Friday
October 24, 2014

Search: Chemistry (repost)

Number of results: 46,760

question repost damon
Since some tutors dont check back, i want to repost this to damon: what percent more than 1/3 is 3/5? It said 3/5 was wrong, and I tried but i don't know what happend
September 12, 2014 by Bobby

Bobpursley can you help me with my problems below?
I had problems from yesterday but I still don't get them can you help?do you want me to repost? repost: I cant find them.
March 4, 2007 by Margie

Science [repost]
What is the difference between an ionic bond and a covalent bond? I just keep forgetting which one is which...any easy way to remember these? PS> I know that you're not supposed to repost until 24 hours but I really need this answer! Thanks -MC
February 5, 2009 by mysterychicken

english
Homework Help Forum: brain teaser help Current Questions | Post a New Question Answer this Question | Further Reading Posted by sam on Sunday, April 2, 2006 at 3:34pm. try to find the error. I couldn't; it's very hard. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z did ...
September 10, 2006 by chris

history
on the 1st page can someone please help me??????? Its the 2nd and 3rd black dot next to my nasme. Even if this is a repost, more information needs to be given before we can adequately respond. Please repost with more information. Thanks for asking.
April 29, 2007 by Mack

Science repost for help
Sciece (chemistry) - help, Tuesday, September 25, 2007 at 4:32pm what is the particle theory
September 25, 2007 by Ms. Sue

chemistry [repost]
In a recrystallization of vanillin, can you purify a substance whose solubility decreases as the temperature increases? Any help is appreciated!
June 23, 2008 by Anonymous

To Ron: Chemistry 12
I've deleted your 14 chemistry questions because you've made no attempt at answering them. This is not a site to dump homework questions like so much garbage to be disposed of. If you'd like to repost any of them with your answers, someone may be able to check them.
November 24, 2009 by Ms. Sue

Chemistry
Repost:: sorry couldn't understand it What is the concentration of C2O4^-2 in a 0.370M oxalic acid solution? Ka1=5.6x10^-2 and Ka2=5.1x10^-5
March 20, 2013 by V

History *repost* (sorry!)
After the Gupta Empire collapsed, what group gained control of much of India? Muslims from Afghanistan Buddhists from China*** Christians from Ethiopia local Hindu princes Which of the following was NOT a part of the organization of the early Christian church? the pope the ...
October 6, 2014 by SkatingDJ

Chemistry
Can you please look at my repost. I made an error in my question, so now I need your help for a different part of the question. :) Thanks. -Sadie
February 14, 2009 by Sadie for drwls

Science
What is the boiling point of ethanol when the atmospheric pressure is 60kPa? I decided to repost this ? under Science instead of Chemistry. Thanks.
April 14, 2012 by Gerald

CHEMISTRY REPOST
Calculate the concentration, in percent by mass, of a refrigerant brine solution which is 4.03 M in NaCl with a density of 1.116 g mL-1. detailed answer, please, i dont understand how to do this at all!!!
November 10, 2007 by keely

algerba!2!
(-2x2y)3 * (5xy3)2 *I don't get this on at all!!! Are there any exponents in this one? If so, repost showing the caret to indicate the exponent. oh sorry I forget to do that.LOL!Here it is now: (-2x^2y)^3 * (5xy^3)^2 Are there any exponents in this one? If so, repost showing ...
November 8, 2006 by Sandro!

To Lynn,Alex,Physics_student,Natasha
Please refrain from reposting the same question within a short time (less than a day). If you do repost, add "repost" at the end of the subject. Quadruple posting within an hour and a half means that teachers have to spend time reading the extra posts, which actually slows ...
October 6, 2009 by MathMate

Chemistry
Repost .. Saccharin is a weak organic base with a Kb of 4.8X10^-3. A 0.672-g sample of saccharin dissolved in 30.0mL of water had a pH of 12.34. What is the molar mass of saccharin?
March 20, 2013 by V

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...
April 17, 2011 by please, help me

Science [improv/repost]
What is the difference between an ionic bond and a covalent bond? I just keep forgetting which one is which...any easy way to remember these? PS> I know that you're not supposed to repost until 24 hours but I really need this answer! Would this answer work?: In an ionic ...
February 5, 2009 by mysterychicken

