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April 16, 2014

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Number of results: 222

life science
Thank you for using the Jiskha Homework Help Forum. Please visit the next 2 sites: 1. http://www.elmhurst.edu/~chm/vchembook/601glycolysisrx.html 2. (part II of #1): http://www.elmhurst.edu/~chm/vchembook/601glycolysissum.html Sra
Sunday, November 23, 2008 at 10:18am by SraJMcGin

Chemistry
the components/elements of a mixture can be physically separated http://www.elmhurst.edu/~chm/vchembook/106Amixture.html
Thursday, February 10, 2011 at 11:58pm by TutorCat

advanced biology
chemical properties describe how a _____ changes into a new substance. This site will give you a definition and examples. http://www.elmhurst.edu/~chm/vchembook/105Achemprop.html
Sunday, August 19, 2007 at 3:06pm by emily

science
You don't really need calculations to answer this. A discussion of the role of soap/detergents in dissolving (nonpolar) oil in (polar) water can be found at http://www.elmhurst.edu/~chm/vchembook/554soap.html
Friday, January 16, 2009 at 12:48pm by drwls

college chemistry
This should get you started since both A and B are hydrocarbons. C is an alcohol and will exhibit hydrogen bonding; therefore, it will boil higher than either A or C. http://www.elmhurst.edu/~chm/vchembook/501hcboilingpts.html
Thursday, November 11, 2010 at 10:54pm by DrBob222

Chem
Convert the path length to cm. Plug in Beer's law equation and solve for c. A = ε l c http://www.chm.davidson.edu/vce/spectrophotometry/beerslaw.html
Friday, November 9, 2012 at 11:17am by TutorCat

science
what is carbon cycling http://www.elmhurst.edu/~chm/vchembook/306carbon.html A thing made out of carbon. It is in a shape like a circle
Tuesday, June 14, 2005 at 7:40pm by Josh

science
Thank you for using the Jiskha Homework Help Forum. Look at the following: http://www.elmhurst.edu/~chm/vchembook/106Amixture.html White vinegar, for example, is homogeneous. Oil and vinegar would be heterogeneous . Sra
Wednesday, September 17, 2008 at 2:07pm by SraJMcGin

science
http://www.elmhurst.edu/~chm/vchembook/184ph.html
Monday, March 12, 2012 at 3:56pm by Ms. Sue

chemistry
http://www.elmhurst.edu/~chm/vchembook/184ph.html
Tuesday, May 29, 2012 at 10:11pm by Ms. Sue

CHM 152
At 20oC, a 2.32 M aqueous solution of Ammonium Chloride has a density of 1.0344g/ml. WHat is the molality of Ammonium Chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol?? I am not sure how to incorporate the density into the problem to come up with how to ...
Thursday, June 10, 2010 at 9:47pm by Car

science
http://www.elmhurst.edu/~chm/vchembook/260acidbasebal.html
Thursday, May 8, 2008 at 11:21pm by DrBob222

chemistry
http://www.elmhurst.edu/~chm/vchembook/327aluminum.html
Wednesday, March 10, 2010 at 1:41pm by DrBob222

central
http://www.elmhurst.edu/~chm/vchembook/143Aioniccpds.html
Friday, June 10, 2011 at 1:54pm by TutorCat

chemistry
Here is your answer. http://www.chm.davidson.edu/vce/kinetics/integratedratelaws.html
Wednesday, April 6, 2011 at 1:57pm by DrBob222

density of Magnesium!
Is your volume formula consistent with the hexagonal close packed crystal structure? That might be the cause of your disagreement. See http://www.chm.davidson.edu/ChemistryApplets/Crystals/UnitCells/hcp.html
Friday, February 6, 2009 at 7:34pm by drwls

