Number of results: 159,518
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
To all chemistry students
Please understand that one of our chemistry tutors is on vacation this week. Please be patient.
Thursday, March 24, 2011 at 1:28pm by Writeacher
organic chemistry
Which has a higher Rf value Ibuprofen or mefenamic acid? please please please.i need your answers.
Saturday, December 27, 2008 at 11:08am by lou
Chemistry 130
Can someone please help me with this question? Could freezing point depression be used for substances that are not soluble in water? Please help me....can you explain why? Is there anywhere I can find this information because my chemistry book doesn't have any info. about ...
Wednesday, October 7, 2009 at 12:07pm by Jessie
chemistry project please help really need it
help me out in choosing a topic for my project it should be anyhow related to chemistry help me please
Thursday, May 23, 2013 at 6:27am by aditi
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 - HELP IGCSE
I have a chemistry exam tomorrow and I don't get the double bonding in covalent bonding I tried many websites , textbooks and other books and yet nothing worked Can someone please expain it clearely and in a simple way and please don't put any links for websites ca use...
Sunday, January 27, 2008 at 1:04pm by AMY
chemistry
hi Dr Bob..can you please help me with this chemistry problem? I got problem dealing with the chemical formula.How i want to find the number of moles of 2g of Fe(NH4)2(SO4)2.6H2O???please help me.Thank you
Sunday, August 15, 2010 at 2:01am by tarra
Chemistry
please help! Is RTP in chemistry (thermochemistry and electrochemistry) referring to room temperature of 25degreeC (or 298K) and 1atm, or 20degreeC (293K) and 1atm? In my lecture notes on gas law, they stated RTP refers to 25degreeC, but in my electrochem lecture notes they ...
Sunday, November 6, 2011 at 4:57am by Hailey
CHEMISTRY PLEASE HELP
u kno im just letting u know THIS IS NOT A NOT 2 DO HW FOR KIDS SITE !!! btw - srry about what i said before i didn't know that u hav this seperate u could of wrotw CHEMISTRY PLEASE HELP part 1 then part 2 and 3
Monday, October 24, 2011 at 8:02pm by Laruen
Chemistry B
I need more help then this please, Ive Been out of school for 8 days due to being really sick, and my sister brought bac some work and i have no clue how to do these. Please help me Please.
Monday, April 5, 2010 at 8:53pm by Christy
AP CHEMISTRY
Someone please answer my question below in AP CHEMISTRY.
Monday, March 19, 2012 at 6:27pm by HELP PLEASE
Physics/chemistry
please sir help me with this. I dont get this. This is teh first time in my life i am Asking for help. I would actually like you to help me a lot with this question. Please sir please.
Saturday, February 16, 2008 at 4:23pm by anum
Organic chemistry
please help me with these what are the functional group(s) in Lexiva (Fosamprenavir Calcium)? i only know that it has an amine group but i'm not sure if there is another group!!! and how can i relate Lexiva to chemistry?(ideas please)
Tuesday, December 4, 2012 at 7:36am by leena
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
Need HELP ASAP - PLEASE ` economics
Can i please get this help please so i can get me a place to live for me and my kids please i cry for dis help for 6 years can i please get it and can i please get it bye next weekly please i don't have a job at all and will like to get me and my little family help please ...
Wednesday, July 7, 2010 at 12:35am by Linda Snow
chemistry!
i lost my notes for Stoichiometry and have a final tomorrow. ASAP would be appreciated. im trying to find a site that can help me with balancing word equations calculations:mol,g,liters-gas and determining limiting reagent and % yields. please please please help me.
Tuesday, June 9, 2009 at 8:42pm by chris
chemistry/stiochiometry
could someone please answer my chemistry/stoichiometry questions below both "anonymous one just chemistry on todays date
Wednesday, March 16, 2011 at 5:22pm by "anonymous"
Chemistry(Please, please help)
Have you heard of cis-trans isomerism?
