Al2O3:-1676.0 O2:0.0 Can someone please explain how to complete this problem step by step please??
Tuesday, January 22, 2013 at 6:08pm by sara

chem help
im doing a graph for chem lab with excel. my classmate created a graph with these coordinates: X: 3.50 X10^-3 3.14X10^-3 3.28X10^-3 Y: -11.7 -8.96 -9.75 They got R2=0.998 but i got y = -3074.9x R = 0.6291 why is it wrong. im desperate please help! screen shot of my graph: ...
Saturday, October 23, 2010 at 11:05pm by ben

Are: Ba(NO3)2, Ti)2, MgI2, and Ca(CH3COO)2 soluble or insoluble in H2O @ 25degrees C? Here is a site that lists the solubility rules. You should know this table; eventually you will want to know it so well that it is memorized. If you still have questions after viewing this ...
Friday, October 20, 2006 at 1:41pm by K

Dr Bob please answer below
Monday, January 5, 2009 at 7:43pm by lyne

chem please
Do you have a chart or graph to follow?
Sunday, February 1, 2009 at 10:29pm by DrBob222

Do you expect acetaminophen to be soluble in water? why or why not? please help... thanks
Tuesday, February 3, 2009 at 11:50pm by Nina

Do you expect acetaminophen to be soluble in 1.0 M NaOH? why or why not? please help... thanks
Tuesday, February 3, 2009 at 11:52pm by Nina

Can someone please answer this
Tuesday, April 3, 2007 at 10:07pm by Dazed and confused

Please retype your question so it makes sense.
Tuesday, March 9, 2010 at 8:24pm by DrBob222

how many atoms of C are in 2 moles of sucrose C12H22O11? please help
Wednesday, March 17, 2010 at 12:28pm by suzie

chem--need help, please!!!
thank you very much, DrBob222!
Wednesday, October 20, 2010 at 12:33pm by Andy

Organic Chem I Lab URGENT
PLEASE assist
Tuesday, November 30, 2010 at 4:06pm by Meredith

chem -repost for bobpursley
oh i didn't know that before, thank you very much! :)
Sunday, April 17, 2011 at 8:53pm by please, help me

A/P Chem
I dont want the answer just the formula please
Sunday, July 24, 2011 at 8:17pm by Autum

Please! What is the answer? Enlighten me!
Monday, September 26, 2011 at 11:53pm by Anonymous

Chem- Please check :)
oh okay. make sense :) thank you so much!
Wednesday, April 18, 2012 at 10:21pm by Anonymous

Thanks DrBob222!! the help is much appreciated!
Thursday, December 13, 2012 at 5:23pm by MSJO

Chem Help please!!!!!
See your other post above.
Wednesday, December 19, 2012 at 6:31pm by DrBob222

in chem
can u please tell me the number of molar mass i was using...
Monday, December 24, 2012 at 4:38pm by Help

AP Chem please help!
See other post
Tuesday, January 29, 2013 at 7:58pm by Devron

Chem for final, please help!
How many moles of H+(aq) ions are present in 1.25 L of 0.75M Nitric Acid? A. 0.60 mol B. 0.75 mol C. 0.94 mol D. 1.7 mol E. 1.9 mol Please show me how to work this!
Tuesday, December 7, 2010 at 1:27pm by lavonne

chem can u check answer please
the solubility of silver sulfate in water is 0.223%(w/v) at 35 degrees celsius.calculate the solubility product of this salt at this temp. I got 1.46 X 10^-6 M is this right please thanks Andy
Sunday, May 23, 2010 at 10:33pm by Andy

Ionic bonds and covalent bonds, which one is the stronger. My present teacher said that covalent bond is the strongest one. I learned ionic interaction is the strongest and many chem. books say so. Now i am confused. Is my present teacher right. Please explain this for me, and...
Tuesday, October 5, 2010 at 9:35pm by bun

how do i calculate a concentration ratio of oxidised to reduced cytochrome c Fe2+ to Fe3+ given at 25 C and pH7 E(mV) as 100 and absorbance at 550nm as 1.5 E is relative to standard hydrogen electrode i dont know how im supposed to calculate it from this data please help!!!
Thursday, February 18, 2010 at 9:47am by lu

chem please help
how do i calculate a concentration ratio of oxidised to reduced cytochrome c Fe2+ to Fe3+ given at 25 C and pH7 E(mV) as 100 and absorbance at 550nm as 1.5 E is relative to standard hydrogen electrode i dont know how im supposed to calculate it from this data please help!
Thursday, February 18, 2010 at 4:09pm by lu

Please check DrBob's answer below.
Tuesday, November 27, 2007 at 6:02pm by Ms. Sue

not ethelyne glycol?
Saturday, May 24, 2008 at 4:50pm by Sarah H

Can you please explain yourself Dr Bob 222.
Tuesday, August 23, 2011 at 8:30am by sam

Chem Please HELP!!!!!!!!!!!!!!!
You must type the choices. You can not copy and paste.
Wednesday, September 30, 2009 at 10:39pm by DrBob222

college chem
PLEASE..Determine [OH-]of a solution that is 0.270 M in HCO3-...thanks
Friday, April 9, 2010 at 1:33pm by susy

Your question, as posted, makes no sense. Please clarify.
Thursday, November 25, 2010 at 8:29pm by DrBob222

c) Ca (s) reacts and produces Co2(g) Can you explain to me why it's b please?
Wednesday, December 15, 2010 at 5:12pm by Liz

chem- repost
thank you for responding, where did you get "4 x 22.4dm^3/1000dm^3" from though?
Sunday, April 17, 2011 at 7:20pm by please, help me

there are no instructions... i dont see it
Sunday, August 19, 2012 at 3:14pm by Hannah

Chem Lab
I need help with these problems as soon as posible Please
Monday, October 8, 2012 at 10:37pm by Aliya

Chem Lab
I need help with these problems as soon as posible Please
Monday, October 8, 2012 at 10:37pm by Aliya

Urgent need help on chem please someone
I answered this one for you.
Thursday, January 31, 2013 at 9:32pm by Devron

Please help Chem
You should have obtained BaCl2.2H2O
Thursday, September 19, 2013 at 8:50pm by DrBob222

Will Someone please respond! Chem
Will you please help me with this also? How much heat do you need to raise the temperature of 150 g of ice from 30oC to 15oC? 4.61 kJ <--This is my answer.Is itright? 4.68 kJ 5.49 kJ 9.40 kJ
Friday, June 22, 2012 at 11:34am by anonymous

I need to calcuted the molarity from this 12.5 g of ethylene glycol antifreeze dissolved in o.100kg of water. Density of solution is 1.0 g/mL I know molarity if mole of solute / L of solution. I am confused on how to find the L of solution. Do I add 12.5 and .100g to get the ...
Friday, February 15, 2013 at 4:12pm by Please please helppppp!!!!!

The 4.9 will limit all to two sig digits.
Thursday, September 13, 2007 at 8:44pm by bobpursley

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