Questions and answers by

~christina~

Questions (167)

I have a question about m-Phenylenediamine.Is m-Phenylenediamine the same as m-Phenylenediamine hydrochloride? I apparently have
1. 2 answers
2. 437 views
I'm know I'm interested in the chemistry field. The problem is that I have to further narrow down my field of interest.I was
1. 10 answers
2. 1,276 views
How would I cite a document from the UNEP website? (PDF document)APA style? I've been looking but it looks like you have to cite
1. 4 answers
2. 2,153 views
I have a question about compounds that oil out of solvents after drying.How would I analyze this? Could I make a KBr pellet, or
1. 2 answers
2. 639 views
I have a general problem with not being able to determine when it is appropriate to use semicolons.I usually use appostrophes
1. 2 answers
2. 454 views
I have a question about TLC plate solvents. What solvents will leave stains on a plate with a TLC plate out of the ones below
1. 7 answers
2. 838 views
solvent layer: 1solid precipitate: no I ran the solvent layer I got in my unknown in the GC and I had sharp peaks in the
1. 7 answers
2. 1,383 views
When performing vacuum filtration of a solid in an unknown solvent, is it necessary to go and find out the solvent composition,
1. 2 answers
2. 1,400 views
I have a question about solvent evaporation. If I had an organic layer and an aqueous layer in an unknown mixture of liquids and
1. 4 answers
2. 1,348 views
How would I compare using peak heights vs peak areas for GC quantitation?Thanks
1. 2 answers
2. 453 views
Sorry, I didn't see this.Actually you have only one mixture; it happens to have two components. There is a more or less
1. 0 answers
2. 565 views
If I had two unknown chemicals (in solid form) mixed together, how could I go about identifying the individual components of the
1. 4 answers
2. 668 views
If I have a graph of concentration in Absorbance at 400nm vs [micromolar]of para-nitrophenolThe slope would be the extinction
1. 0 answers
2. 871 views
What would it mean if the line of a linear regression graph went through the origin?If it doesn't go through the origin and I
1. 1 answer
2. 754 views
The only reason I asked about the balance is that most analytical balances in use in schools weigh to the nearest 0.1 mg
1. 2 answers
2. 594 views
I'm making different concentrations ofethanol and I just wanted to check my calculations and method. Making ethanol
1. 5 answers
2. 934 views
The pKa of HEPES is 7.55 at 20C and it's MW is 238.31. Calculate the amounts of HEPES in grams and of 1.0M NaOH in ml that would
1. 3 answers
2. 1,048 views
I'm doing an experiment and I'm supposed to have neutral basic and acid samples of solution.I just wanted to make sure that I
1. 2 answers
2. 1,208 views
I'm doing an experiment and I'm supposed to have neutral basic and acid samples of solution.I just wanted to make sure that I
1. 1 answer
2. 542 views
I was wondering how does one make a saturated chemical solution?I'm supposed to make one, is there a way I can determine the
1. 2 answers
2. 642 views
I need help finding information on how the conway microdiffusion is done/how it works. And why the sample is titrated.Thank you
1. 0 answers
2. 537 views
I need help finding information on how the conway microdiffusion is done/how it works. And why the sample is titrated.Thank you
1. 1 answer
2. 503 views
UVI was just wondering how a solvent would affect the spectra of a compound. Like a polar or nonpolar solvent for example:
1. 3 answers
2. 821 views
I was just wondering if it was necessary to remember each branch of chemistry learned.I can't really remember general chemistry
1. 4 answers
2. 822 views
can someone give me a site that tells me the order of the courts in a state?I don't want to say the state but if needed I will
1. 2 answers
2. 741 views
how can this person say that I googled info? (I created it randomly out of my head) and be so ungrateful that I spent the
1. 3 answers
2. 903 views
Commercial hydrazine is sold as a 64% solution. Using that as your starting material, how would you prepare a 5% solution of
1. 4 answers
2. 804 views
Commercial hydrazine is sold as a 64% solution. Using that as your starting material, how would you prepare a 5% solution of
1. 3 answers
2. 730 views
hm..I was wonderingIf someone (cough* me) makes mistakes in answering questions, should they bother answering anything at all?
1. 6 answers
2. 744 views
not understanding how to do this.A certain storm cloud has a potential of 1.00x10^8 V relative to the tree. If during a
1. 0 answers
2. 561 views
(100)d^2-(57.3)d= 0solve for d. yes...I just can't figure out what number I'd use to factor this and it got bumped to the next
1. 3 answers
2. 520 views
100N/m d^2 - 57.3d= 0sigh...I can't figure out how to find d know it's factoring but as to actual number to factor out...not so
1. 1 answer
2. 420 views
Can someone tell me if this objective for my lab report sounds alright?The objective of this multistep lab was to ultimately
1. 3 answers
2. 863 views
My lab teacher told me to leave my sample mixture of 2-bromobutane and 2-chlorobutane in a solution 1-2ml of sodium bicarbonate.