Thursday, November 1, 2012 at 6:37pm by DrBob222
chemistry please help me please!!!
alison is assuming also a monoprotic base.
Monday, July 9, 2012 at 7:29pm by bobpursley
Chemistry
Could someone please explain the concept of electromagnetic radiation to me please? Thank you!
Wednesday, October 29, 2008 at 9:09pm by Marie
Please help with Chemistry due today
please help with the questions that I have submitted.
Monday, May 5, 2008 at 1:12am by Chelsea
Social Studies
Please Help I know but please I'm the parent and my son tell me to check and i don't know 2 much please in your own words please :( :( :( :( please pretty please please please !!!! :( don't give give me links please in your own words please please :( !!!!! Identify...
Saturday, April 6, 2013 at 9:49pm by Alejandra
CHEMISTRY, PLEASE HELP
"MIT2", please refrain from excessive nosiness.
Friday, December 14, 2012 at 6:17am by edX
Chemistry
PLEASE PLEASE HELP How do i find the Empirical formula of CuCl2.5H2O
Tuesday, January 8, 2013 at 7:15pm by Bobert Wells
chemistry
What is the molarity of 5g of O2 in 250 mL? Show work, please.
Wednesday, December 12, 2012 at 7:44pm by please help!
Chemistry
I'm not sure if the above answers are correct, could someone please check them over and let me know?
Wednesday, February 29, 2012 at 10:26pm by Please help.
Chemistry please help
So the ratio of mercury to oxygen will be 2:1 and how can find the empirical formula please...thank you
Wednesday, February 15, 2012 at 2:50pm by Anonymous
Chemistry(Please help, thank you!!)
What is the oxidation number of sulfur (s) in NaHSO3? I know that Na is 1 but I do not know what else to do. Please explain, thank you for your help!!
Monday, September 26, 2011 at 6:53pm by Hannah
Chemistry
Please do it i dont have all the materials and i need to do it today. PLEASE!!
Sunday, February 1, 2009 at 11:02am by James
Chemistry
Please help me with this chemistry question? I am working on a lab report and I am stuck on this question: Use the concept of stoichiometry to explain why balanaced equations are necessary when performing calculations in chemistry. Propose a situation where precise amounts of ...
Tuesday, September 8, 2009 at 1:19pm by Jessie
Chemistry
I can't get 3.175 g. Please post your work. Also, please clarify if the 5.0 is 5.0 g Ag or 5.0 g AgNO3.
Friday, January 18, 2008 at 3:01pm by DrBob222
Chemistry
can someone please to this and post the results PLEASE!!!!!!!
Sunday, February 1, 2009 at 11:02am by michael
chemistry
would you please tell me the calculation....please
Monday, June 28, 2010 at 10:38am by Jetta
Chemistry- DRBOB!! PLEASE?
What text do you have, please?
Tuesday, November 4, 2008 at 11:37pm by bobpursley
Chemistry please check
please need help thanks alot!!!!
Friday, February 15, 2008 at 11:35pm by mike
Chemistry
Hi, I am totally confused with this chemistry because none of this stuff is in my book, so I come to the great ones with my question: 1. Can you show me how to convert celsius to farenheit (please show me an example and your work so I can get it please) 2. farenheit to kelvin...
Sunday, September 24, 2006 at 9:35am by Confused considerable
Chemistry- Someone please help ASAP- PLEASE
I left a note for you concerning your 1J calculation for physics.
Thursday, January 24, 2013 at 7:07pm by Devron
CHEMISTRY
please show working any please MIT2 u are leaving double life wat are u doing here?
Friday, December 14, 2012 at 12:17pm by Anonymous
Chemistry--help me, please
how would you separate Fe3+ from Ba2+ in a mixture? Please explain and give an equation for reaction.
