April 24, 2014

Search: Chem.

Number of results: 5,866

chem- drbob222 please help
my original question was: how do i figure this out?? How much heat does your body lose when 2.46 g of sweat evaporates from your skin at 25C? chem - DrBob222, Tuesday, February 22, 2011 at 10:52pm q = mass water x delta Hvaporization. chem - Rebekah, Wednesday, February 23, ...
Wednesday, February 23, 2011 at 5:49pm by Rebekah

so i posted this question yesturday and got some help. which is the stuff below. can you look at the last thing i said which was the answer i got by doing what DrBob222 said to do and tell me if its correct.(the question is the first section) thanks chem - hannah, A salt ...
Wednesday, November 10, 2010 at 4:18pm by hannah

if a car produces 81g of {\rm CO_2}, how many grams of {\rm O_2} are used up in the reaction? the complete chem reaction is C2H6O+3O2--->2CO2+3H2O
Friday, October 19, 2012 at 8:20am by tracy

Chem Help!
I really need help with this question for my chem H.W. 1) On a summer day in Breckenridge, Colorado, the atmospheric pressure is 525 mm Hg. What is this air pressure in atmospheres? (round to the hundredths place) atm
Thursday, April 10, 2008 at 12:34pm by Lisa

Chem- bobpursley
What mass of protons would be required to just neutralize the charge of 1.5 g of electrons? my teacher said .0015kg times 1e-/.00091e-27kg times 1pt/1e- times 1.67262e-27 over 1 p chem - bobpursley, Tuesday, September 21, 2010 at 6:48pm That is what I would do also. But I ...
Tuesday, September 21, 2010 at 8:39pm by Sara

chem - br bob is this right
What is the pH of a solution prepared by adding 4.000 grams of NaOH to a 50.00 mL of a buffer that is 2.00 molar both in acetic acid and sodium acetate? (Assume final volume is still 50.00 mL) * chem - DrBob222, Wednesday, April 21, 2010 at 10:52pm * chem - phil, Wednesday, ...
Wednesday, April 21, 2010 at 11:05pm by phil

What causes dispersion forces? Disperson forces are caused by an unsymettrical distribution of charge in the molecule, causing a net electric force.
Tuesday, January 9, 2007 at 6:46am by Dennis

Gen Chem II
Thanks for the information Dr. Bob. Would you be able to work it out so that I can actually see the steps with the numbers and follow from there. The question was on Vitamin K from Sunday at 2:44pm which you answered at 3:45pm. Thanks again. I am looking to get a tutor since I...
Monday, February 11, 2013 at 5:28pm by Nefret

A secondary alcohol results from the attachment of a hydroxy group to which carbon atom? C | <---GIVEN STRUCTURE C1-C2-C3-C4 A) C1 B) C2 C)C3 D)C4 Answer is C! I have to explain why, but the teacher never taught us anything about organic chem. So please explain!
Friday, April 5, 2013 at 2:52pm by Anonymous

Dr.Bob222 Chem
I believe that you are correct because you have more experience in G-chem then I have. But how does doubling the reaction rate double the k value? Isn't k just a constant for a particular reaction?
Friday, February 1, 2013 at 10:15pm by Devron

Chem 1
Write a chemical equation that shows how acid rain H2SO3 was produced from SO2 gas and water in a zip sealed bag? My chem. teacher never explained how to do this and I have several other questions on this type of subject. If you could help me out it would help me tremendously...
Tuesday, April 9, 2013 at 8:00pm by Jess

physics vs. Chem
Doesnt physics seem to be harder than chem? Anyone?
Sunday, October 24, 2010 at 2:28pm by Kavi

Advice...about chemistry degree Dr.Bob
Based on the question topic posted by Britney below titled:In your opinion (your answer to this reminded me of something) (I posted the same thing there but I thought it was improper to piggyback on that post so I posted this under a new topic) I don't know where to start but ...
Tuesday, March 25, 2008 at 11:20pm by ~christina~

sand bath (chem)
what are disadvantages and advantages of using a sand bath to heat something in chem?
Sunday, October 21, 2007 at 7:31pm by ~christina~

What is another name for cardamist? Please write the formula and a link to its structure. See
Sunday, September 4, 2005 at 5:04pm by Nisar

Chem - DrBob222 & drwls
Just want to say thanks to you guys for the help you gave me during the last couple of months. It was all in preparation for the National Chemistry Test and I just received word I have been selected to be in the running for the National Chem Team. Thanks again.
Monday, October 8, 2007 at 12:12am by Vic