Chemistry -repost thank you in advance
I have a bottle of 95% ethanol purchased from the manufacturer. Normally, when it is not stated, does it mean 95% w/w ethanol? I need to prepare 100ml of 40% v/v ethanol solution from 95% ethanol. Please show me the calculation steps. Thanks.
September 20, 2010 by annie

corrected repost chemistry
to what volume should you dilute 125mL of an 8.00M CuCl2 solution so that 50.0mL of the diluted solution contains 5.9g CuCl2 I have a hard time determing the M1V1=M2V2 is
November 6, 2011 by Monique

Pre-Algebra [repost]
I'm sorry I had to repost, but this is urgent and i need it done by today!! Can someone please show me how to do these problems? I've been trying but I'm having a hard time... 1.Simplify the expressions on each side of the equation to obtain an equivalent equation: 5x + 12 + ...
May 2, 2009 by mysterychicken

Repost Repost Bio
I asked this, and didn't get a very helpful response. Question: hi, i did this lab, from this website and I was wondering if anyone could come up with 3 sources of error, and they can't be human error. Thanks! You are saving me! Seeing as I am not allowed to post to the ...
February 26, 2008 by InSANELY URGENT(Science teacher help)

chemistry repost!!
The mole fraction of acetic acid (CH3COOH) in an aqueous solution is 0.675. Calculate the molarity of the acetic acid, if the density of the solution is 1.0266 g mL-1.
November 10, 2007 by keely

Chemistry repost
A student determined that ethanol was the best solvent to use for a recrystallization based on small scale trials. When the recrystallization was carried out on a larger scale, no crystals were obtained on cooling the hot solution. Why? and how would you overcome this problem???
January 25, 2009 by Matt

chemistry repost
What is the boiling point of an aqueous solution that freezes at -6.7 degress C. Please help. I feel retarded because it seems like its something real easy but Im still not getting it. I did 100 + 6.7 and got 100.67 and are you sayin to divide 1.86 by .52 which is 3.576. the ...
November 5, 2011 by swtnblk

chemistry repost
help, i'd like to know how to do this titration question: for example: a 1g sample of naoh contaminated with na2co3 is titrated with 0.500MHCl, and it is found that 46.5mL of HCl are required for neutralization. Find the percentage by mass Na2Co3. ( i did not make up these ...
April 21, 2008 by alex

Just a repost, in case the old isnt seen
sorry! I never noticed..the mass should be 52000kg sorry about that! For Further Reading physics repost - Alexis, Sunday, October 14, 2007 at 6:07pm so it should be a 52000kg train slows from 25 m/s to 14m/s in 5.0 s. Calculate the work done on the train. so I found the ...
October 14, 2007 by Alexis

My algebra repost
1)
April 18, 2007 by Antonio

math (repost)
y =x+2 y =x^2
April 8, 2008 by michael

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 ...
November 15, 2006 by bryan

Chemistry
Ermms just cant get my head around this question kinda bugging me :( Solid Sodium Hydrogen Carbonate dissolving in water i know its a dissociation reaction but i dont really have an idea where to split the compound. sorry about the repost, im new to this site and i aint really...
August 25, 2008 by (:

Chemistry (repost)
Pb(s) + KNO3(aq) ----> No reaction HNO3(aq) + Sr(OH)2(aq) ----> H2O + Sr(NO3)2 NO3 being Nitrate, and (OH)2 meaning 2 Oxygen and 2 Hydrogen atoms in the second problem. The second two in the products of the second problem is a subscript for NO3. Are these correct? Thank ...
January 31, 2009 by Momo

About Posting
sorry for repost ~C
August 16, 2007 by ~christina~

Chemistry-Repost
Known: Cyanaocetic acid Ka=3.55*10^-3 ionization equation: HC3H2NO2<==> H^+ + C3H2NO2^- Unknown: pH of 0.4M of Cyanaocetic acid How can I find out the pH of 0.4M of Cyanaocetic acid ? Is there another way solving for it other than using ICE chart? Please help me out.I ...
April 21, 2009 by anonymous

math (repost)
if f(x)=2x-1 and g(x) 1/2 (x+2) calculate a)f(3) now if 2(3)-1=5 how do i find for gf(3)????
April 14, 2008 by cassie

algebra repost
simplify radical sqrt a^10
July 24, 2009 by Melissa

To Danii
I cannot read your 11:55 post. Can you repost it here?
May 20, 2010 by Jen

english
sorry i havent really used this site and im not sure how to repost my question instead of putting it as an answer to my question so heres the repost: I had to find embedded clauses I deplore the fact that bats have wings. --> bats have wings That Guinevere loves Lorian is ...
July 7, 2008 by Anonymous