Chemistry Bonding
We generally call those compounds with an electronegativity difference of 1.8 or greater ionic. The difference here is about 1.22 which means a polar covalent bond. http://www.chm.davidson.edu/ronutt/che115/electroneg.htm
Wednesday, June 2, 2010 at 3:57am by DrBob222

chemistry
Bauxite is the ore. Aluminum oxide (alumina) is the intermediate. Here is a good diagram with labels. Better than I can draw. http://www.elmhurst.edu/~chm/onlcourse/chm110/outlines/aluminum.html
Thursday, September 29, 2011 at 2:44pm by DrBob222

Chemistry
http://www.chm.davidson.edu/ChemistryApplets/Crystals/NetworkSolids.html
Saturday, December 13, 2008 at 3:53pm by DrBob222

Chemistry
http://www.chm.davidson.edu/vce/kinetics/IntegratedRateLaws.html
Saturday, November 14, 2009 at 8:04pm by DrBob222

Organic Chem
According to the problem, the rate constant, k, has units of M/s which is moles/L*s and that is for a zero order equation. The equation then is r = k and the concns don't enter into the equation at all. You can read more about it here. http://www.chm.davidson.edu/vce/kinetics/...
Wednesday, November 9, 2011 at 2:50am by DrBob222

earth
http://www.elmhurst.edu/~chm/onlcourse/chm110/outlines/nitrogencycle.html
Sunday, November 11, 2012 at 7:20pm by Ms. Sue

Chemistry
Have you omitted part of the problem? If you are referring to "this" compound as the new compound, I would think pentane. If you are referring to the original compound, you haven't provided enough information. http://www.elmhurst.edu/~chm/vchembook/501hcboilingpts.html I would...
Monday, March 14, 2011 at 10:20pm by DrBob222

Chem
Have you seen this. It is a site that essentially does what you have described for you. http://www.chm.davidson.edu/ronutt/che115/Zeff/Zeff.htm
Friday, November 7, 2008 at 12:27pm by DrBob222

biology
This site has a good explanation: http://www.chm.bris.ac.uk/webprojects2002/anderson/disappearing_egg_shell.htm
Saturday, October 24, 2009 at 12:50pm by GuruBlue

science
There are many sources online written at various grade levels. Perhaps this one will help: http://www.elmhurst.edu/~chm/onlcourse/chm110/outlines/nitrogencycle.html I recommend reading several that you easily find by using the search words "nitrogen cycle" . You will probably ...
Sunday, November 11, 2012 at 9:46pm by drwls

CHEMISTRY
One of the assumptions made in the Kinetic Molecular Theory is that the molecules have zero volume. Neglecting the volume term (and it is small) allows to to work with a much simpler equation in the general gas law of PV = nRT. There are other assumptions, too. You can read ...
Tuesday, May 18, 2010 at 3:13pm by DrBob222

Chemistry
I said in my response that LiCl and BaCl2 were ionic AND I said they were solids. Those two will be ionic solids. CCl4, NCl3 and BCl3 are covalent. http://www.chm.davidson.edu/ChemistryApplets/Crystals/NetworkSolids.html My best guess is that those three are molecular when ...
Monday, February 4, 2008 at 11:56am by DrBob222

chm
yes thank you!!!!
Friday, October 10, 2008 at 6:40pm by sarah

chm 2
Yes, that will do it.
Monday, October 14, 2013 at 11:39pm by DrBob222

chemistry
hi, I am wondering if benzyl acetate is polar or nonpolar? because it has a non polar benzene ring but also it has the ester bit attached so i am confused. Also i cant seem to understand the vander waal forces that are in it. if anybody could help that would be super A little ...
Monday, December 18, 2006 at 11:19pm by steff

organic chemistry
http://www.harpercollege.edu/tm-ps/chm/100/dgodambe/thedisk/labtech/sepfun2.htm
Friday, June 10, 2011 at 11:14am by TutorCat

chm
That answer is not right.
Friday, October 10, 2008 at 6:40pm by Corey

chm
See avove.
Tuesday, October 27, 2009 at 12:45am by DrBob222

ChM
PV=nRT
Saturday, July 6, 2013 at 4:14pm by bobpursley

CHM
See your post above.
Monday, November 19, 2012 at 6:49pm by DrBob222

CHM
The correct answer is "none of these".
Sunday, January 27, 2013 at 11:29pm by DrBob222

chm
Go to the head of the class.
Monday, February 18, 2013 at 10:26pm by DrBob222