CHEM organic chem
i am really confused! i am doing the production of ethene from fractional distillation and i understand the whole concept of it what i don't get is how i can write a balanced eqn to show how ethene can be produced from C14H30 (tetradecane?!) i did C14H30 ------> C7H14 + ...
Tuesday, November 13, 2007 at 6:18pm by AllyKat

CHEM organic chem
i am really confused! i am doing the production of ethene from fractional distillation and i understand the whole concept of it what i don't get is how i can write a balanced eqn to show how ethene can be produced from C14H30 (tetradecane?!) i did C14H30 ------> C7H14 + ...
Tuesday, November 13, 2007 at 8:16pm by AllyKat

chem equations
could someone tell me how i could solve this chem equation CH4 + NH3 +O2...> HCN +H20 AND USE THE LOWEST WHOLE NUMBER COEFFICIENT i WOULD BE GRATEFUL FOR ANY POINTERS Try these coefficients. 2,2,3==>2,6 Hi bex heres a little more help for you. Answer is 2CH4+2NH3+3O2--&...
Sunday, May 6, 2007 at 12:00pm by bex

Are: Ba(NO3)2, Ti)2, MgI2, and Ca(CH3COO)2 soluble or insoluble in H2O @ 25degrees C? Here is a site that lists the solubility rules. You should know this table; eventually you will want to know it so well that it is memorized. If you still have questions after viewing this ...
Friday, October 20, 2006 at 1:41pm by K

chem help
im doing a graph for chem lab with excel. my classmate created a graph with these coordinates: X: 3.50 X10^-3 3.14X10^-3 3.28X10^-3 Y: -11.7 -8.96 -9.75 They got R2=0.998 but i got y = -3074.9x R = 0.6291 why is it wrong. im desperate please help! screen shot of my graph: ...
Saturday, October 23, 2010 at 11:05pm by ben

Ok, so in my gen chem 1 class, the teacher showed us that ethanol would not dissolve a sugar cube while water dissolves a sugar cube easily. No explanation was given, she just told us we would find out in gen chem 2. Here i am in gen chem 2, and the same thing is shown to us ...
Wednesday, August 31, 2011 at 11:09pm by Kevin

Please predict what will happen. Im not very good in chem. Iron metal and pb(NO3) Lead metal and Mg(9NO3)2 Copper metal and AL(NO3)3 Lead metal and AgNO3
Thursday, April 18, 2013 at 8:44pm by jim

A 10.0% by mass H2SO4(aq) solution has a density of 1.07 gcm-3. How many milliliters of solution contain 8.34 g of H2SO4? What mass (in grams) of H2SO4 is in 248 mL of solution? It's been a while since I have had a chem sorry if this seems really easy I just don't ...
Monday, February 15, 2010 at 2:37pm by Cairy

Calculate the expected volume of hot water that would be required to dissolve 0.15g of benzoic acid, vanillin, phthalic acid, salicyclic acid? You don't need to do all or any of them. I just need to know what formula to use and what to sub in and I can do the rest myself. I ...
Monday, May 25, 2009 at 1:05pm by Sam

I have a question concerning Spring Semester
Im a freshman in college and I just took Chem1, Trig, and Drama (12units). I am planning on taking Chem2, Pre-Calc, and Art1 for spring sem. (13units). I'm not sure if this is too much to take for next semester considering two five unit classes or should I add another class? ...
Thursday, December 22, 2011 at 8:53pm by L.Bianchessi

Gen Chem
For my chem class I have 3 elements and have to find what they are used for today or an interesting fact. I have looked but I can't really fin anything. My elements are: Cobalt,Thulium, and Roentgenium I found that cobalt is used in money (nickels, quarters, and dimes, but ...
Sunday, October 21, 2012 at 12:20pm by Andrea

High school AP chem
The solubility of Mn(OH)2 is 3.04 x 10^-4 gram per 100 ml of solution . A) write the balanced chem equation for Mn(OH)2 in aqueous solution B) calculate the molar solubility of Mn(OH)2 at 25 degrees celcius C) calculate the value of the solubility product constant, Ksp, for Mn...
Tuesday, April 1, 2014 at 1:52pm by Chem review question

The solubility of Mn(OH)2 is 3.04 x 10^-4 gram per 100 ml of solution . A) write the balanced chem equation for Mn(OH)2 in aqueous solution B) calculate the molar solubility of Mn(OH)2 at 25 degrees celcius C) calculate the value of the solubility product constant, Ksp, for Mn...
Tuesday, April 1, 2014 at 11:33am by Bee

I have finals coming up in a week and a half. I know I should have started studying earlier, but I just had an exam in my chem class and was focused on getting the information for that exam mastered before I started studying for the final. Now, I'm overwhelmed. I have no idea ...
Monday, November 30, 2009 at 7:16pm by Katherine

