March 25, 2017

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Number of results: 135,671

How many moles of Hydrochloric acid are needed to dissolve 39.0 grams of aluminum Hydroxide? I just need to write out the equation but I was out and don't know how PLEASE HELP!
January 17, 2013 by Lost

organic chemistry
Which has a higher Rf value Ibuprofen or mefenamic acid? please please please.i need your answers.
December 27, 2008 by lou

I NEED HELP PLEASE!!! I need a 5 paragrph mini theme on " Pizza Is The Perfect Meal". For each paragrphs I need 2 references. PLEASE, PLEASE, HELP SOON.
March 3, 2010 by Lori

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
May 23, 2013 by aditi

AP HS Chemistry
I need help. In simple english please, what is Hund's Rule, Pauli Exclusion Principal, and the Aufbau Principal? I need to know these. Please try to be simple as possible because I'm not understanding right now, haha. Thanks!! :)
July 18, 2011 by Jordan

Please can someone help me before i pull all my hair out i've been struggling with this for about a week CH2=CH-CH-OH ________' _______CH3 i need to polymerize this compound and draw the structural formula it needs to contain three monomer units and i need to state the ...
March 1, 2007 by sarah

I really need help on these chemistry problems. Can you please help me work them. Please?
April 5, 2010 by Help please

Please Help
Can someone please help with the chemistry problems? I need them to study.
October 7, 2013 by Russel

Please,tell me the ways I can use to understand chemistry better.I need help,and it is urgent because am starting to drop.
February 17, 2016 by Miracle

Dear DrBob222 !!! Would you please help me answers the question that I posted. I really don't understand and need help! Please, Thanks
February 19, 2010 by Ashley

Chemistry help please
i need some help understanding this problem please. How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?
March 31, 2012 by Mary

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(...
April 8, 2012 by Hannah

reading...please help
i need to know who the antagonist is in the story money hungry and i need to know what the conflict in the ook is please help me....i really need help i gotta know this by tomorrow!
September 30, 2007 by amanda

Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
May 31, 2010 by Aubrey

Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
June 1, 2010 by Aubrey

I'm doing a lab in chemistry and I need help with a question, here is my data: Mass Before: 26.4 g After burned: 26.25 g Total Mass burned: .15 g 1. Calculate the mass of oxygen that was consumed while the candle burned. I think I need to use mole equations and that kind of ...
December 14, 2015 by Patti

Please I need help in knowing how to solve this. I know I need to take the antilog of something but don't know what.What is the values of [H3O+] for a solution with [OH−]=1×10−5M?
November 22, 2013 by chelsea

Need help on my report on a famous Chemist Would you please help me with my report on a famous chemist, i need ideas on who i should do it on, and i need to identify his/her contributions to my life, and the report has to be one and a half to two pages long. go lik a ...
December 14, 2006 by bobpursley

The websites are confusing! Can someone please explain what a revenue variance is? I want to do my homework for a spreadsheet I downloaded. I just need the definition, please.
May 17, 2010 by Donna needs help

3rd grade
Please help me to rhyming words. The word is sleep. And I need to use this words: strret,please,free,whel,resd,queen,each,sneeze,people,meet,team sea.need,dream,meat. Can you please let me know which one rhym, Thank you. 3rd grader need help!!!!
November 5, 2008 by Elizabeth

Science - Chemistry
I need help I've got 2 books and they both tell me different things. I need to know the 3 different ways of extracting salt, how it's done, the advantages and the disadvantages of each one?? Please Help!!!
May 4, 2013 by Anonymous

I do not need the answers because I do not want to cheat, I just need the questions for algabra1 exams 007027-007032, algabra2 exams 007033-007036, chemistry exams 007606-007610, psychology exams 007097-007101, and spanish exams 389801-389812. Can anyone help I would greatly ...
December 8, 2011 by katelynn

