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April 16, 2014

Search: chem lab (webwork)

Number of results: 16,858

chem lab (webwork)
D is correct - based on the first paragraph of the lab instructions for week 2.
Saturday, April 3, 2010 at 12:02am by UCI student 2

chem lab (webwork)
see below.
Tuesday, April 13, 2010 at 7:20pm by DrBob222

chem lab (webwork)
Both answers are 8. I don't know why or how, though.
Tuesday, April 13, 2010 at 7:19pm by ktcat

chem lab (webwork)
the answer is 7 for HCL and 8.72 for HC2H3O2
Tuesday, April 13, 2010 at 7:20pm by AC

chem lab (webwork)
the answer is NOT d!!...i just did it and got it wrong -__-
Monday, April 5, 2010 at 1:04am by BOB

chem lab (webwork)
its not a...i just did it right now n it said INCORRECT! :(
Monday, April 5, 2010 at 1:04am by el cucuy

chem lab (webwork)
You need to know if the acid/base is 1:1 or not. If 1:1 you may use a simple mL x M = mL x M If not 1:1 you must go through moles and coefficients.
Tuesday, April 13, 2010 at 7:19pm by DrBob222

chem lab (webwork)
for HCL, which is a strong acid, the answer is 8.00 mL For the other acid, which is a weak acid, you must use the ka formula
Tuesday, April 13, 2010 at 7:20pm by random21

chem lab (webwork)
No you were right. Colligative properties are not dependent on the molar mass of solute, only on the mass of solute. I'm 10000% percent sure. Trust me. Molar mass of solute...the answer is D.
Monday, April 5, 2010 at 1:04am by j'et

Lab in general
I just read my syllabus for lab and I am kind of shocked at what it says. I do know that I have to write out procedures of the lab in my nbk before coming to lab but I just read that it says "You will NOT be allowed to refer to you textbook/handout during the lab period" Is ...
Monday, September 3, 2007 at 1:31pm by ~christina~

Chem Lab Help
I wanted to know if any one has done the Determination of ASA Content of Tablets Lab Report. I need help doing the post lab questions
Tuesday, December 4, 2012 at 2:21am by Latica

chem lab (webwork)
can you please elaborate i'm still unsure because .1 M NaOH x .0018 L = 1.8E-4 mol NaOH and .1 M HC2H3)2 x .008 L = 8E-4 mol HC2H3)2 so that means that HC2H3)2 is in excess. after this step i am lost so can you please tell me how to find the salt produced and the other steps.
Tuesday, April 13, 2010 at 9:36pm by anonymous

chem lab (webwork)
Complete the table below: How much 0.10 M Base (in mL) is required to neutralize 8.00 mL of the 0.10 M acid? Base Acid Base Volume (mL) NaOH HCl NaOH HC2H3O2
Tuesday, April 13, 2010 at 7:19pm by need help student

chem lab (webwork)
How much 0.10 M Base (in mL) is required to neutralize 8.00 mL of the 0.10 M acid? Base Acid Base Volume (mL) NaOH HCl NaOH HC2H3O2
Tuesday, April 13, 2010 at 7:20pm by anonymous

chem webwork
What's the question?
Monday, July 12, 2010 at 6:48pm by DrBob222

CHEMISTRY (WEBWORK)
the answer is h
Tuesday, July 6, 2010 at 8:35pm by chem student

Chem Webwork
Complete the table below: What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted with 100 mL of water (like it will be in the experiment you perform in lab)? mL NaOH: 0.70 pH w/ HCl: 2.14 pH w/ HC2H3O2: ??? I got pH w/ HCl, but I can'...
Monday, April 25, 2011 at 4:25pm by Michelle

chem lab (webwork)
What is the pH of the solution created by combining 1.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH wHCl pH wHC2H3O2 1.80 Complete the table below: What are the pH values if you take into account that the 8....
Tuesday, April 13, 2010 at 9:36pm by anonymous

Chem 1LC
Honestly, I'm so over WebWork. A) .7 B) M C) M, J
Monday, May 3, 2010 at 1:26am by dangf