CHM 152
I get 0 as the answer but not sure if I am right
Friday, March 26, 2010 at 1:50pm by AMI

CHM 152
I am nit sure where to start.
Tuesday, June 8, 2010 at 9:15pm by Car

CHM 152
Thanks I got it and yep it is correct.
Tuesday, June 8, 2010 at 9:15pm by Car

CHM 152
Don't you use the Arrhenius equation?
Thursday, June 10, 2010 at 9:40pm by DrBob222

chm
Use the Henderson-Hasselbalch equation.
Sunday, June 27, 2010 at 12:58pm by DrBob222

chm
What is 1.8&10^21 * (1.076/100)?
Tuesday, August 31, 2010 at 10:02pm by MathMate

chm
The noble gas one is correct
Wednesday, February 20, 2013 at 11:48pm by Jammyy

CHM
(P1V1/T1) = (P2V2/T2)
Saturday, July 6, 2013 at 4:12pm by DrBob222

Gen Chm 2
See your other post.
Thursday, October 17, 2013 at 1:10am by DrBob222

chemistry
Here is a link that lists melting points and boiling points for a number of hydrocarbons. Those with boiling points less than about 20 degrees C are gases, those with melting points above about 20 degrees C are solids http://www.elmhurst.edu/~chm/vchembook/501hcboilingpts.html
Monday, December 31, 2007 at 11:29am by DrBob222

CHM 157
calculate the lattice energy of CaO
Tuesday, April 8, 2008 at 10:59pm by Anonymous

CHM
Surely you jest. Concentrations are not measured in atm.
Sunday, March 28, 2010 at 2:04pm by DrBob222

chemistry
CHM 1045, huh?? I'd like to know too!
Wednesday, September 29, 2010 at 6:45pm by FIU Kid

chm
determing concentration by spectroscopy lab discussion?
Monday, April 4, 2011 at 11:22pm by iqra

CHM
2Na + 2H2O ==> 2NaOH + H2
Tuesday, November 27, 2012 at 7:03pm by DrBob222

CHM
I thought those two are also chemical?
Sunday, January 27, 2013 at 11:29pm by jakey

chm
I need to find the mass of 0.0225 mole of NH3?
Wednesday, September 29, 2010 at 4:20am by cindy

chm
You should proof your posts. You've omitted all of the "whats".
Thursday, February 9, 2012 at 7:39pm by DrBob222

CHM
How to balance the following equation: Na(s) + H2O(l) yields?
Tuesday, November 27, 2012 at 7:03pm by Adam

chm
yes. 1s2 2s2 2p6 3s2 3p4 is S neutral.
Monday, February 18, 2013 at 10:31pm by DrBob222

CHM
Ba(OH)2 + P4O10 → Ba3(PO4)2 + H2O
Wednesday, October 10, 2012 at 10:24pm by Anonymous

chm
The molar solubility of PbBr2 at 250C is 1.0x10^-2. Calculate the Ksp.
Sunday, June 27, 2010 at 1:10pm by ami

biology
.elmhurst.edu/~chm/vchembook/5900verviewmet.html on June 6, 2011.
Sunday, December 16, 2007 at 10:36pm by Anonymous

chm
one mole weighs 14+3 = 17 grams = 0.017 kg
Wednesday, September 29, 2010 at 4:20am by Damon

chm
How many valence shell electrons would you expect for an S2- ion? 8 Am I correct.
Monday, February 18, 2013 at 10:31pm by luck

chm
It stays at constant 100 deg C as long as it is and ice/water mixture.
Sunday, March 3, 2013 at 2:10am by Damon