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
June 2, 2010 by Aubrey

"Calculate the pH of 0.10 mol/L aqueous solution of aluminum sulfate." I am also given the ka value for the aluminum ion (9.8x10^-6)...but I don't know why I need it. I'm not even sure if I need to use it. Help please?
May 1, 2010 by Stuck

I'd like to do a titration test, I've got a sulphuric acid solution @ 1M (2N) but I need one @ 0.12N. How many ml of the 1M (2N) solution do I need to add to distilled water to make up 100ml please?
August 2, 2013 by Graham

I need some serious Assisting. PLEASE!!!!I am doing a project on gender and gender roles including identities and the equality and inequality. The Culture is Native American. I need help a.s.a.p. This is my last week in this class. Please, please help me. Thank you so much. I ...
February 17, 2015 by jimmy

College: Chemistry
Hi there, I need help on my homework for chemistry and I do not understand the step on how to work this problem out. Please help me with this problem: On a Sunday morning while having your breakfast you determine that you need about 2.95X10^(5)J to heat water for your tea in ...
February 15, 2009 by Mai

i need help with pf. Please specify what your exact question is and please label your question as to the subject, example, English, algebra, chemistry, etc. We will be happy to help you.
December 6, 2006 by kahyla

a)issues of biodegradibility of plastic b)methods of waste disposal and the issues PLEASE HELP THANK YOU
September 27, 2011 by Anonymous

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
October 26, 2008 by Maria

I really need help!
Hi, I really need instructions. Can someone please tell me how to make a coordinate plane and a rectangle on the plane in Microsoft Excel 2013 please? I really I need an answer soon because this is due today!!!! Please someone help fast! Thank You :/
April 24, 2015 by MusicLover14

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!
November 5, 2012 by Thy

1/10^-8 in scientific notation. I need help please.
October 27, 2014 by Teresa

algebra 1b
i need help!!!!!!!!!!!! Please post your problem and your attempts to solve it. Then we'll be glad to help you. what's the problem? I have a test on wednesday or thursday and I think I'm gonna pass it! I need help with Simplifying i need help with sketching the graph of the ...
October 1, 2006 by unspoken

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...
April 17, 2011 by marie

what is suspension in chemistry? will you please give me a very long explanation about it now.....? I really need it for my project.plz?????? Write your own long explaination, and I will be happy to critique it.
October 9, 2006 by Lawrifel

please i need example of hno3 cuo
May 8, 2013 by lucky

Pre-Algebra please help me!!
X- 0 1 2 3 4 5 6 Y- -7 -4 -1 2 5 8 11 this is a x and y table I need to find out wat the rule is to get y. So the equation would start out like: Y=?????? wat do u need to do with x to get y? and I need help badly! so please!
November 26, 2007 by Ellen

Please help! I need to calculate the enthalpy change of the POCL3.
May 13, 2012 by Lowrence

Hi!! pls i need help! 1) Mg + Al2(So4)3 2)Fe + CuSO4 3)Mg + CuSO4 4)Zn + CuSO4 5)Mg + FeSO4 FOR ALL 5: a)balanced eq b)ionic equation c) net ionic PLEASE HELP ME..THERE ARE SOO MANY MORE QUESTIONS I NEED TO DO!!!:(
February 18, 2014 by Deepa

Social Studies 9
PLEASE i really NEED HELP; and i need this by TOMORROW. -no links please . How and why was Hudson bay company established ?
November 28, 2011 by Stephanie

college algebra--need help Please!!!
I need to find the vertex and axis of symmetry of the folowing quadratic function. Can someone PLEASE help me!! y= -x^2-6x
November 12, 2012 by ladybug

I can’t think of the word- please help!!! Hi. I am writing a story and need to find a word to describe the sound that bowling pins make when they are hit by the ball. The only word I got so far is “Crash”. I need a better word. Any ideas? I have tried a thesaurus, but it...
November 30, 2007 by anonymous

Is DrBob222 available tonight? Please let me know, I need some chem help.
October 11, 2010 by Karen

I need to balance the equation of the reactants NaHCO3->CuCl2 please help me.
March 23, 2014 by Selina