Chem Webwork
nevermind, i got the answer
Monday, April 25, 2011 at 4:25pm by Michelle

Chem Webwork
See my response above.
Monday, April 25, 2011 at 4:25pm by DrBob222

chem webwork
Yes, it is increasing halogen atom size
Monday, July 12, 2010 at 6:48pm by Anonymous

chem lab (webwork)
When a good indicator has been chosen, the pH at which the solution changes color is very close to the point of the titration. Complete the table below: If this "point" for a particular titration occurs at pH x, a good indicator for for the titration would be ______________. ...
Tuesday, April 13, 2010 at 7:19pm by need help student

chem lab (webwork)
Which of the following is NOT true of colligative properties? Colligative properties are... A. dependent on the mass of solute present. B. independent of the chemical identity of the solute. C. responsible for lowering the vapor pressure of a solution versus the vapor pressure...
Saturday, April 3, 2010 at 12:02am by UCI studebt

science(chem)
Oh...okay but the lab question was actually a fill in sheet for the actual lab when I do it. Thanks Dr.Bob =)
Monday, September 3, 2007 at 12:11am by ~christina~

chem lab (webwork)
Subtract HAc moles - NaOH moles. The difference = moles HAc (acetic acid) remaining. Amount NaOH added = moles Ac^-(acetate ion) produced. pH = pKa + log ([base)/(acid)] where base is the acetate and acid is the acetic acid.
Thursday, April 15, 2010 at 11:05pm by DrBob222

chem lab (webwork)
Your question is tough to decipher. The basics. moles = M x L. Determine moles acid. Determine moles base. Determine which is in excess. Determine the salt produced. For solutions in which the salt is not hydrolyzed, use the reactant in excess and calculate H^+ or OH^- ...
Tuesday, April 13, 2010 at 9:36pm by DrBob222

chem webwork
I can tell you its NOT decreasing acid strength and its NOT Increasing electronegativity.. your guess is as good as mine.. : //
Monday, July 12, 2010 at 6:48pm by Cecily

chem webwork
its increasing halogen atom size...i just answered it and thankfully got it right
Monday, July 12, 2010 at 6:48pm by Anonymous

chem lab (webwork)
A crazy question. It doesn't matter what solute is used UNLESS it is an ionic one versus a non-ionic solute. I would not know to pick B or not; technically, it doesn't matter what the solute is (it depends upon the number of dissolved particles) BUT it depends enough upon the ...
Saturday, April 3, 2010 at 12:02am by DrBob222

chem lab (webwork)
The answer is A. Let me legitimitize my answer; Since you can use the freezing point depression equation to find the molar mass of the solute, the molar mass obviously has an effect on the freezing point. I think its pretty clear that C is true. B is true by the definition of ...
Monday, April 5, 2010 at 1:04am by Santa Clause

chem lab (webwork)
i was working on this with two friends, one tried E and the other tried B and they both got the answer wrong. I thought that colligative properties depended on whether a solute was volatile verses nonvolatile and not on if it is ionic or not. I was thinking D, but I don't have...
Saturday, April 3, 2010 at 12:02am by UCI studebt

chem lab (webwork)
i was working on this with two friends, one tried E and the other tried B and they both got the answer wrong. I thought that colligative properties depended on whether a solute was volatile verses nonvolatile and not on if it is ionic or not. I was thinking D, but I don't have...
Saturday, April 3, 2010 at 12:02am by UCI studebt

Chem
Doing it in the lab IS one way of solving some of these problems and lab work is quite important; however, one must ALSO know how to calculate the answers. A good chemist must know how to do both; that is, must be good in the lab as well as in theory. In this case, the problem...
Monday, October 29, 2007 at 4:00am by DrBob222

chem lab (webwork)
What is the pH of the solution created by combining 1.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH pH wHCl pH wHC2H3O2 1.80 Complete the table below: What are the pH values if you take into account that the 8....
Thursday, April 15, 2010 at 11:05pm by anonymous

chemistry
I don't know the answer to this question but I put the answer given above is wrong if you are doing the uci webwork from chem 1LB
Friday, January 15, 2010 at 2:16am by zot!