CHM 152
Set up an ICE chart and solve. Post your work if you get stuck.
Friday, March 26, 2010 at 1:51pm by DrBob222

CHM 152
You didn't type all of the problem. Analysis shows that 1 mole of (WHAT) is present at equilibrium.
Friday, March 26, 2010 at 1:50pm by DrBob222

CHM
How might chromophores, auxochromes, and solubilizing groups be responsible for the position of dyes on a chromatogram?
Tuesday, November 13, 2012 at 3:50pm by Jerett

CHM
In the chemical formula of ammonium sulfate, (NH4)2SO4, how many hydrogen atoms are present? 4
Sunday, January 27, 2013 at 11:46pm by jakey

CHM
Br2 is a liquid at room temperature. So I would say it occupied 250 L at STP.
Sunday, March 17, 2013 at 11:13pm by DrBob222

ChM
Calculate the pressure exerted by 1.2 mol of gas in a volume of 28.2 L and at a temperature of 61 C.
Saturday, July 6, 2013 at 4:14pm by Anonymous

chm
If 0.0490g of AgIO3 DISOLVES per liter of solution, calculate the solubility product constant.
Sunday, June 27, 2010 at 1:13pm by ami

chm
The same process as AgIO3 but you need to set up an ICE chart for it to make it clear.
Sunday, June 27, 2010 at 1:10pm by DrBob222

chem
I think either solvent will separate the two compounds; however, the diethyl ether separation will be farther apart and I would pick that one. As for hexane being more polar than diethyl ether, I don't think so. Hexane is about as non-polar as you can get while diethyl ether, ...
Tuesday, October 21, 2008 at 12:36pm by DrBob222

org chm
how many grams of KOH are needed to make 590 ml of a solution with a pH of 11.35?
Wednesday, November 17, 2010 at 10:05am by carol

chm
What is the theoretical yield of iron if we begin the reaction with 10.5g of AL (assume an excess of Fe2)3)
Friday, October 21, 2011 at 8:00am by karol

CHM
ththe rusting of iron in a humid atmosphere decomposition of water into hydrogen and oxygen gases
Sunday, January 27, 2013 at 11:29pm by jakey

Chemistry
http://preparatorychemistry.com/Bishop_solubility_temperature.htm http://www.elmhurst.edu/~chm/vchembook/174temppres.html
Saturday, January 29, 2011 at 1:53pm by DrBob222

Chemistry
http://www.elmhurst.edu/~chm/vchembook/104Aphysprop.html http://en.wikipedia.org/wiki/Chemical_property
Saturday, November 29, 2008 at 9:12pm by DrBob222

science
http://en.wikipedia.org/wiki/Chemical_property http://www.elmhurst.edu/~chm/vchembook/105Achemprop.html
Tuesday, September 1, 2009 at 9:50pm by DrBob222

Chemistry
I found a site for the H2O---H2Te series. Notice that if the trend continued, as we might expect, from H2Te to H2Se to H2S, to H2O, we would expect water to boil about -65 C or so BUT look at the pink line as see that it is MUCH higher than expected (in fact about 165 degrees ...
Tuesday, May 11, 2010 at 7:36pm by DrBob222

CHM 101
do an experiment: Add more corn syrup to the dyes, and see if there is a change. YOu can do the same with the rest of the chems.
Saturday, March 12, 2011 at 6:21pm by Engineer at Refinery

Indicators and Solutions
Here are two sites. The first one describes the test with Benedict's solution for simple sugars. The second one describes the iodine test for starch. http://www.sciencecompany.com/sci-exper/food_chemistry.htm http://www.elmhurst.edu/~chm/vchembook/548starchiodine.html
Tuesday, December 4, 2007 at 2:30am by DrBob222