Saturday, October 30, 2010 at 3:59pm by Rocio
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
Chemistry
Someone please answer this. Please! :)
Sunday, March 3, 2013 at 6:19pm by Alexis
chemistry
Thank you; please do and please post his/her response.
Sunday, March 4, 2012 at 5:40pm by DrBob222
Chemistry(Please, please help)
Disregard question.
Tuesday, February 28, 2012 at 8:38pm by Hannah
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 ...
Monday, February 27, 2012 at 11:10pm by Hannah
Pre-Algebra
Well, Can u give me the answer please it because i'm in a rush..... please and later i tell u the rest please please :( :( :( :( ??????? please please
Tuesday, March 12, 2013 at 10:24pm by Destiny
chemistry
calculate the volume occupied by 10^22 molecules of a gas 300 k and 760 mm pressure. please help me please...................
Wednesday, June 27, 2012 at 10:29am by abby
Chemistry
How do the qualities of acids and bases help us in the natural world? Please help-I posted this yesterday and I really don't get it-can someone direct me,please? Thank you
Tuesday, April 27, 2010 at 7:45pm by Sara
Chemistry
Anya, do you know how to do number 4 on the final chemistry exam. Please tell me.
Thursday, December 13, 2012 at 2:35am by Anonymous
Chemistry
Why was Wohler's synthesis of urea significant to the field of carbon chemistry? Please help. Thank you.
Monday, January 24, 2011 at 9:15pm by John
Chemistry :)
Thanks:) Can you please help me with my other chemistry question. I posted it down below! Thank you so much:)
Monday, January 28, 2008 at 3:29pm by Miley
chemistry
Could someone please tell me how to solve this problem: A pressure of 25.7 inHg would be how many kilopascals? Could you please list the steps on solving it. Thanks
Thursday, November 24, 2011 at 11:23am by Sandy
chemistry
calculate the pressure,in atmospheres, of 2.00 mol helium gas in a 10.0-L container at 27 celcius? Please i don't understand any of this? help please?
Saturday, October 16, 2010 at 12:16pm by Shayla
Chemistry
Someone please answer this ;(
Friday, December 14, 2012 at 1:04am by Please
Chemistry
Please don't change screen names. We know that you've posted a succession of chemistry questions.
Tuesday, November 30, 2010 at 10:18pm by Ms. Sue
ChEMISTRY (Help please)
discuss the kinetic theory of gases and proof that the equation pv =1/3 mv2
Tuesday, April 13, 2010 at 8:02pm by chemistry
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 ...
Wednesday, April 18, 2012 at 5:21pm by Hannah
Chemistry
If you want to be a nurse, please learn to follow directions. Your School Subject appears to be Chemistry.
Tuesday, June 21, 2011 at 3:50pm by Ms. Sue
chemistry
please help.....i want to know the metals that have atomic mass less than50 with symbol and valency
Wednesday, May 25, 2011 at 2:41pm by mystery/chemistry
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
chemistry this is confusing to me please help
chemistry. but its done online and i dont have an teacher to sit down and explain the lessons to me.!!
Friday, March 9, 2012 at 2:16pm by princess
Chemistry
If you want a chemistry tutor to respond, please type your School Subject into the appropriate box.
Sunday, August 8, 2010 at 8:16pm by Ms. Sue
chemistry
behavior in chemistry? Please amplify.
Tuesday, October 7, 2008 at 5:56pm by bobpursley
Chemistry (pleas help!)
a stressed chemistry student is hyperventilating into a paper bag. The student stops to wip his brow after a few breaths, and the bag is at 5.7 KPa and the temperature in the lecture hall is 24 degrees C. The bag is 0.75 L full. The student then goes at it again, and ...
Thursday, March 24, 2011 at 12:10pm by Celine
chemistry
Please help me with my formal report on "Potentiometric Determination of the Purity and Dissociation Constant of Potassium Hydrogen Phthalate" Please give me links to websites that could be used for my reference... In addition, please do suggest books that discuss ...