Abby
Please repost your question, I accidently deleted it.
April 9, 2008 by bobpursley

6TH GRADE MATH
Repost perimeter is 30 and area 36
November 29, 2010 by William

algebra 117
repost sorry about that (k^1/8)^-4 oer(k^7)^1/2
July 22, 2012 by BERNIE

science
Can you direct me to a site(s) which can help with college chemistry and statistics? Here are a couple of good chemistry sites that pretty well cover the waterfront. I don't know any stat sites but if you will repost with the subject line of "math" I'm sure someone will help ...
February 19, 2007 by jules

Chemistry (repost)
Determine the volume of 0.240 M KOH solution required to neutralize each of the following samples of sulfuric acid. The neutralization reaction is shown below. H2SO4(aq) + 2 KOH(aq)---> K2SO4(aq) + 2 H2O(l) a) 26 mL of 0.240 M H2SO4 b) 143 mL of 0.14 M H2SO4 for a I got ....
March 19, 2011 by Rebekah

Chemistry-Repost for DrBob222
The reaction OH- + NH4+ = H20 + NH3 is kinetically first order in both reactants' concentrations. The rate constant is 2e10 1/M s. If 50 ml of .01 M NaOH is mixed with 50 ml of .01 M NH4CL, find the time required for the OH- concentration to reach 1e-4 M. Your answer: It ...
March 21, 2014 by Anonymous

History opinion repost for Kate
Is the Bayeux Tapestry an accurate source? Why or Why not?
April 28, 2009 by Ms. Sue

Math (repost)
Given f(x) and g(x)=f^-1(x). If f(1)=4 and f'(1)=-3, then find g'(4). ...No idea where to start with this. Please help? Thanks much!
April 27, 2010 by Nikki

Algebra(repost of one question)
Bobpursley: 89. Solve for x in the equation: (6/7)x - 6 = -2 I got x=28/3
May 1, 2010 by y912f

Algebra (repost)
Can you help me on this problem as well? (or anyone.) Solve each inequality and check your solution. h - > -7 4 (bumping)
May 10, 2010 by Dean

Repost 2 PLz Help
6-y/y^2-2y-24=? *I don't get it at all!!! You need parentheses around portions of this thing so we know what the problem is.
February 20, 2007 by steve the hippo

repost Calculus
the length of the curve of intersection of the cylinder (4x^2) + y^2 = 4 and the plane x + y + z = 2 I'm so lost. Any help is appreciated!
April 24, 2009 by Anonymous

Algebra
|a+2 3z+1 5m|+|3a 2z 5m|=|10 -14 80| |4k 0 3 | |2k 5 6| |10 5 9| I needed to repost this. This is a matrice and I am trying to find the values of the variables in each equation.
December 17, 2009 by mike

chemistry HMWK help....... REPOST
you decide to have a BBQ in your backyard. you have 1Kg of pentane (C5H12) in the tank. What is the amount of carbon dioxide (in mass and mols) you will be contributing to the greenhouse gas effect by using up that 1Kg of pentane? plz.... need the answer with steps...thank you...
November 11, 2010 by tarkan

ethnics help
sorry to interrupt is someone available for help. Please repost with your question, and we will do our best to help. Thanks for asking.
November 2, 2006 by minemine

REPOST biochem
i don't understand this why can carboxyl and phosphate groups act as acids? as in, what makes an acid?
October 18, 2007 by J

chemistry(check my explanation)
sorry to repost this question but i'm confused on this part The solubility of borax is directly proportional to temperature. Therefore, the sign of H is A. negative B. positive C. unknown with the given information like you said earlier, borax dissolves when heat is added, ...
April 5, 2010 by eng

egg protection
how can i protect an from a 6m fall and make it go 3m please look at your question. It makes no sense to us. Repost it
March 5, 2007 by chris

repost
bobpursely, I posted at 709 from our previous dialogue, can you please help me again? Much appreciated!
September 30, 2007 by RSVP