CHM
Which of the following is not an example of a physical change? is this the right Answer accidentally leaving a piece of toast in the toaster until it is completely black
Sunday, January 27, 2013 at 11:24pm by Jakey

CHM
How many liters in volume are occupied by 250 liters of bromine at STP?
Sunday, March 17, 2013 at 11:13pm by Anonymous

chm
If a neutral element has 8 neutrons and 7 electrons, which expression correctly identifies the element?
Wednesday, February 27, 2013 at 12:20pm by jj

CHM
All of the examples given are examples of a chemical change. Methane contains carbon and hydrogen but no oxygen.
Sunday, January 27, 2013 at 11:29pm by DrBob222

Chm 2046
Use the Clausius-Clapeyron equation. You know p = 1 atm when T = 351K. Solve for p2 when T = 1.35 atm.
Friday, February 1, 2013 at 8:42pm by DrBob222

science
Ionic compounds are polar. Covalent bonds may be completely covalent or they may have some ionic character. Those we call polar covalent. Some prefer to label compounds as ionic or polar covalent and call covalent compounds as polar or non-polar. Here is a site, not a ...
Wednesday, December 5, 2007 at 5:41am by DrBob222

CHM
Calculate the solubility of Cu(oh)2 in grams per liters of solution if Ksp for Cu(OH)2 IS 4.8X 10^-20
Sunday, June 27, 2010 at 1:30pm by ami

CHM
Which is the only equation with no 3s in it? It can't be 1, 2, 4, or 5 because all of those require a three somewhere to balance it. And the answer has no other 3s.
Wednesday, October 10, 2012 at 10:24pm by DrBob222

CHM
250 L, but if you meant moles then 250*(22.4L)= volume at STP. Your question doesn't make that much sense.
Sunday, March 17, 2013 at 11:13pm by Devron

CHM formula needed, pls?
How many milliliters of a 0.25 M sucrose solution contain 2.0 grams? The molar mass of sucrose (C12H22O11 ) is 342.3 g/mol.
Monday, November 19, 2012 at 6:49pm by V

Chm
What is the molarity of a saturated solution of potassium sulfate if the solubility is 13 g per 100 g H2O at 25C? The density of the solution is 1.1 g/mL
Thursday, January 17, 2013 at 6:04pm by Chris

chm
I'm not sure I like the way these are stated but the answer probably comes the closest to the last one; i.e, the noble gas atoms, especially He atoms.
Wednesday, February 20, 2013 at 11:48pm by DrBob222

Biology(Organic Compounds)
Since this is not my area of expertise, I searched Google under the key words "monomers starch" to get these possible sources: (Broken Link Removed) http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/Carbohydrates.html http://www.elmhurst.edu/~chm/vchembook/547cellulose....
Friday, February 22, 2008 at 4:28pm by PsyDAG

chm
Write the equation and set up an ICE chart. This mixture will prepare a buffer. Use the Henderson-Hasselbalch equation to solve for pH.
Wednesday, March 31, 2010 at 4:23pm by DrBob222

CHM 152
How many gram of Fe+3 are required to make 1.0 L of an aqueous solution of 10 ppm Fe+3? Assume density of water is 1.00 g/mL.
Tuesday, June 8, 2010 at 12:05am by Car

CHM 152
A 0.750 L bottle of a French Merlot is said to contain 12.5% alcohol by volume. How much of the liquid, in mL, in the bottle is water?
Tuesday, June 8, 2010 at 9:15pm by Car

CHM
Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the following concentrations A) 0.377 M B) 0.107 M C) 4.16*10^-2 M Ka= 1.9*10^-5
Monday, October 8, 2012 at 12:52am by Jordan

CHM formula needed, pls?
How many milliliters of a 0.25 M sucrose solution contain 2.0 grams? The molar mass of sucrose (C12H22O11 ) is 342.3 g/mol.
Monday, November 19, 2012 at 7:13pm by Vc

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