Sunday, August 19, 2007 at 4:40am by Smiley
Chemistry
I..don't understand any of this: 43. How many moles are in 25.0 grams of potassium? Show your work and round your answer to the appropriate number of significant figures. Please, please help with this! Thanks -MC
Friday, October 22, 2010 at 5:07pm by mysterychicken
Chemistry
Please understand that no one here will do your work for you. However, we will be happy to read over whatever you come up with and make suggestions and/or corrections. Please post what you think.
Wednesday, March 11, 2009 at 10:22am by Writeacher
Chemistry
For my Chemistry question it's about herbicide's What do they do? what are they intended for? what risk's do they pose in our society? how are they created? if anyone could answer these please thanks you!
Thursday, January 19, 2012 at 7:55pm by Steven Andersen
Chemistry
Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
Tuesday, June 1, 2010 at 8:55am by Aubrey
Chemistry
Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
Monday, May 31, 2010 at 12:42pm by Aubrey
Chemistry 101
Laura, Eileen -- please don't change screen names. We know it is only you who just posted 5 chemistry questions.
Sunday, February 22, 2009 at 8:10pm by Ms. Sue
chemistry NEED SERIUOS HELP PLEASE!!!!
a)issues of biodegradibility of plastic b)methods of waste disposal and the issues PLEASE HELP THANK YOU
Tuesday, September 27, 2011 at 11:24am by Anonymous
Chemistry- Someone please help ASAP- PLEASE
A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound?
Thursday, January 24, 2013 at 7:07pm by Vic
Chemistry grd 11
Hey thank u for ur answer ... but can u show me with steps from question 4 to 6 please because I didn't get it what u mean there and please can u tell me what the answer will be thank you .....
Monday, November 8, 2010 at 10:57pm by Tarkan
Chemistry - HELP PLEASE
Please help
Sunday, September 25, 2011 at 8:03pm by Summer
Chemistry Help Please
Which of the following is the strongest reducing agent? a) Li+ b) Zn c) Sn d) H2 Is it Li? Can someone please explain what the answer is and why?
Thursday, May 9, 2013 at 2:48am by scilover
chemistry
what is the molality of a 10.5% by mass glucose solution?. density of the solution is 1.03g/ml can someone please explain how to do this question. please and thank you
Thursday, February 10, 2011 at 1:46pm by sam
Chemistry
please I need help with this. what is the difference between molality, normality and molarity? and adhesive forces and cohesive forces? I am very confused. please help thanks
Sunday, October 26, 2008 at 11:17pm by Maria
chemistry - Can you please check
I'm confused again. Can you show me how to get the CaSO4 so I can do the other two? What did I do wrong? I showed you my work. I thought I followed your instructions from Saturday. You said I needed a number near 13. I got the 12.8264. If you could please do the CaSO4, I ...
Wednesday, January 23, 2013 at 7:14pm by Sejul
Chemistry
Can someone please help with this problem and explain it please? If soil has a density of 1.32 g/cm cubed, then what does 1.0 cubic yards of soil weigh in pounds?
Monday, January 21, 2013 at 3:33am by Sally
Chemistry Help Please
i do not understand how to solve this problem, please help 10.0mL 0.5M sulfuric acid can neutralize what volume of 0.5M ammonium hydroxide?
Saturday, March 31, 2012 at 7:08pm by Robert
Chemistry
Hi, I have to take chemistry placement test for college this week. Does anyone here have advice for studying to prepare for the test? I took chemistry in high school 2 years ago so I don't remember anything.
Monday, October 11, 2010 at 9:59pm by Advice please
chemistry please help!!
my chemistry teacher just made it up. i think she wants to know how much to put in so it will explode.is there anyway to solve it even though it sounds akward?