1. 0 answers
2. 651 views
I have a question about distillation.Or heating in general. When something says heat for 1hr or 1/2 hr do you start counting
1. 5 answers
2. 715 views
I was wondering if I'm synthesizing a product in the end. I shouldn't put the end product of each reaction on the front page as
1. 3 answers
2. 457 views
wondering if this looks good or should I make the format some other way.Multistep Synthesis of
1. 5 answers
2. 867 views
Ka/Kb for the acetanilidebeing told that on the basis of this it will tell me whether a nitrogen or oxygen are protonated...
1. 1 answer
2. 397 views
NaClO3 + H2O + HCl=>what form is the Cl in ? I know that a gas is formed but the reaction that I did also had Cl reacting with
1. 2 answers
2. 730 views
Br + CHCOOH
1. 3 answers
2. 383 views
I was thinking about how clubs get started in college in the first place. For example there is a club for different
1. 8 answers
2. 1,279 views
book says:(4-4.00x + x^2)(6.00x10^-6C)= x^2(15.0x10^-6C) they got: 3.00x^2+ 8.00x-8= 0 I don't get how they got
1. 4 answers
2. 659 views
Posted by ~christina~ on Sunday, March 30, 2008 at 9:14am.Two small silver spheres with a mass of 10.0g, are separated by 1.00m.
1. 8 answers
2. 651 views
4 charged particles are at the cornedrs of a square of side a as shown.a) determine the magnitude and direction of the electric
1. 3 answers
2. 925 views
Two small silver spheres with a mass of 10.0g, are separated by 1.00m. Calcuate the fraction of the electrons in one sphere that
1. 1 answer
2. 1,097 views
What would cause the peaks in a IR analysis to be smaller than they should be? My sample had the right peaks where they should
1. 6 answers
2. 580 views
Sorry but I have just a few more Q'sfrom what you said And something that I saw today.Actually I was talking about specific
1. 2 answers
2. 544 views
I replied to that post from yesterday. I don't know if you saw it.
1. 8 answers
2. 736 views
During the compression stroke of a certain gasoline engine, the pressure increases from 1.00atm to 20.0atm.If the process is
1. 2 answers
2. 713 views
A house has well insulated walls. It contains a vol of 100m^3 of air at 300Ka) calculate the E required to increase the T of the
1. 6 answers
2. 1,406 views
Based on the question topic posted by Britney below titled:In your opinion(your answer to this reminded me of something) (I
1. 2 answers
2. 851 views
welcome back =)and happy easter too.
1. 1 answer
2. 429 views
Poem"for rosa parks" And how was this soft-voiced woman to know that this was "No" in answer to the command to rise would signal
1. 9 answers
2. 3,607 views
I helped the best I could on your organic chem question
1. 2 answers
2. 428 views
It's a simple problem I think but I can't get the answers to match with the book.A particle fingering flute sounds note with
1. 2 answers
2. 651 views
For 1 part of the lab I:prepare 4-Bromo-2-chloro-6-iodoaniline I dissolve 250mg recrystallized 4-
1. 5 answers
2. 1,137 views
Yes...another calculation problem.Rxn: 1ml isopentyl alcohol + 1.5ml glacial acetic acid + 3 drops sulfuric acid=> isopentyl
1. 3 answers
2. 1,110 views
I'm trying to post this again..(assuming you didn't see the one below)I posted a question yesterday. I was hoping to catch you
1. 1 answer
2. 582 views
I posted a question yesterday.I was hoping to catch you before you left on your getaway. =D
1. 0 answers
2. 505 views
Yes...another calculation problem.Rxn: 1ml isopentyl alcohol + 1.5ml glacial acetic acid + 3 drops sulfuric acid=> isopentyl
1. 1 answer
2. 713 views
I was looking at a few videos online.If you type in "top ten amazing chemistry videos" into google and click the first link
1. 2 answers
2. 700 views
I have a question. I'm forming Isopentyl acetate by the esterfication of acetic acid with isopentyl alcohol.The rxn is shifted
1. 7 answers
2. 934 views
I need help seeing if my thoughts are correct and how to do some things.Block 1 of mass 0.200 kg is sliding to the right
1. 4 answers
2. 799 views
I'm proposed a way I'd synthesize plastic...polyethylene to shape into a pipePROBLEM: not sure how or what I would use to make a
1. 1 answer
2. 717 views
A 2.00kg object attatched to a spring moves without friction and is driven by an external force given byF= (3.00N)sin(2pi*t) The
1. 3 answers
2. 1,086 views
The speed of sound in air (m/s) depends on temperature according to aprox expression ofv= 331.5 + 0.607 Tc Tc= temp in celcius
1. 8 answers
2. 5,294 views
A 2.00kg block hangs from a rubber cord, being supported so that the cord is not stretched.The unstretched length of the
1. 8 answers
2. 1,546 views
My hwk Q that I was trying to find the answer to yesterday is this below but I don't know exactly how the placticizing process
1. 0 answers
2. 585 views
new in bold(copied in normal text) 0.5g hex (1mol/116.21g)= 0.004302mol hex 0.5g adi (1mol/183.03g)= 0.002731mol adi
