How do I know where hexane and toluene fractions are collected in a distillation?
Q. For my chem lab report, I have to graph temperature versus volume for a distillation. The question is, where on the graph would the hexane and toluene fractions be collected? I don't know. How can I tell?
Asked by Thing - Sat Feb 23 00:37:19 2008 - - 2 Answers - 0 Comments
A. hexane and toulene fractions come under different temperature of their boiling point!!! and the vary in volume too according to their crude feed. so using the temperature u can find the fraction!!!
Answered by sunil - Sat Feb 23 00:42:55 2008
Q. For my chem lab report, I have to graph temperature versus volume for a distillation. The question is, where on the graph would the hexane and toluene fractions be collected? I don't know. How can I tell?
Asked by Thing - Sat Feb 23 00:37:19 2008 - - 2 Answers - 0 Comments
A. hexane and toulene fractions come under different temperature of their boiling point!!! and the vary in volume too according to their crude feed. so using the temperature u can find the fraction!!!
Answered by sunil - Sat Feb 23 00:42:55 2008
What type of intermolecular forces operate for hexane and water individually?
Q. What type of intermolecular forces operate for hexane and water individually? When they are mixed are there stronger or weaker forces operating between the two components of the mixture than within each pure liquid? And which operate for 1-butanol and water, and acetone and water.
Asked by Chelsey - Tue Feb 2 16:15:53 2010 - - 3 Answers - 0 Comments
A. Hexane C6H14 - has London dispersion forces Water-H2O has hydrogen bonds when hexane and water are mixed the intermolecular force is weak London dispersion forces When 1-butanol and water are mixed the intermolecular force is H-bonding( both have -OH groups) When acetone and water are mixed the intermolecular force is dipole-dipole attraction
Answered by halogen - Tue Feb 2 16:23:29 2010
Q. What type of intermolecular forces operate for hexane and water individually? When they are mixed are there stronger or weaker forces operating between the two components of the mixture than within each pure liquid? And which operate for 1-butanol and water, and acetone and water.
Asked by Chelsey - Tue Feb 2 16:15:53 2010 - - 3 Answers - 0 Comments
A. Hexane C6H14 - has London dispersion forces Water-H2O has hydrogen bonds when hexane and water are mixed the intermolecular force is weak London dispersion forces When 1-butanol and water are mixed the intermolecular force is H-bonding( both have -OH groups) When acetone and water are mixed the intermolecular force is dipole-dipole attraction
Answered by halogen - Tue Feb 2 16:23:29 2010
What happens when hexane is ignited in an evaporating basin?
Q. What happens when you add bromine water to hexane? What is the reaction type for the reaction with bromine? Also what would happen if you did the same experiments with cyclohexane? Please help! Thanks =)
Asked by Janey - Wed May 27 09:32:04 2009 - - 2 Answers - 0 Comments
A. This is a topic in organic chemistry under qualitative analysis of organic compounds. Hexane is a good example of saturated hydrocarbon which means that all carbons have either four or three hydrogens bonded to them and there are no double bonds, triple bonds or rings. Saturated hydrocarbons are also grouped together because they react more or less the same way. These two procedures (igniting and adding bromine water) that you've mentioned in fact tests for the unsaturation of compounds. The first one--called the ignition test (for unsaturation)--is where you ignite a substance in the evaporating dish and you observe the smoke above the flame. The darker or sootier the smoke, the more unsaturated the compound. On the other hand if… [cont.]