What is the balanced chemical equation Shampoo? please i need a help ASAP!
November 26, 2014 by krisha

6th Grade Science Help PLEASE!
Hi, so I did the coin drop experiment. I finished project, wrote my hypothesis, my data, my observations, and my conclusion. What I need help is that in this experiment I don't know which on is the independent and dependent variable. That's all I need. Can someone please help ...
April 15, 2015 by MusicLover14

What are the short term effects of Cocaine: When someone consumes this substance what effect will it have on their body, mind, and behavior? Please answer ASAP I really need the answer... and please don't give the website for me to find the info, I don't have enough time to do...
June 4, 2011 by Natalie

help please. I need Interpersonal Development characteristics for infancy which is birth till 2 and i need it for earl childhoon which is 2-6 yrs of age please.
July 31, 2008 by dawn

good day! can you please give me the wave explanation for colors? i need it for my report tomorrow. i need an immediate answer please!
July 4, 2010 by Kareen

For the quadratic function f(x) = - x^2 +2x + 6, find the vertex and the axis of symmetry, and graph the function. Again, I need help with this as these are practice examples for an upcoming quiz and I stink at this part of algebra and I need to get it otherwise I won't ...
February 4, 2015 by slomomo

I need to do a project on any one cell organelle and i have started on lysosomes. Its a powerpoint presentation and i need to present it tomorrow. In the procedure packet it says that we need to mention this-"a works cited slide" what does it mean??? what do i need to do? ...
October 16, 2008 by Jessica

This is STOICHIOMETRY. Please i need help in the worst way. I don't understand this at all and it is due tomorrow, please i need someones help who really understands this. #1.aluminum nitrite and ammonium chloride react to form aluminum chloride, nitrogen gas, and water. What ...
May 13, 2010 by Jamie

I need help with this question. What should be the cell potential if the [Cu2+] is 1.0 x 10-5 mol/L? please help
November 11, 2008 by Joshua

I need help on a complex ion equation. I am not sure what the products are. Please help. Fe(OH)2 (s) + NaOH(aq)-->
April 4, 2010 by Anonymous

what is the percent by mass of oxygen in propanal, CH3CH2CHO? the answer is 27.6 %. but i need to know why, please help !
February 2, 2011 by lisa

organic chemistry
I need help with a lab report on extraction of iodine by dichloromethane, please help!
June 10, 2011 by Delia

See i took this practice test and i got a lot wrong i need help its on nature of matter and i need help so my mom can get of my back help me please I'm desperate for help please i beg
January 25, 2010 by Brianna

Calculus Need of Urgent help
find the indicated limits, if they exist. 1. lim (3x^3+x^2+1)/(x^3+1) x-> -infinity 2. find the slope of the tangent line to the graph of the given function at any point: f(x) = 2x +7 Could anyone please, please, please explain to me how to do these problems? It seems like ...
February 8, 2011 by Anonymous

If 325mL of a 0.58 M solution of a propanoic acid (a fatty acid) was mixed with excess glycerol what is, the maximum number of molecules of fat or oil that could result?(you will need Avogadros number = 6.022 X 10 to the 23rd power)....I need to show all work and im completely...
December 3, 2014 by Jennifer

I urgently need to know where I can get a sort of dictionary of terms on microbiology. 1) I need to translate technical terms from Italian into English used to describe the results of a microbiological analysis conducted on water. 2) In addition, I need to know the English ...
January 21, 2012 by Henry2

hi can someone please help me I need a detailed scientific article about ozone depletion thank you
August 11, 2009 by bill

If you want to lose 1 pound of "fat," which is 20% water, how many kilocalories do you need to expend? i don't know where to start :( Please Help!!!
September 8, 2011 by steph

I posted my science (chemistry) question and I have received no help and i really need to get this done so can someone please help??
April 3, 2014 by Anonymous