chem webwork
It is increasing halogen atom size... For those who care, look at the plots in Spartan and you can automatically rule out Increasing Electronegativity and higher dipole values.
Monday, July 12, 2010 at 6:48pm by Awesome

chem 121
We did a lab separating out the components of a mixture. One of the lab questions is "The weight of naphthalene was obtained by weighing the collected solid. Was this an accurate weight of the naphthalene present in the original sample?" I don't know how to answer this.
Sunday, October 17, 2010 at 8:08pm by Martha

chem lab
My lab is on Comparison of the B-carotene content of raw and cooked carrots...if you use a single 5.0g piece of carrot, do you expect to extract more or less B-carotene than with the finely cut carrot sample? explain.
Monday, May 5, 2008 at 10:55pm by natash

chem webwork
A. Increasing halogen atom size. B. Decreasing acid strength. C. Shortening of the C-C bond. D. Increasing electronegativity. E. Higher dipole values going from F to Cl to Br. cant paste the spartan stuff... whats the answer?!?!?
Monday, July 12, 2010 at 6:48pm by Anonymous

chem lab
hi im doing a post lab sheet for chem class. and im having a little trouble. i have: temperature 12.6 C -> 285.6 K Time 816 sec but im supposed to find 1/T(K) it looks like my classmate did this: 12.6 x 285.6 = 3598.56 however they gave me the response to group 2 also: and ...
Saturday, October 16, 2010 at 9:08am by chem

Chem Lab
9.5 yes. 5 no.
Wednesday, April 11, 2012 at 11:21pm by DrBob222

Microbiology
How can lab practices and safety precautions help reduce hazards in a lab setting? How do you handle blood cultures and pathogenic strains in a lab to minimize contamination?
Friday, May 3, 2013 at 12:06pm by Sara

Chem Pre-Lab HELP!
THANK YOU!!!!
Tuesday, February 23, 2010 at 9:52pm by Macey

Chem 2068 lab
thank you for your help!!
Monday, October 18, 2010 at 9:12pm by Car

CHEM
titrant lab
Monday, September 21, 2009 at 10:17am by ncsu

CHEM LAB Help
What are you titrating?
Tuesday, October 16, 2012 at 10:32pm by DrBob222

Chem Webwork UCI
Complete the table below: What is the pH of the solution created by combining 0.70 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH: 0.70 pH w/ HCl: 1.08 pH wHC2H3O2: 3.23 Complete the table below: What are the pH ...
Monday, April 25, 2011 at 4:50pm by Michelle

chem lab
with an ICE chart.
Tuesday, May 10, 2011 at 2:00am by DrBob222

chem lab question
is this what you wanted?
Monday, August 6, 2012 at 11:27pm by joan

Chem Webwork help
1. What is the pH when enough 0.10 M Base (in mL) is added to neutralize 8 mL of 0.10 M Acid? Complete the following table. NaOH HC2H3O2 2. What is the pH of the solution created by combining 2.60 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of ...
Monday, July 12, 2010 at 2:34am by Sammy

Chem Lab
I did a chem lab and have to figure out some stuff off of some data I found during the lab Weight of empty crucible and cover: 19.74 g Weight of crucible, cover and hydrated salt: 22.74 g Weight of crucible, cover and hydrated salt after 1st heating: 22.13 g Weight of crucible...
Monday, October 8, 2012 at 9:52pm by Aliya

Chem Lab
I did a chem lab and have to figure out some stuff off of some data I found during the lab Weight of empty crucible and cover: 19.74 g Weight of crucible, cover and hydrated salt: 22.74 g Weight of crucible, cover and hydrated salt after 1st heating: 22.13 g Weight of crucible...
Monday, October 8, 2012 at 10:37pm by Aliya

science(chem)
Yeah...but I didn't get it from there if that's what your thinking..It's from my lab book that I just got a week ago Dr.Bob. Technically I wanted to go and figure out what would theoretically happen if I mixed them before my actual lab I would have done the same if I was doing...
Monday, September 3, 2007 at 12:11am by ~christina~