Science - Repost for ?????
which moon is the brightest from the surface of jupiter? this question is driving me BLOODY crazy 4 my homework!
June 24, 2008 by Writeacher

physics repost
Calculate the force of gravatational attraction between two spheres of mass 10.1 kg and 45.4 kg that are 38.5 m apart. F = G(m1)(m2)/r^2 = 6.67 x 10^-11(10.1)(45.4)/38.5^2 = 2.06 x 10 ^-11 N
April 3, 2008 by Jon

To Happy --
Please repost your math question -- and remove Ms. Sue's and my screen names from YOUR NAME'S space. Thanks. =)
February 8, 2009 by Writeacher

Grammar [Repost]
Is this an adverb phrase? The tangy scent of barbeque drew us TOWARD THE LITTLE CAFE. Thanks -MC
May 12, 2009 by mysterychicken

algebra repost
Simplify each expression. Assume all variables represent nonzero real numbers. -40^0- 30^0
July 24, 2009 by Melissa

AP Chemistry (repost)
some reactions that are considered to be spontaneous at low temperatures will not proceed at a measurable rate or form any measurable quantity of products for several hours, days, or years. a. explain why this is. b. will the addition of a catalyst alter the value of delta "G...
December 5, 2009 by anonymous

ap chemistry
oxidation- reduction reactions What about them. Here is a site that may help you or repost with a more specific question. http://members.aol.com/profchm/redox.html
October 29, 2006 by Brianna

math
2Tons=____oz Try the method DrWLS or I showed you. Then repost if you don't understand but tell us what you are having trouble with.
November 30, 2006 by brooke

English
Bloom's taxonomy, anyone? (Yeah, it's a repost.) Anything found on the wiki or the first page of google I've tried.
September 11, 2007 by Samantha

physics repost
A 1.00-kg ball is attached to a string of 0.50 m and swung in a horizontal circle with a velocity of 2.00 m/s. Find the centripetal acceleration. ac=v^2/r = 2.00^2/.50 = 8.0 m/s^2
April 3, 2008 by Jon

To "Cutie..."
Please choose a better "First Name" -- make sure it's not offensive in the least! Then repost your question. Thanks. =)
July 7, 2008 by Writeacher

MzLynn - auditory learning
Your post has been removed. We'll be glad to help you if you repost it along with your attempts to answer the questions.
January 17, 2009 by Ms. Sue

Physical Science
if you tear a piece of material in haft, how is the density affected? sorry i repost it, just the title
October 11, 2012 by Laruen

Pre Calculus Repost Please Help
Can someone help me solve this problem: cos^2x + 5cosx - 2= 0 I am having some trouble finding x
February 5, 2009 by Anonymous

To Ray -- college
I've removed your biotechnology post. Please repost it with your thoughts about completing it and specifically how you would like us to help you.
February 17, 2009 by Ms. Sue

math repost
name two numbers with decimal hundredth that round to the same whole number but different tenths.
October 12, 2012 by marco

Chemistry
What are charateristic of a ionic bond and a chemical bond? Answered below for characteristics of ionic bonds. I don't understand characteristics of chemical bond since an ionic bond is a chemical bond. Perhaps you can rephrase your question. For my partial answer look on this...
November 30, 2006 by Pretty in Pink

French for Anonymous/E.G.
If you go back before the "repost" I found the first post just now! There is an answer there. Sra (aka Mme)
November 18, 2008 by SraJMcGin

To Sha -- Child Development
I've removed your lengthy post asking you to comment on a complex scenario. Please repost with your analysis of this situation. We'll be glad to help you then.
February 27, 2009 by Ms. Sue

Math(repost of #2 of last ?)
Write XY(with line over it) as the sum of unit vectors for X(8,2,-9) and Y(-12,-1,10). There's an example just like this in my book but I really don't understand it.
April 25, 2009 by Jon

science-repost! please help
Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this
January 17, 2013 by Samantha

chemistry
Does this equation need to be balanced? AlCO3 => AlO+CO2 Also, how would this equation be balanced? NiCl+O2 => Ni2O3+Cl2O5 Neither equation you have is an equation so they can't be balanced. Do you mean aluminum carbonate. That would have the formula Al2(CO3)2. Aluminum ...
December 14, 2006 by Carter