Answered by happyman - Wed May 27 10:53:23 2009
Q. What happens when you add bromine water to hexane? What is the reaction type for the reaction with bromine? Also what would happen if you did the same experiments with cyclohexane? Please help! Thanks =)
Asked by Janey - Wed May 27 09:32:04 2009 - - 2 Answers - 0 Comments
A. This is a topic in organic chemistry under qualitative analysis of organic compounds. Hexane is a good example of saturated hydrocarbon which means that all carbons have either four or three hydrogens bonded to them and there are no double bonds, triple bonds or rings. Saturated hydrocarbons are also grouped together because they react more or less the same way. These two procedures (igniting and adding bromine water) that you've mentioned in fact tests for the unsaturation of compounds. The first one--called the ignition test (for unsaturation)--is where you ignite a substance in the evaporating dish and you observe the smoke above the flame. The darker or sootier the smoke, the more unsaturated the compound. On the other hand if… [cont.]
Answered by happyman - Wed May 27 10:53:23 2009
What are the molar extinction coefficient/ molar absorptivity values of Chlorophyll in hexane?
Q. Molar extinction coefficient/ Molar absorptivity are constants, depending on the absorbance, length of the cuvette and concentration. Am i right? Would it be affected by the solvent used for column chromatography? Any idea what are the values of the molar extinction coefficient of Chlorophyll (specifically Chlorophyll a and b in hexane) ?? Thanks!
Asked by mouldymou - Fri Aug 27 15:51:48 2010 - - 1 Answers - 0 Comments
A. The specific coefficient of extinction of chlorophyll a at 664 nm in 80 % acetone is 89,0 cm2/mg, the molar coefficient is 79,5 cm2/ mol. The given values may differ slightly in hexane. Constants are constant and not depending on path-length of the cuvette or concentration. Extinction depends on it not the coefficient.
Answered by picus48 - Thu Sep 2 15:04:53 2010
Q. Molar extinction coefficient/ Molar absorptivity are constants, depending on the absorbance, length of the cuvette and concentration. Am i right? Would it be affected by the solvent used for column chromatography? Any idea what are the values of the molar extinction coefficient of Chlorophyll (specifically Chlorophyll a and b in hexane) ?? Thanks!
Asked by mouldymou - Fri Aug 27 15:51:48 2010 - - 1 Answers - 0 Comments
A. The specific coefficient of extinction of chlorophyll a at 664 nm in 80 % acetone is 89,0 cm2/mg, the molar coefficient is 79,5 cm2/ mol. The given values may differ slightly in hexane. Constants are constant and not depending on path-length of the cuvette or concentration. Extinction depends on it not the coefficient.
Answered by picus48 - Thu Sep 2 15:04:53 2010
Why is it better or more healthful to buy cooking oil or even vitamins that say cold-pressed, hexane free?
Q. What is hexane, why is it harmful, and what does being cold-pressed mean? To buy items that are cold-pressed and hexane free, is that a health benefit, and why?
Asked by phantom8000 - Wed Jul 2 22:27:14 2008 - - 2 Answers - 0 Comments
A. I know that there is info on it in saving dinner dot com. Leanne explains it...
Answered by charisma - Wed Jul 2 22:31:53 2008
Q. What is hexane, why is it harmful, and what does being cold-pressed mean? To buy items that are cold-pressed and hexane free, is that a health benefit, and why?
Asked by phantom8000 - Wed Jul 2 22:27:14 2008 - - 2 Answers - 0 Comments
A. I know that there is info on it in saving dinner dot com. Leanne explains it...
Answered by charisma - Wed Jul 2 22:31:53 2008
will hexane and neohexane have the same chemical and physical properties?
Q. B) If hexane and neohexane were mixed to gather, how could you separate them?
Asked by Kiara D - Fri Jan 22 23:04:34 2010 - - 1 Answers - 0 Comments
Q. B) If hexane and neohexane were mixed to gather, how could you separate them?
Asked by Kiara D - Fri Jan 22 23:04:34 2010 - - 1 Answers - 0 Comments
Would it be safe to boil a hydrocarbon like pentane or hexane?
Q. I have a substance identification text today. I know the boiling points of pentane and hexane so would it be safe to heat them substances up until they boil?
