April 20, 2014

Search: I don't understand this chemistry problem?

Number of results: 116,694

I don't understand how you do (b), I got 173kJ for (a) and I understand Hess's law for (c), but (b) I really don't understand (b)
Wednesday, March 30, 2011 at 8:52pm by Chem

It doesn't help us help you if you simply say you are confused without telling us what you understand, what you don't understand, and if possible, why you don't understand.
Wednesday, December 8, 2010 at 5:14pm by DrBob222

Would you spend a few minutes telling me what you don't understand about Le Chatelier's Principle? This is such a simple concept but students get confused. Perhaps if you tell me what is so daunting, I can understand and pitch my answers to help you understand. Just giving the...
Sunday, September 19, 2010 at 10:19pm by DrBob222

I shall be happy to help you understand what you don't understand but I'm not a fill in the blank resource.
Friday, May 4, 2012 at 9:35pm by DrBob222

Didn't I do that for you. What exactly (be specific) do you not understand. Copy and what I answered and show what you don't understand.
Tuesday, October 30, 2012 at 1:17pm by DrBob222

How much of this do you not understand? I don't want to spend my time going over material you already understand.
Wednesday, October 28, 2009 at 2:15pm by DrBob222

I don't understand it. To you is simple and basic but to me is very hard subject to understand and solve. Thank you anyways for your help.
Sunday, March 25, 2012 at 12:30pm by Lisa

I understand everything except the van't Hoff factor part. I do not understand how you figure that out.
Friday, February 10, 2012 at 10:58pm by Hannah

I understand how to do the steps. but the wording is different on this problem, that is what I don't understand?
Wednesday, July 13, 2011 at 10:35pm by dan

This take a LOT of typing. Exactly what do you understand and not understand?
Thursday, February 6, 2014 at 11:05am by DrBob222

I need help with the equilibrium constant, i understand it but I dont understand the last step when you have to change or find the exponent?
Wednesday, April 6, 2011 at 7:28pm by HS

C'mon. Get serious. If I don't know what you don't understand about this I can't help you. To start can you balance the equation? If so do so. If not why can't you. Go from there with the next thing you don't understand.
Sunday, February 3, 2013 at 2:02pm by DrBob222

I do not understand the acid + base ->conjugate base + conjugate acid Please explain it to me with an example. I really do not understand it and I truly need your help. I do not understand how he hydrogens transfer and stuff like that. Your help is very much appreciated! ...
Sunday, March 24, 2013 at 9:35am by Krystien

You should know how to do this. If you have trouble. here is a site that may help. If you don't understand, post again but tell us what you don't understand.
Sunday, May 18, 2008 at 6:37pm by DrBob222

I have plenty of help and I am pleased to help you as much as I can but I don't do homework. Again, I won't work the problem for you but tell me what you don't understand and we can get started on it. What do you not understand about pOH = -log(OH^-)?
Wednesday, May 7, 2008 at 9:32pm by DrBob222

9th chemistry
so how do i know which one is correct? If i understand correctly you said it could be Na2HPO4 or NaH2PO4... also i don't understand how there can be +1 Na and then a -3 PO4... wouldn't it then have to be Na3 to balance? sorry i'm really lost
Friday, January 2, 2009 at 9:35pm by alexa

You may want to rethink this post. I doubt you will get any takers for a 2 hour work assignment. If you wish to repost with an explanation of exactly what you don't understand about ONE of the problems, please do so and someone will help you understand that concept.
Monday, October 11, 2010 at 12:24pm by DrBob222

The rules you need to work on, if it isn't too late, are as follows: 1. Don't get behind. 2. Understand all you can. Ask questions. See the teacher during office hours. Memorize that which you simply cannot understand. 3. Work the problems at the end of the chapter. 4. Study ...
Sunday, May 11, 2008 at 9:54pm by DrBob222

How much of this do you not understand? That is, how much can you do. Show what you don't understand. I'm not likely to spend a lot of time writing equation you already know how to do.
Saturday, April 2, 2011 at 11:55pm by DrBob222

yes I understand, and this helps a lot, but what I don't understand, is why in one trial the delta s was higher than in another trial, could you explain why that happened?
Monday, December 9, 2013 at 7:24pm by K

I understand how to balance equations when the full equations are given to me but I don't understand how to write a single replacement reaction. Help Me??
Monday, January 24, 2011 at 8:30pm by Jessica

I did explain the numbers. Post the answer and ask about each step you don't understand but explain fully what you don't understand.
Tuesday, May 28, 2013 at 3:49pm by DrBob222