1. 4 answers
2. 733 views
could you check the next page where I replied to the post from yesterday pertaining to nylon calculations.Thanks C
1. 5 answers
2. 503 views
I synthesized Nylon in my lab for organic chem.I need help figuring out the theoretical yield so I can compare it to my product
1. 6 answers
2. 4,907 views
Hi =)I have two Q's 1. What are the 2 purposes of using a caffine standard during the HPLC process? In general not
1. 0 answers
2. 496 views
A person can lift 45 kg ( aprox 100lb). Using specific gravity as 10.17How many cubic meters of the metal could the person lift
1. 4 answers
2. 2,158 views
In calculating the density of a heavy solid. The string holding the heavy solid will cause error.specific gravity= (mass object
1. 0 answers
2. 694 views
NH4ClIs it N surrounded by 4 H's and then the Cl is connected to a H?? Technically I think that couldn't happen so how would
1. 2 answers
2. 527 views
I have to know the spin of a electron and what I have in my notes has me confused.1. If the # of neutrons and # protons of a
1. 7 answers
2. 735 views
A car of mass Mc is connected to mass m2 by a string. The string passes over a solid cylindrical pulley, which has a
1. 2 answers
2. 668 views
Why is it that in particular experiments they say to use a Hirsch funnel while we have both the Hirch funnel and the buchner
1. 2 answers
2. 748 views
I'm going to do the Baeyer test (Pottasium permanganate)Instructions say to disslove 25mg of unknown or 2 drops of liquid
1. 2 answers
2. 585 views
I did a dehydration rxn with 1.424g of 4-methylcyclohexanol with .40ml 85% H3PO4 and 6 drops of concentrated H2SO4.I have to
1. 3 answers
2. 1,162 views
Thanksgiving: this occured.Ham was being served at the dinner. The ham was marinaded with lemonade. This is served every year
1. 2 answers
2. 650 views
I had to go and do a oxidation- reduction lab where:I went oxidized borneol with sodium chloride and added 0.360g racemic
1. 6 answers
2. 1,464 views
The coordinate of a 2.00kg object in linear motion is described by the function:x(t)= (2.00m/s^3)t^3 -(7.00m/s^2)t^2 +
1. 6 answers
2. 729 views
How would I make a 5% solution of sodium bisulfite?sodium bisulfite: NaHSO3 Molar mass: 104.06 g/mol is it 5% w/w or v/v or w/v
1. 8 answers
2. 1,511 views
How do I analyze a HPLC result?The lab tech injected the sample into the machine and I have the result paper for the sample
1. 0 answers
2. 555 views
Is it advisable or not to leave a solution in drying agent for a few days?~I did this ..since my chem lab instructor said to but
1. 1 answer
2. 507 views
what are disadvantages and advantages of using a sand bath to heat something in chem?
1. 2 answers
2. 2,330 views
2 blocks are connected by a rope of negligible mass are being dragged by a horizontal force. Suppose F= 68.0N, m1= 12.0kg, m2=
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2. 1,405 views
consider a sample that is a mixture of biphenyl, benzoic acid, and benzyl alchohol. The sample is spotted on a TLC plate and
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2. 1,410 views
consider a sample that is a mixture of biphenyl, benzoic acid, and benzyl alchohol. The sample is spotted on a TLC plate and
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2. 713 views
[b]1.[/b]Is TLC a qualitative or quantitative analysis? Is there any way that it can be both? Explain.~I say it can be both
1. 1 answer
2. 940 views
hexaneacetone water methanol -order from most to least polar... ~water/methanol, acetone, and hexane.. I can't decide which
1. 1 answer
2. 780 views
Describe the concept of polarity.How is polrity related to electronegativity? ~Well I think that polarity is how I remember
1. 2 answers
2. 921 views
Consider the following errors that could be made when running the TLC. Indicate what should be done to correct the error.a) A 2
1. 1 answer
2. 741 views
I was told before that it takes 2 mol of fluorene to be reduced by 1mol of sodium borohydride....How many mg of fluorenone can
1. 2 answers
2. 651 views
For the reaction:acetic acid (2g) + Isopentyl alcohol (0.9g) => Isopently acetate(1.15g)+ H2O I'm suposed to determine the
1. 2 answers
2. 1,269 views
How many mg of fluorenone can 0.53mol of sodium borohyride(NaBH4) reduce?~I don't know how to get this..wouldn't I have to have
1. 2 answers
2. 526 views
I have to find the magnitude and direction of a resultant vector from values obtained from a vector table.The values in the book
1. 0 answers
2. 1,130 views
what is this? (Fluorenol)I can't find it in th Merck Index or online... I'm going to be using it in organic chem and I can't
1. 3 answers
2. 849 views
I was making some instant coffee and it had clumped up...I was heating up some water to go and make coffee...Then I just looked
1. 3 answers
2. 1,044 views