Chem Lab
distillation of what? melting point of what?
Wednesday, September 12, 2012 at 10:52pm by DrBob222

Chem Lab
@Drbob222 2-methyl-2-butanol
Wednesday, September 12, 2012 at 10:52pm by Justin

CHEM LAB Help
Forget it i got the answer
Tuesday, October 16, 2012 at 10:32pm by Den

Chem Lab
I don't know how to obtain theoretical yield.
Friday, November 2, 2012 at 12:56am by Cris

Chem lab last question!! Urgent help
THANK YOU SO MUCH!!!
Wednesday, February 27, 2013 at 10:27am by Kim

chem 221 #2
Do not have the lab protocol .
Wednesday, February 27, 2013 at 6:47pm by Devron

Biology
I really need help with my science lab. I was sick when we did the lab on Thursday and Friday was a snowday so I did not get to get the observations off my peers. My teacher has allowed people one more day and I do not understand this Lab at all. If someone could help me write...
Monday, March 5, 2007 at 6:47pm by Scott

science(chem)
What is Zimmerman Reagent made of? (I know it is acidic b/c I was told after it burned a hole in my jeans) acid? You must mean Zimmermann-Reinhardt reagent (79 g MnSO4, 100 mL of concentrated H2SO4, and 200 mL of concentrated H3PO4, diluted to 1 L) Zimmerman reagent is equal ...
Monday, July 16, 2007 at 4:23pm by christina

science
help with the chem lab. the molecular of a volatile liquid.
Thursday, November 29, 2007 at 8:30pm by Bmt

chem lab
You don't give enough information for me to know the question.
Tuesday, March 25, 2008 at 12:07am by DrBob222

chem
no, this is from my lab book. and furthermore, i am not able to solve it.
Sunday, April 20, 2008 at 11:06pm by Seraphine

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

ORGANIC CHEM LAB
Nevermind! Figured it out :)
Monday, September 26, 2011 at 11:53pm by Anonymous

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

Chem Lab
Thank you, it should say 'used' not 'sued'.
Wednesday, April 11, 2012 at 11:21pm by Logan

ap chemistry
I agree on the tutor. Also, get another text (college used book store) to see the same material in differing words. On the ap chem board exam, nationally, most do not do well. I have to be honest, most ap chem students need to retake college chem if for nothing else, the lab ...
Sunday, November 4, 2012 at 4:07pm by bobpursley

science(chem)
No, I wasn't saying (or thinking) any of those things. I was thinking that someone got that lab question you are working on from the web OR that this is someone's check in sheet from a lab. I think most of your "guesses" are ok on this and I think your procedure is good; i.e...
Monday, September 3, 2007 at 12:11am by DrBob222

Chem
this is not done in lab. it's supposed to be calculated. people, like you, fail.
Monday, October 29, 2007 at 4:00am by Anne

Organic Chem I Lab
DrBob222 how about some help here?
Tuesday, November 30, 2010 at 4:54pm by mike

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

chem lab (webwork)
Which of the following is NOT true of colligative properties? Colligative properties are... A. dependent on the mass of solute present. B. independent of the chemical identity of the solute. C. responsible for lowering the vapor pressure of a solution versus the vapor pressure...
Monday, April 5, 2010 at 1:04am by UCI studebt

science(chem) Dr.Bob-> need help on this long lab
HI
Tuesday, March 11, 2008 at 5:27pm by MP

chem
Thanks Dr.Bob for all your help, I'll make note of that when I do lab tomorrow =D
Monday, September 3, 2007 at 11:17pm by ~christina~

organic chem lab
why should benzyl chloride be added with a syringe
Wednesday, July 5, 2006 at 9:41pm by Anonymous

chemistry
My friend, you are amazing! DrBob for Chem President!
Friday, April 4, 2008 at 5:07pm by Tim's Titration Lab

chemistry
I am disappointed in western students....the day before your lab as well
Tuesday, November 23, 2010 at 12:01pm by Chem TA

organic chem
Evacuate the room and call tell the lab instructor.
Thursday, September 1, 2011 at 11:02pm by DrBob222