And you may not understand the way I do it either. Instead of us posting until you do, why don't you post how it should be worked and tell us, in detail, what you don't understand about it.
Saturday, September 20, 2008 at 4:58pm by DrBob222

How many kilojoules of heat are absorbed when 1.00L of water is heated from 18 degrees C to 85 degrees C? Can you please explain how to do this problem? I do not understand what to do, or understand the formula.
Wednesday, May 19, 2010 at 10:23pm by Sarah

Work the problems. Understand what you work and understand the definitions. Memorizing problems won't work. Memorizing definitions won't work if you don't understand them. Talk with your teacher and ask if he/she can pinpoint the problem you are having. If you are into the ...
Sunday, October 14, 2007 at 4:29pm by DrBob222

a) Mg + 2H2O ==> Mg(OH)2 + 2H2 single replacement/displacement What do you not understand about this. It seems simple enough. I shall be happy to explain anything you don't understand.
Monday, October 10, 2011 at 11:17pm by DrBob222

I do not understand how to right a balanced equation for the combustion of cellulose in oxygen to produce carbon dioxide and water vapor. I know that cellulose is C6H10O5 but I don't understand how to balance. Thanking you in advance for your help.
Thursday, March 27, 2014 at 11:51am by linda

Geographers need sociology to understand other cultures. They need history to understand the backgrounds of these countries. They need math and econ to understand their economic situations. They need languages to understand the works written in these different languages. They ...
Wednesday, August 12, 2009 at 10:34pm by Ms. Sue

Hi Jonny. I didn't understand this question when you posted it yesterday. I still don't understand it. The energy in gasoline originally comes from the energy of the decaying trees, vegetation, etc,from which we get oil and coal, from which gasoline is separated, cracked, and/...
Monday, February 4, 2008 at 3:30pm by drbob222

What is wrong with or ambiguous about hte phrase "four molecules of NaCl" I really dont understand my textbook says in the back that it is an ionic compound so I guess that its not really a molecule then I don't understand...
Friday, July 2, 2010 at 10:27pm by Kate

If 25 grams of copper(II) sulfate pentahydrate were heated until all water was removed, how much residue would remain?- Could someone help me understand this question? I don't understand it at all. Thanks
Sunday, February 3, 2013 at 5:28pm by Shadow

Do you understand what they are asking? Which of the following physical properties can be used to measure temperature using a thermometer? volume pressure density viscosity Im guessing they are talking about viscosity but I dont quite fully understand it
Monday, May 5, 2008 at 9:56pm by Jamie

I dont understand how to write the net ionic equations for the foration of the three possible precipitates formed in steps 2 3 and 4 im guessing for number 1 we are dealing with barium and siver for sure and i dont understand 3 at all
Wednesday, August 11, 2010 at 4:17am by annonomus

Family and Consumer Science
Thank You! :) Now I understand it Thank you Ms. Sue for explaining it cleary for me to understand. and Thank You Bob for giving me examples for me to understand.
Monday, February 13, 2012 at 6:46pm by Laruen

Don't guess. Calculate it. I have posted the work below. By the way, I want to address a remark you made last night about "How do you remember all this stuff?" Early on in chemistry there is a lot of stuff that we must take on faith so we memorize it. Things like symbols, ...
Tuesday, May 11, 2010 at 9:29pm by DrBob222

I don't understand the problem. I get the T and D scales and I understand that the T scale is -10 to 80. On the D scale, however, did you mean ice melts at 20 on the D scale and boils at 100 on the D scale?
Monday, August 9, 2010 at 12:26pm by DrBob222

sorry to bother you again, but I understand how to add the values, but how do you add the equations, i understand everything else except for adding the equations, as i am not sure how to do that. Thanks.
Sunday, July 19, 2009 at 4:26pm by Cori

Chemistry - Help!!!
C is correct. I don't understand why F is also true; in fact, isn't F true regardless of the reaction. I understand that the entropy of the universe is increasing and there is no mention of a reaction.
Tuesday, May 3, 2011 at 6:36pm by DrBob222

Hi GK, For the first step, isn't (1/10)(0.0020) = 0.00020 M? Also, I understand your very clear explanation to the last step: [SCN-] = 0.0010 -C I understand the minus C part, but how did you get 0.0010? Thank you!
Friday, August 8, 2008 at 6:48pm by tiff