General Chem
So for Chem we have to answer a question asking why graphing is a more accurate method for measuring density than manually calculating the density. I originally thought that manually calculating was better, but my teacher told me that I would have to back that up with a lot of...
Sunday, September 22, 2013 at 1:33pm by Anonymous

drying agent in chem
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 I'm not sure I believe him. He sounded unsure of himself when he answered me. solution: methylene chloride (extracting oil of caraway) drying agent...
Saturday, October 27, 2007 at 4:11pm by ~christina~

Ionic bonds and covalent bonds, which one is the stronger. My present teacher said that covalent bond is the strongest one. I learned ionic interaction is the strongest and many chem. books say so. Now i am confused. Is my present teacher right. Please explain this for me, and...
Tuesday, October 5, 2010 at 9:35pm by bun

chem HELP PLEASE its physics side of chem
given E, = l^2 h^2 / 2 m r^2 calculate energies for an electron localised to a circle of radius 2 x 10^-9 m for l = 0,1,2, draw pictures of three levels and calculate the relative populations of these levels at 300K i did the first bit but came out with, 0, 6.0249 x 10-6 J mol...
Tuesday, October 27, 2009 at 4:51pm by poppy

chem-> front page report
wondering if this looks good or should I make the format some other way. Multistep Synthesis of 4-Bromo-2-Chloro-6-Iodoaniline name school Chem###sec## Multistep A,B March 13,2008 Multistep C March 20,2008 Multistep D March 27, 2008 Multistep E April 03, 2008 not sure if I ...
Monday, April 7, 2008 at 11:29pm by ~christina~

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...
Sunday, April 17, 2011 at 8:53pm by please, help me

CHEM (DrBob222)
I had posted the question to that previous chem question, regarding Mo & V...they said that it should have been correct. What I am thinking that I was missing...must have been that I did not include 4s & then just not fill it. I had excluded it from my electron filling ...
Monday, November 26, 2007 at 12:10am by K

Are propane, methoxymethane, and ethanol soluble in water? yes Henry is wrong.
Monday, June 11, 2007 at 10:21pm by Raj

Why must a calculated answear generally be rounded? and how many siginificant figures must you round an answear to when performing multiplication or division?
Thursday, January 11, 2007 at 8:30pm by Dennis

The correction terms in the Van der Waals equation for a gas are designed to correct A. the pressure term (P +a/V2) for the attractive forces between particles. B. the volume term (V-b) for the finite volume of the particles. C. For the volume term (b) not the pressure term (a...
Wednesday, October 18, 2006 at 7:23pm by Mendi

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

What is the structural formulae for the equation for the hydrolysis of lactose? It is impossible for us to draw structures on the computer. Here is a web site that may help you.
Saturday, February 10, 2007 at 4:49pm by Samantha

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 ...
Monday, February 19, 2007 at 2:39pm by jules

Sunday, November 18, 2012 at 8:59am by Anonymous


Thursday, February 27, 2014 at 1:04pm by lovetavolmar

Concerning TLC plates... 1. why should't I allow the solvent to reach the top of the plate? (I assume it's the same as using paper like I did in gen chem but I'm not sure I know why it shouldn't be allowed to reach the top... what would happen?) 2. why sholdn't the spot sample...
Thursday, September 27, 2007 at 10:49pm by ~christina~

what is the % of CI in CCl4?
Tuesday, September 4, 2007 at 5:18pm by sty

Sunday, April 6, 2008 at 2:38am by ~christina~

H2 + H2O ->??
Tuesday, April 15, 2008 at 12:31am by David

what does S.T.P mean?
Wednesday, March 4, 2009 at 2:41am by tegz

i need help
Wednesday, April 7, 2010 at 8:59pm by amy

What is the pH of 0.2 M HN3?
Sunday, October 31, 2010 at 12:24am by d

which of the following could not be reduced to a simpler piece of matter? compound, solution, element, mechanical mixture? Your exact answer is at the following site:
Wednesday, June 21, 2006 at 12:33am by jenna

another chem question
Examine the following unbalanced chemical equation: CO(little2) + C --> CO Which of the following is the correctly balanced form of this equation? 2CO(little2) + C --> CO CO(little2) + C -->2CO CO(little2) + C(little2) --> CO CO(little2) + C -->C(little2)O ...
Friday, August 5, 2005 at 7:38pm by alf

is 3.00 x 10^8 m/s the speed of light
Thursday, November 1, 2007 at 9:03pm by Lauren