Speech 09
I need to create a communication model in my speech class. My characters are Scout and Jem (TKAM) I need to write a communication model script. It should have these words in them: Context, message, feedback, channel, Encode, Decode, receiver, sender, paralanguage, interference...
February 10, 2013 by Darcy

I need help with 2 questions please. 1.What are the three parts of the law of conservation of mass/matter? Do not need the definition but the 3 laws please. Wikipedia and other sites just gives me the definition of the law of conversation. 2. How are velocity, speed, and ...
November 29, 2012 by Please Please Help

I need help with two problems need helps please!! 1) Calculate the surface area in nm^2 of a water solution contained in a watch glass with a diameter of 5.6cm. Remember that the area of a circles is calculate as A=πr2 and diameter= 2r 2) If a molecule of stearic acid ...
October 6, 2014 by Paul

I have 2 questions that I need help with please. 1.What are the three parts of the law of conservation of mass/matter? Do not need the definition but the 3 laws please. 2. How are velocity, speed, and acceleration related? I know how they are different only. Thank you
November 29, 2012 by QUICK PLEASE HELP

Speech 09
I need to create a communication model in my speech class. My characters are Captain Hook and Peter Pan. I need to write a communication model script. It should have these words in them: Context, message, feedback, channel, Encode, Decode, receiver, sender, paralanguage, ...
February 10, 2013 by Leyla

If you need any extra information please ask How could someone have calculated the dilution of the HCL from 20.0 cm^3 to 250 cm^3?
October 26, 2011 by ?

What mass of water is needed to react com- pletely with the Na2O2?
March 11, 2015 by Farrell

Could you translate these phrases for me? I need a pencil and a piece of paper please. Do you need a book or a notebook? I have a dictionary but I need a calculator. Thank you!
August 25, 2014 by Janey

Need Help!! Describe how to make 2.5L of 0.1M HCL solution from 12M HCL concentrated solution and water. I got help earlier but still could not figure out the calculations. Please help, it has been a while since i took chemistry. Thank you soo much
August 29, 2012 by debbie

Computer Science
Help me please! I need help with Floating Point Notation when converting biary and regular numbers! Please. I just need some help and would appreciate it greatly. Also instant message me at TRbal10. Thank you
October 14, 2007 by Tiler

hi, i need help on this assigments can you help me please i need to find the following definitions please help me. 1. The danger of overdiagnosis 2. The power of diagnostic labels 3. The confusion of serious mental disorders with normal problems 4.The illusion of objectivity
November 23, 2009 by maria

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 ...
March 24, 2011 by Celine

Please I need help...I have been trying so hard to finad this answer... Suggest a test chemical that can be added to the water sample to precipitate the lead(II) ions. please show a chemical eqaution for the formation of the precipitate. Thank u so much:)
April 25, 2010 by Stacey

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 ...
October 23, 2010 by mysterychicken

2Na + 2H2O---> 2NaOH + H2 Need to find the molecules of H2 Atomic wt o Na = 23 48.7 g of Na 48.71/23 = 2.12 mols Na 2.12/2 × 24. (WHERE DOES THE 24 COME FROM) = 25.44 dm^3 H. (PLEASE EXPLAIN THIS PART) = 1.06moles 1.06mols× 6.02×10^23 avagados number= 1.204 × 10^24 ...
January 7, 2017 by lulu

chemistry help!!! please!!! DrBob222 I need you!!
How many atoms of carbon are needed to produce 0.45 mol Al? 3C + 2Al2O3 4Al + 3CO2 A. 2.6 × 1026 atoms B. 9.7 × 1024 atoms C. 3.0 × 1022 atoms D. 2.0 × 1023 atoms I'm really very stuck with this question. please help me!!!
August 20, 2016 by emma

I need help with Chemistry homework.. I don't know how to write formulas..Please help me! Write the formulas for silicon dioxide.
May 8, 2014 by Angela

i need help thinking of Criterion for my evaluative essay..i'm writing on a piece of literature..i need to write what criteria i'm going to use to evaluate the work.. i really need help with this..i need to come up with atleast 4 criterions and i'm stuck please give me some ...
February 16, 2009 by Bella