Wednesday, October 22, 2008 at 9:26am by ashley
chemistry PLEASE HELPPPP
hmm in chemistry units usually R = .08206 liter atmospheres / moles degree Kelvin let me see if I can convert that to mm Hg
Tuesday, March 18, 2008 at 8:21pm by Damon
Chemistry- DRBOB!! PLEASE?
molecular orbital theory? my teacher was like "im not teaching it, but its going to be on your test" can you please summarize what it is, i read the online sites,tehy dont make sense...
Tuesday, November 4, 2008 at 11:37pm by Sam
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 ...
Tuesday, April 17, 2012 at 2:05pm by Hannah
Chemistry help PLEASE!!!
The solubility of AgCl(s) in water at 25 C is 1.33x10^-5 M and its deltaH of solution is 65.7 kJ/mol . What is its solubility at 60.1 C ? Please explain how to solve for this!!
Friday, April 20, 2012 at 6:57pm by Marissa
Chemistry
I need to find the boiling point, but I am confused on this question 0.250M glucose in water (assume the density of water is 1.00 g/ml)
Friday, February 15, 2013 at 6:44pm by Please please helppppp!!!!!
Chemistry-Please help
The question is: the arsenate ion has the formula AsO4^3-. Write the formula of the corresponding acid that contains this anion. I don't really understand what I need to do. please help!
Monday, November 5, 2012 at 11:51pm by Thy
Chemistry
Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give me answers. :( a)Determine the number of grams in 0.750 moles of the compound Iron(II)phosphate: Fe3(PO4)2. Answer: ? b)How many atoms of iron are...
Wednesday, March 31, 2010 at 11:41pm by Anonymous
Chemistry
Can Someone describe the structure of ionic compounds for me please.. Ionic compounds consist of a three dimensional array network of + and - ions. I expect you already know that. As to structure, here is a web site that may help. Repost if you have additional questions but ...
Wednesday, November 15, 2006 at 5:01pm by bryan
Chemistry
Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Any help would be greatly appreciated-I'm desperate Thank you
Wednesday, June 2, 2010 at 2:02pm by Aubrey
Chemistry
Could someone please direct me to a website that explains why acid-base titration is a useful technique in chemistry. Or offer your own opinions. Thanks ahead of time for any input!
Wednesday, March 4, 2009 at 10:21pm by Jake
Chemistry
DR.BOB222 ENGLISH PLEASE?????? I know how to get the beta decay for strontium. just having a hard time with the concentration of strontium and the amount of yrs. passed....please help!!
Friday, November 11, 2011 at 6:47pm by Mindy
Chemistry
If you dont mind do you think you can work the whole thing for me? sorry im just not felling good and im hurting. And i have no clue how to do this stuff. Please?
Monday, April 5, 2010 at 8:52pm by Help please
Chemistry
Please help me verify the following question: Consider the following ion; XF2-2 What is the oxidation number assigned to element “X”? Show your work My answer: X F2-2 X -1(-1) X -3=0 X = +3 Please let me know if right. Many thanks!
Tuesday, June 14, 2011 at 7:56pm by Dexter
Chemistry
determine the mass of carbon monxide that is produced when 45.6 grams of methane reacts with 73.2 grams of oxygen gas. Can you please show work in detail please. Thanks
Thursday, March 25, 2010 at 10:39pm by Stacey
Chemistry
Can you determine the mass of carbon monxide that is produced when 45.6 grams of methane reacts with 73.2 grams of oxygen gas. Can you please show work in detail please. Thanks
Thursday, March 25, 2010 at 9:58pm by Stacey
Chemistry
Can someone please help me on this two Chemistry questions...they are from my lab....the lab was on Acids and Bases using Red Cabbage Indicator. Q1- How consistent was the cabbage juice indicator for this lab? Discuss the limitations of using red cabbage juice as an indicator ...
Monday, October 12, 2009 at 5:31pm by Jessie
Chemistry
why is oxygen important for life? Why is Nitrogen important for life? please help me :D
Wednesday, November 30, 2011 at 3:34pm by please help please
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