Conductivity
chem lab uci 2012! suffering with this a year later =/
Wednesday, January 12, 2011 at 9:47pm by anonymous

Conductivity
YEA UCI chem lab where 2units > 4 units
Wednesday, January 12, 2011 at 9:47pm by Alex

chem 221 #2
during the lab preparation of synthetic banana oil
Wednesday, February 27, 2013 at 6:47pm by Jazzmine

Chemistry
Ap Chem lab on Determination of the Molar Mass of volatile liquids.
Saturday, January 20, 2007 at 10:34pm by Anonymous

Organic Chem I Lab
Any guess on my part are pure speculation so it's better if I don't speculate.
Tuesday, November 30, 2010 at 4:06pm by DrBob222

CHEM LAB Help
mustard solution, how would i calculate the mass of naOH used?
Tuesday, October 16, 2012 at 10:32pm by Den

Organic Chem I Lab
I had to do this same reaction, only I used 10g NaBr and 25 mL of sulfuric acid, also without success. When my partner and I set up the distillation following reflux, our distillation apparatus blew apart because our lab instructions neglected to direct us to add a boiling ...
Tuesday, November 30, 2010 at 4:54pm by Mariah

Chemistry Titration Lab HELP!
Go to google and type in titrations lab. The 6th result "Performing Titration Lab" has lots of information and even a virtual titration tool that you can use to get the hang of it!
Wednesday, June 11, 2008 at 2:11pm by BADAMS

science (chem)
an addition to this is Why doesn't my lab in organic chem use plastic pipettes? Is it going to react with the organic solvent if you do use it instead of glass? And it's kind of annoying that the liquid in the pipette has a tendency to go into the bulb while I'm transfering ...
Sunday, September 9, 2007 at 10:16pm by ~christina~

Chem
I am doing a lab on enthaply of vaporization of water, I got everything else on the post lab but these two questions, please help. The deltaHvap data from the handbook reference vary with temp. 1) if your data were perfect, but deltaHvap is not constant, how would this show up...
Wednesday, February 13, 2013 at 11:44pm by Please please helppppp!!!!!

chem
help me i hev a lab You need to post a question with details about what yo don't understand.
Wednesday, March 21, 2007 at 7:03pm by cool

chem lab
hmmmm.....look it up on google, do you know anything about the Wright Brothers?
Thursday, November 13, 2008 at 5:23pm by Alexa

Chem Lab
Why should the temperature be kept 48C during distillation? is it because of the melting point?
Wednesday, September 12, 2012 at 10:52pm by Justin

Chemistry-Lab-
You need a standard to see how good the chemistry and/or your lab techniques are. If you don't come up with the right answer then either the procedure is not very good or your lab technique is lousy.
Saturday, October 1, 2011 at 1:29pm by DrBob222

AP BIOLOGY LAB
I am doing an ap biology lab on plant photosynthesis. It's specifically lab # 4 on plant pigments and photosynthesis and it's on question # 8 on Exercise 4B: Photosynthesis/ The Light Reaction. Identify the function of each of the cuvettes. I already have gone to the lab bench...
Sunday, November 2, 2008 at 7:12pm by Roger

Chemistry labs in highschool
I was curious to know whether it was standardized practice to have labs for chemistry classes in highschool. I personally have never had labs for chemistry in highschool. In my state we have the Regents. You may or may not have heard of this test, but the reason I mention it ...
Thursday, August 23, 2007 at 12:02am by ~christina~

basic chem lab question
what is the mass of a typical 50 ml glass beaker in grams
Sunday, September 21, 2008 at 12:31pm by al

UCI
Doing chem lab hw too huh? 1.60x 10^-5 M * 0.1 L / 1.54E-04 M = L convert to mL
Friday, April 9, 2010 at 12:17am by echem

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