I need help please. "what voluma [in mL] at STp will be occupied by 0.0035 mol of methane [CH4]" THANK YOU SOO MUCH!
May 21, 2008 by Mandy

Balance the following equation in basic media CLO3 (-1) +I (-1) --------->CLO2 +I2 please i need the final answer too
May 1, 2011 by Liz frank

Chemistry - Please help
I need help with answering this question. Thanks! What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
October 6, 2013 by Anonymous

HELP PLEASE - Chemistry
I need help with answering this question. What is the absolute entropy of 1.9 mol of gaseous ammonia at 2.8 bar and 298 K?
October 7, 2013 by Anonymous

i have to do a "chemistry of cooking" project for my chem class. for the project i need to convert pounds, grams, and ounces into moles, but i do not know how. for example, i need to convert 453.5g of beef into mols. how do i do that? do i need to know the chemical formula of ...
February 18, 2010 by joyce

How do you find the number of valence electrons in a molecule? Do I need to use the Lewis structure diagram to find out? Please help! I need to the total number of valence electrons for SiH4, H2SO4, CCl4, BF3 and I don't know how!
February 10, 2010 by Anonymous

Sorry to post this again, but I am still unable to understand it and need help. Please help.1) Using 3(x-3)(x^2-6x+23)^2 as the answer to differentiating f(x)=(x^2-6x+23)^3/2, which I have been able to do, I need to find the general solution of the differential equation dy/dx...
May 22, 2011 by Claire

N2H4+2H2O2->N2+4H2O a) If you start with 23.0 g of hydrazine and 23.0g of hydrogen peroxide, which substance is the limiting reactant? b) How much of the other chemical is left unreacted? c) Assuming 75% yield, how many grams of water are formed? I have no idea how to do ...
September 16, 2007 by Trevor

Hi everyone, I really need help with this problem. What is the reactant, products, and what compounds is it? Is it H2O, O2, or what? What are the transition molecules? Help please. Do as below to get to the image. I couldn't put the URL in and it isn't my website. I just found...
June 17, 2012 by Anonymous

I am writing a speech and It about a boy named Edward and he lost her mom when he was young. I need a hook in a question format. Please help. What should I write. Ex: Have ever realize...... I need something similar to this. Please Help!!!!!!
March 5, 2013 by Darcy

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...
October 10, 2010 by Kim

I NEED HELP ON THis WORLDS PLEASE i need the definition please 1. Performance goals 2. Mastery goals 3. The effect of praise 4. Expectations and self-efficacy
November 23, 2009 by cielo

I NEED HELP ON THis WORLDS PLEASE i need the definition please 1. Performance goals 2. Mastery goals 3. The effect of praise 4. Expectations and self-efficacy
November 24, 2009 by cielo

This question I really don't get it. I tried tried tried to figure out how to start solve the problem but still couldn't figure out. So can you help me with one question PLEASE? If so, can you please explain to me how you get the answer? Also can you show me step by step of ...
June 14, 2012 by Laura

I NEED HELP ON THE NEXT WORLDS PLEASE i need the definition also please 1. Performance goals 2. Mastery goals 3. The effect of praise 4. Expectations and self-efficacy
November 23, 2009 by maria

I NEED HELP ON THE NEXT WORLDS PLEASE i need the definition also please 1. Performance goals 2. Mastery goals 3. The effect of praise 4. Expectations and self-efficacy
November 23, 2009 by maria

Lang Arts
I need help on this book called the outsiders if anyone has read this book please email me I really need help its on a oral presentation so Ty please help!!
September 29, 2008 by Kenny

If you need to make a solution of 1.0L at 2.5M citric acid and you only have 45mL of 5.0M citric acid, do you have enough for your experiment? If a mathematical procedure is involved, please explain to me; I really want to grasp this chemistry concept.
June 11, 2014 by Lie-ma Been

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