Asked by sharp_shooter5454 - Wed Dec 9 12:58:41 2009 - - 2 Answers - 0 Comments
A. it depends on the method you use to heat the materials. if you use a standard taper glassware set and a heating mantle with a lab jack, yes it is safe. if you use an open vessel (beaker, erlynmeyer, or florence flask) and an open flame (bunsen burner) then no, it is terribly dangerous.
Answered by mike H - Wed Dec 9 13:10:01 2009
Q. I have a substance identification text today. I know the boiling points of pentane and hexane so would it be safe to heat them substances up until they boil?
Asked by sharp_shooter5454 - Wed Dec 9 12:58:41 2009 - - 2 Answers - 0 Comments
A. it depends on the method you use to heat the materials. if you use a standard taper glassware set and a heating mantle with a lab jack, yes it is safe. if you use an open vessel (beaker, erlynmeyer, or florence flask) and an open flame (bunsen burner) then no, it is terribly dangerous.
Answered by mike H - Wed Dec 9 13:10:01 2009
what is the significance of performing SOLVENT PARTITIONING using hexane and ethyl acetate?
Q. if you have a source, id very much appreciate it. im performing solvent partitioning (using hexane and ethyl acetate) from an ethanolic plant extract. i need sources! :) ill be using hexane and ethyl acetate separately. hexane first, then ethyl acetate. my extract was soaked in ethanol.
Asked by marketer - Tue Feb 10 04:30:49 2009 - - 2 Answers - 0 Comments
Q. if you have a source, id very much appreciate it. im performing solvent partitioning (using hexane and ethyl acetate) from an ethanolic plant extract. i need sources! :) ill be using hexane and ethyl acetate separately. hexane first, then ethyl acetate. my extract was soaked in ethanol.
Asked by marketer - Tue Feb 10 04:30:49 2009 - - 2 Answers - 0 Comments
can hexane be used in place of toluene for extraction of the same substance?
Q. I want to know whether they are same enough so that if toluene extracts something out from a solution, will hexane do it? I only have hexane in my lab right now... I am trying to extract a secondary plant product-a terpene
Asked by rubens gates - Mon Jan 11 06:49:59 2010 - - 3 Answers - 0 Comments
A. quite likely, but without you telling us exactly what you are trying to extract, people answering can only guess!
Answered by Colin - Mon Jan 11 07:19:33 2010
Q. I want to know whether they are same enough so that if toluene extracts something out from a solution, will hexane do it? I only have hexane in my lab right now... I am trying to extract a secondary plant product-a terpene
Asked by rubens gates - Mon Jan 11 06:49:59 2010 - - 3 Answers - 0 Comments
A. quite likely, but without you telling us exactly what you are trying to extract, people answering can only guess!
Answered by Colin - Mon Jan 11 07:19:33 2010
When using hexane on a water sample to extract oil and grease-what techniques have the best recovery rate?
Q. why hexane? the epa requires it.
Asked by 13Mintcar - Thu Feb 28 19:08:38 2008 - - 3 Answers - 0 Comments
A. EPA requires it because hexane is pretty clean and its relatively non-toxic. Recover rate depends on many factors. In general, multiple extractions usually work better than single large volume extractions. Meaning, rather than extracting with 60mL of hexane over your sample, using 20mL of hexane and extract samples 3 times usually works better. Also, the volume of hexane compared to the volume of sample/water is important as well. If you have a 100mL sample, extracting with 20mL of hexane 3 times probably won't give you a good recovery. I would use the same volume as the sample to extract or more. Next, what are other processes involved to determine the recovery rate? Is there a drying step involved? Sometimes the drying step can… [cont.]