Repost: Biology!
What would be the consequences of the following be on photosynthesis? These are the only ones I am stuck on! a.) Photosystem I is not functional b.) NADP+ is not present in the thylakoid space
March 23, 2008 by HELP! PLEASE SOMEONE ANSWER!

physics repost
Which of the following physical properties can be used to measure temperature using a thermometer? A)volume B)pressure C)density D)viscosity I got A
April 4, 2008 by Jon

True or False econ repost
Relative PPP is a better approximation of reality when one of the two countries is suffering hyperinflation and the other is not.
May 29, 2008 by wilde

Pre-Algebra [repost for Reiny]
In my last post for #1, I asked my teacher and she said that it's actually k=30 . Could you have gone wrong somewhere? That's the only one. -MC
May 1, 2009 by mysterychicken

Chemistry-Repost
Write formula equations and net ionic equations for the hydrolysis of sodium carbonate in water. Responses Chemistry - DrBob222, Friday, April 24, 2009 at 10:50pm The hydrolysis of Na2CO3 ends us as the hydrolysis of the carbonate ion. The molecular formula is Na2CO3 + HOH==...
April 25, 2009 by anonymous

ap chemistry
what does H2 + CH2 form? (what product?) What is CH2? There is a (CH)2 but I don't know of a CH2. Yes, I meant to ask: What product is formed by this reaction: H2 + (CH)2 My original answer is gone but I will repost. (CH)2 is HCtriplebondCH which is acetylene. H2 gas adds ...
October 29, 2006 by sara

Science
I dont noe ne thng about fluids. HELp..my test is in two days If you repost your question and spell the words right, I'll help you. lol pwnT
January 30, 2007 by Sana

government
describe a hypothetical situation in which collective naturalization might be applied? We do not do your homework for you. However, if you will repost your answer, we will be happy to proofread and give suggestions.
May 7, 2007 by angie

To: Troyer0269 - Sci245
I've removed both of your science posts. Please repost when you can tell us what you've done so far to fulfill these complex assignments and where you specifically need our help.
February 8, 2009 by Ms. Sue

To: Computer -- Cultural Diversity
I've removed your post with the complex assigment about subordinate groups. Please repost it and tell us what you've already done on this assignment and how we can help you complete it.
February 11, 2009 by Ms. Sue

Repost PLease Help!
d+7/d^2+49= / (d+7) (d+7)*I got the bottom but I don't know what to put at the top...please help!!! answered below
February 20, 2007 by steve the hippo

physics repost
Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 W/m2. F
April 19, 2008 by chris adison

Calculus - repost
Find the derivative of F(x)= integral from -2 to x of sqrt(t^3+8)dt? My answer: sqrt(x^3+8)? Is this right?
September 6, 2008 by Amanda

To JMartina
Please do not post your e-mail address here. Repost your question, please.
June 19, 2012 by Ms. Sue

Chemistry
I'm having difficulty on drawing lewis dot structures for certain compounds and figuring out the molecular shape. I can do the simple ones like IO4- which is tetrahedral...but i'm stumped on ICl4-. When i drew the structure I thought it was octahedral, but my textbook says it'...
October 7, 2006 by Melissa

Repost physics
PLEASE SOMEONE HELP ME!! I POSTED DOWN AT AROUND 10 something!! PLEASE!!! I NEED HELP!!!
September 30, 2007 by Cooper-Nichol

physics repost
sorry! I never noticed..the mass should be 52000kg sorry about that!
October 14, 2007 by Alexis

S.S. Repost for Brittani
S.S. - Brittani, Friday, October 26, 2007 at 5:47pm Where are charges for the impeachment made?
October 26, 2007 by Ms. Sue

MATH Introduction to Math Skills and Strategies
Evaluate when x+y/3 when x=17 and y=4 sorry had to repost the question thank you
November 15, 2009 by nikki C

Chemistry
Express the following in mol/kg [H+]in a water with a pH of 6.8? Ok, so the pH=-log10[H+]. Here we have a pH of 6.8 so we have... 6.8=-10log10[H+] solving we get... [H+]=10^-6.8 mol/L converting from Liters to m^3 and dividing by the density of water we get... (10^-6.8 mol/L...
January 20, 2007 by Jan

Physical Science
According to the well known equation, energy equals mass times the speed of light squared..... ? You question is unclear. Please repost with more specifics.
March 29, 2007 by Gina

Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Search
Members