Organic Chemistry
Thank-you for taking the time to help me understand the question. I think I understand, would the following statement be correct: Alcohol would not be a base, because in order to be a base the molecule must accept a proton.
Saturday, February 16, 2008 at 4:36pm by Bethany

I understand the question but not the parenthetical part. Ignoring the part in parentheses, use (P1V1/T1) = (P2V2/T2) note: I understand vapor pressure to be the pressure of the gas above and in equilibrium with a liquid. If gas Q has a pressure of 750 mm Hg at 287 K I don't ...
Friday, June 29, 2012 at 12:36am by DrBob222

I dont understand 3a and 3b. I dont understand how you do that
Sunday, September 27, 2009 at 7:12pm by Jason

You have a lot of questions here that are multiple guess. You need to be specific about what you don't understand. While we give some short answers to some of these, it doesn't help you for us to do your work for you. You need to understand how to do them yourself.
Tuesday, March 23, 2010 at 5:43am by DrBob222

radioactive sodium chloride is appropriate for diagnosing circulatory problems, but radioactive xenon is helpful in searching for lung problems. Explain why. I understand different elements are used for specific parts of the body but I don't understand this question. Thanks ...
Sunday, April 14, 2013 at 8:06pm by Sara

ok i understand what you said but we've estanblished that the frequency decreases. i don't understand what velocity has to do with anything b/c wavelength = v/f. I'm just confused on this one. my first answer was it stays the same but them I changed it but I don't fully ...
Saturday, April 5, 2008 at 2:50am by Jon

Correct. Do you understand what I did to balance the gain and loss of electrons? Do you understand how to determine the oxidation state of an element? If not, I can give you a web site that is fairly good for the oxidation state. And for balancing redox equations. Here they ...
Thursday, July 3, 2008 at 3:30pm by DrBob222

Chemistry Help ????
If you can't get the answer from there it must mean that you don't understand all or portions of what I wrote for the answer. Thus it will do little good for me to simply repeat what I wrote (which I had started to do but stopped). Therefore, please explain what you don't ...
Sunday, November 23, 2008 at 6:40pm by DrBob222

10th grade chemistry
why would a firefighter or a reporter need to understand chemistry?
Monday, April 6, 2009 at 6:44pm by Anonymous

@DrBob222 - I understand up to the part about the conversion of mol to 2.65 mg. I understand that the enthalpy change is 121.3 kJ/mol for Cl(g) and that would be the reactant part of the equation. But whats the deal with working with 2.65mg and the delta Go?
Saturday, April 3, 2010 at 5:34am by Spider

Organic Chemistry
I'm doing the same thing but I do not understand it fully. All of my general chemistry knowledge is gone.
Tuesday, May 18, 2010 at 1:25pm by me

Why would a firefighter or a reporter need to understand chemistry?
Wednesday, September 5, 2007 at 8:52pm by John

Ohhhhhh I understand now.. I thought that I did the freezing point wrong since you said I got the wrong answer.. But I understand now. THANK YOU SO MUCH! Sorry for taking up so much of your time!
Tuesday, August 6, 2013 at 9:26pm by Desz

I don't understand the question. You calculated mols only, not grams. I can calculate g sulfate or I can calculate grams sulfate in a 0.7 g sample of alum but I don't understand what the two have to do with each other.
Sunday, September 23, 2012 at 8:10pm by DrBob222

I am working on a solid chemistry problem, but I do understand what e^ means. Is it the elementary charge? or Faraday constant. Please help.
Saturday, November 16, 2013 at 7:16am by FHD

I still don't understand how to do this problem; grams/molar mass I understand, but I need to see the steps CLEARLY. 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 ...
Saturday, October 23, 2010 at 9:57am by mysterychicken

Exothermic reactions are favored because they release heat to the environment. Would an exothermic reaction be more favored or less favored if it were carried out within a superheated chamber? I don't understand what "favored" means, so I don't understand the question.
Monday, November 30, 2009 at 1:00am by Mary

I'm currently learning about balancing chemical equation but I don't understand the equation below. 2FE + 3CL(subscript 2) -> 2FECL(subscript 3) I understand 2FE balance out but how did 3CL2 became CL3? Thanks
Sunday, December 16, 2012 at 9:53pm by Shadow

chemistry urgent
You need to learn to do these so I don't intend to do this for you. However, if you follow the steps in the link I gave you (or if you follow Bob Pursley's instructions) you should get where you want to go. Post any steps you don't understand with your work. We can help you ...
Tuesday, November 30, 2010 at 4:33pm by DrBob222

about Engineering
Electronic and Communication Engineering is mainly Mathematical analysis, implemented in practical circuits. You have to understand higher forms of math, and think in those terms. You have to understand the imperfect models used for systems analysis. You have to understand ...
Thursday, May 24, 2007 at 6:41am by bobpursley