What is the name for H3CF?
Wednesday, November 14, 2007 at 8:57pm by Anonymous

Is BrCl3 octahedral?
Thursday, November 15, 2007 at 10:29pm by Anonymous

How many stereoisomers are there for 1,2-dichlorocyclopentane
Sunday, February 24, 2008 at 9:41pm by Lynsey

is ethanol chiral?
Friday, April 25, 2008 at 11:04pm by Ginger

What is the PaO2 of H2O
Sunday, November 23, 2008 at 3:42pm by Bubba

NaNO3 + H2O >
Friday, October 9, 2009 at 6:43pm by zenda

How any orbits 4p subshell?
Tuesday, March 9, 2010 at 8:24pm by Patti

What is the PH of 0.0100M H2SO4?
Thursday, April 1, 2010 at 4:06am by CC

How many electrons are in an atom of O2-.
Sunday, September 5, 2010 at 6:11pm by vanessa

what is(2.25x10*3)(4.80x10*4)=
Tuesday, September 14, 2010 at 6:17pm by mark

The ka expression for HTe- is?
Sunday, November 28, 2010 at 8:58pm by IH

What is the [OH-] for a solution at 25C that has [H3O+] = 8.23 10-2 M?
Saturday, March 5, 2011 at 4:51pm by richard

why is hexane known as hydrocarbon?
Wednesday, July 20, 2011 at 2:48am by jo

Honors Chem B
Thank you bobpursley!
Thursday, September 1, 2011 at 9:23pm by Deahna

chem 1010
Thank you for your help Dr.Bob
Saturday, November 19, 2011 at 3:28pm by maryclare

formula for bipyridyl
Wednesday, March 7, 2012 at 2:27pm by HELP PLEASE

What is the formula to calculate qp?
Thursday, July 12, 2012 at 2:54am by lani

What is the PH of 0.40 M Na2SO3? (K1 for H2SO3 = 1.5 * 10^-2; K2 = 1.0 * 10^-7
Thursday, August 2, 2012 at 9:16pm by XIA

Al(CN)3.8H2O What is it named?
Tuesday, October 30, 2012 at 1:11pm by Anonymous

What is the pH of a 0.22 M solution of HClO4?
Thursday, December 6, 2012 at 2:09pm by val

Monday, March 3, 2014 at 8:52pm by Brianna

Does anybody know any websites that there are chemistry labs that could possibly be used in a CSI investigation? I cant find anything.
Saturday, February 24, 2007 at 5:32pm by Ron

What is the equation of the hydrolysis of lactose?
Sunday, April 8, 2007 at 2:23pm by laura

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~

Biology (Science)
Why is water a polar molecule? Please read: (Broken Link Removed) AND
Monday, September 25, 2006 at 6:46pm by Dakota

Something with L-carvone or D-carbon?
Thursday, February 1, 2007 at 10:28pm by mily

what is a distribution coefficent?
Saturday, September 8, 2007 at 10:59pm by ~christina~

NaOH (aq) + Zn (solid) reaction
Monday, November 12, 2007 at 12:32am by John

What is molar mass of CaSO4?
Tuesday, November 13, 2007 at 5:29am by Ryan

How many atoms are in 1.75 mol CHCl3?
Tuesday, November 13, 2007 at 5:31am by Ryan

how do I find the H for C2H4 + O3 --> CH3CHO + O2?
Tuesday, November 20, 2007 at 5:38pm by mel

Sunday, January 6, 2008 at 2:11pm by Courtney

How does the crystallization process occur??
Monday, January 14, 2008 at 9:00pm by Amanda

how do u put this in scientific notation 3x 10^3 +4.0 x 10^4
Monday, February 11, 2008 at 9:39pm by john

how to draw the structure of AlHAtCl_2-?/
Tuesday, March 11, 2008 at 1:10am by anis

method of producing aspirin
Thursday, March 13, 2008 at 9:48am by dc

Why are complex ions of Zn+2 colorless?
Saturday, April 19, 2008 at 3:30pm by Ginger

how do you determine the theoretical yield?
Monday, April 28, 2008 at 3:45pm by Kayla

assign oxidation numbers to PF-6(aq)
Sunday, May 11, 2008 at 10:37pm by amethyst

how do you convert grams to moles
Thursday, May 29, 2008 at 10:40pm by amie

ionic compounds are composed of
Monday, June 2, 2008 at 3:37pm by josh

what are 3 types of gene munitions?
Tuesday, June 3, 2008 at 7:25pm by Anonymous

Easy Chem 2
17) How many moles of NO2 are in 2.3g
Wednesday, July 2, 2008 at 1:08pm by ScienceKid

What is the balanced equation for ethane?
Monday, September 29, 2008 at 8:27pm by Elena

what is a lighted wooden splinter?
Thursday, October 2, 2008 at 6:45pm by Anonymous

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