Chemistry II
C6H12O6 + 6O2 ==> 6CO2 + 6H2O dHrxn = (n*dHf products) - (n*dHf reactants) -2816 = [(6*-393.5)+(6*-285.9)] - (dHfglucose)= -2816 Solve for dHf glucose If you still don't understand, explain what you don't understand about it instead of just a blanket I don't get it.
Sunday, March 3, 2013 at 8:44pm by DrBob222

This is the fourteenth chemistry question you've posted in the last hour under various names. Do you really not understand these questions or are you fishing for answers?
Saturday, June 19, 2010 at 6:54pm by Ms. Sue

Drbob, It is apparent that you understand Chemistry. I on the other hand do not. I here looking for direction, not to play silly mind games with you.
Sunday, July 8, 2012 at 8:06pm by Anonymous

Algebra 1
in the first step, what happened to the S? I understand how you got -5, but I don't understand what happened to S. i understand everything else, just that. would S = -5?
Monday, February 18, 2008 at 4:46pm by Elizabeth

I worked this for you below. You didn't look or you don't understand? If you don't understand, go step by step and be specific about what you don't understand.
Sunday, July 15, 2012 at 10:08pm by DrBob222

I can't understand the whole thing that he said. (What is the meaning of the sentence? 1. I can't understand what he said at all. 2. I can't understand some(?) of what he said. 3. I cann understand almost all the things that he said, but not all.)
Friday, August 20, 2010 at 3:59am by rfvv

I can't understand the whole thing that he said. (What is the meaning of the sentence? 1. I can't understand what he said at all. 2. I can't understand some(?) of what he said. 3. I cann understand almost all the things that he said, but not all.)
Friday, August 20, 2010 at 8:10am by rfvv

Your second paragraph bothers me somewhat. You did not understand a lot of the assignments, but you wonder why you are getting bad grades? Could be, you don't understand the material. On the first paragraph: Did you understand the concept of Fallacy? Did you cover ...
Thursday, March 15, 2012 at 10:51pm by bobpursley

An unknown element reacts with bromine to give bromide, MBr3. If 2.809g of the unknown element gives 27.765grams of MBr3, what is the element? ( give the symbol ) I dont understand the M in the MBr3...can someoen please help me with this question ASAP thanks a lot - i know ...
Tuesday, September 27, 2011 at 8:32pm by S-rth

I understand how to balance the rest of the equation, but I just don't understand how to balance the Fe^+2 and Fe^+3 ions on both sides of the equation.
Monday, June 29, 2009 at 8:00pm by DSL

Why do we put a minus sing in front of the bond enthalpies of the bonds that are being formed? And why are the enthalpies of formation negative in general? I also don't understand why we subtract the enthalpy of formation of the reactants from the enthalpy of formation of the ...
Saturday, April 3, 2010 at 11:58pm by Anna

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

But I'm not laughing and you shouldn't be. What is it you don't understand about P*molar mass = density*RT? This is worked the same way and with the same formula your post right above was worked. I don't do your homework for you; I just HELP you do it. And I'm ready to explain...
Saturday, November 26, 2011 at 3:54pm by DrBob222

I assure you there was no criticism. Those equations I gave you above will do them all. If you have further problems, please explain what you don't understand and we can help you through. You must understand that this is a help board and if we show you how to do one problem, ...
Tuesday, December 11, 2012 at 11:15pm by DrBob222

chemistry help
Nitric acid,HNO3, is available ata a concentration of 16 M. how much would react with 5.58 g of KOH acording to the following equation? HNO3+KOH-H2O+KNO3 dont understand? does not give me a volume amount to work with and I really dont understand how to solve it
Sunday, November 21, 2010 at 6:17pm by nicole

you can also order the UPCO's Physical Setting CHEMISTRY... it has many helpful equations and it will make it easier to study and understand evrything... plus the book is cheap too.
Monday, March 29, 2010 at 4:38pm by chemistry challenged

Chemistry Help Please :)
I don't understand the question. I understand that the varsol will be the top layer and it dissolves the I2 in a non-polar solvent so the color is pink. The lower level is water and it dissolves the KI/I2 mixture of KI3 to form a brown color. The brown color forms because the ...
Sunday, February 12, 2012 at 6:29am by DrBob222

General Chemistry
I showed you how to do this earlier. Here is a link. We don't do all of your work for you but we try to help you understand the problem. Rather than posting a note to post the correct answer, it would be far better, if you still don't understand, to follow the instructions as ...
Monday, May 17, 2010 at 3:02pm by DrBob222

m nt good at physics .....i don't understand physics so well .....i try to do the problems but they don't make sense at all i ask it here ...and wen someone helps me ...i understand them and then only write them ......m not cheating .....i just need help to understand ...
Tuesday, May 15, 2012 at 7:37pm by myra

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

I don't understand what you mean by dividing it into the required ratio. I understand where you got the ratio from, but do you mean 24.26/1.00 = for sodium and 24.26/1.54 = for chlorine?
Tuesday, September 4, 2012 at 2:23pm by Tatiana

Math (trigonometry)
But in the triangle I was thinking of/the one I drew, the mountain is inside triangle ABC...? I don't really understand why I would have to take the supplementary angle of 22.3; I'm not disagreeing with you, I can see that you're right, I just don't understand how and I want ...
Sunday, December 2, 2012 at 5:30pm by Sammy

Calculate the average translational kinetic energy (kJ/molecule) for a molecule of NH3 at 431 K, assuming it is behaving as an ideal gas. I understand how to figure out the kJ/mole, but I don't understand how to get the kJ/molecule that this question is asking for. Can someone...
Sunday, April 11, 2010 at 11:37pm by Luc

sorry for the delay.. I don't understand. I do understand that a new 1000 is not needed because once added, it's still 1000 but as as far as the rest, I don't understand. Trying to help my daughter with her math homeworl!
Tuesday, September 20, 2011 at 6:14pm by Melissa

sorry for the delay.. I don't understand. I do understand that a new 1000 is not needed because once added, it's still 1000 but as as far as the rest, I don't understand. Trying to help my daughter with her math homework!
Tuesday, September 20, 2011 at 6:14pm by Melissa

College Algebra
What part are you having trouble with? Do you understand the equation for slope-intercept form? Do you understand how to calculate slope? Do you understand how to find the y-intercept?
Saturday, November 17, 2007 at 9:41pm by Michael

This is a lot of work and you need to know how to do this type problem. So tell us what you understand, how much you can do, and what you don't understand and we can help you through it. I'm not interested in spending the next hour typing the answers just so you can check your...
Monday, February 18, 2008 at 8:51am by DrBob222

Geometry 1
I understand that no one does work for anyone else here, but I do suppose that i could have stated my mis-understanding better. I didn't understand whether A was a fixed point or not. ... yeah. I feel stupid. Anyway, I understand it now, so i suppose that a 'thank you' should ...
Sunday, September 13, 2009 at 7:54pm by Kayte

Well I just started Chemistry...Monday. I'm home-schooled and only have teachers from nine in the morning to noon. And I payed $50 for this course. Okay, I'll re-read the chapter to see if I understand anything.
Wednesday, September 24, 2008 at 9:12pm by W I C K E D

I'm so rry, but I don't understand what you're saying. I understand this method usually, but it's the fractions that are getting me. I just don't understand how you go from 2/5 to 3/5 and then go from 1/10 to 3/10.
Monday, May 6, 2013 at 6:50pm by Kim

Hi, I am doing a practice test for my chemistry final and I do not understand one of the answer they gave for this thermochemical equation question. I do not understand how they got 400kJ. The question is: Butane has a deltaH of -2871 kJ/mol when it undergoes complete ...
Wednesday, June 19, 2013 at 12:45pm by Matilda

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

I'm working on chemistry homework, and I just came across a few issues I don't understand. For one, why isn't Sodium Bromide NaBr2 (Online sources show it as NaBr)? Isn't Bromine a diatomic element?
Thursday, January 20, 2011 at 6:31pm by Eric

WHat? I don't understand???
Thursday, February 28, 2008 at 5:38pm by Miley

that's what I don't understand! :(
Thursday, September 11, 2008 at 8:09pm by alice

Ok, I understand. Thanks
Saturday, November 29, 2008 at 9:12pm by Anonymous

I understand
Thursday, July 8, 2010 at 5:54pm by Derrick

i do not understand this
Tuesday, March 15, 2011 at 1:44pm by Anonymous

I don't understand! ! :(
Sunday, October 16, 2011 at 6:28pm by BIlly

i don't understand
Saturday, December 10, 2011 at 5:05pm by Maame

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