Answered by Amoeba - Sat Mar 1 15:15:19 2008
Q. why hexane? the epa requires it.
Asked by 13Mintcar - Thu Feb 28 19:08:38 2008 - - 3 Answers - 0 Comments
A. EPA requires it because hexane is pretty clean and its relatively non-toxic. Recover rate depends on many factors. In general, multiple extractions usually work better than single large volume extractions. Meaning, rather than extracting with 60mL of hexane over your sample, using 20mL of hexane and extract samples 3 times usually works better. Also, the volume of hexane compared to the volume of sample/water is important as well. If you have a 100mL sample, extracting with 20mL of hexane 3 times probably won't give you a good recovery. I would use the same volume as the sample to extract or more. Next, what are other processes involved to determine the recovery rate? Is there a drying step involved? Sometimes the drying step can… [cont.]
Answered by Amoeba - Sat Mar 1 15:15:19 2008
Does potassium chloride or Iodine dissovle well in hexane?
Q. Which one dissolves better in hexane? Potassium Chloride or Iodine? why is that?
Asked by K P - Tue Apr 6 11:58:27 2010 - - 1 Answers - 0 Comments
A. Hexane is non-polar, and so is iodine, so iodine will dissolve in hexane. Potassium chloride is ionic, and highly polar. Since hexane is not polar, it will not dissociate the potassium and chloride ions in potassium chloride so the KCl will not dissolve. Hope this answers your question.
Answered by Reginald - Tue Apr 6 12:09:48 2010
Q. Which one dissolves better in hexane? Potassium Chloride or Iodine? why is that?
Asked by K P - Tue Apr 6 11:58:27 2010 - - 1 Answers - 0 Comments
A. Hexane is non-polar, and so is iodine, so iodine will dissolve in hexane. Potassium chloride is ionic, and highly polar. Since hexane is not polar, it will not dissociate the potassium and chloride ions in potassium chloride so the KCl will not dissolve. Hope this answers your question.
Answered by Reginald - Tue Apr 6 12:09:48 2010
I accidentily sprayed a silicon lube spray with hexane as propelent on my airsoft gun! what do I do?
Q. I was told to use silicon spray and it contains hexane as a propelent is there a way to stop my gun from breaking?
Asked by Big Dipper - Wed Jul 21 15:56:30 2010 - - 1 Answers - 0 Comments
A. Try to get it out with some gun solvent asap!
Answered by DiGGs - Wed Jul 21 15:58:48 2010
Q. I was told to use silicon spray and it contains hexane as a propelent is there a way to stop my gun from breaking?
Asked by Big Dipper - Wed Jul 21 15:56:30 2010 - - 1 Answers - 0 Comments
A. Try to get it out with some gun solvent asap!
Answered by DiGGs - Wed Jul 21 15:58:48 2010
How do you decide if Hexane C6 H16 is soluble in water?
Q. Carbon 6 Hyrdogen 16. I have no clue how to decide if its solube in water. .
Asked by ask & I will answer - Mon May 11 10:17:56 2009 - - 3 Answers - 0 Comments
A. hexane is what is known as an alkane .It has only C and H bonds and as such has no polar area of the molecule..it cannot form hydrogen bonds with water and thus cannot be hydrated.This means that it will be hydrophobic and have near zero solubility in water. Compare to diethyl ether C2H5-O-C2H5..although it is principally C-H bonds the one oxygen present can hydrogen bond with the OH of water thus..ether is weakly soluble in water ( ~ 2 % ). Contrast that to methanol, CH3OH, where the OH of the alcohol is very acitive in hydrogen bonding to water and to itself ..forming a highly structured hydration sphere with methanol in the core= highly soluble in water.
Answered by Merlin's Feline - Mon May 11 10:29:33 2009
Q. Carbon 6 Hyrdogen 16. I have no clue how to decide if its solube in water. .
Asked by ask & I will answer - Mon May 11 10:17:56 2009 - - 3 Answers - 0 Comments
A. hexane is what is known as an alkane .It has only C and H bonds and as such has no polar area of the molecule..it cannot form hydrogen bonds with water and thus cannot be hydrated.This means that it will be hydrophobic and have near zero solubility in water. Compare to diethyl ether C2H5-O-C2H5..although it is principally C-H bonds the one oxygen present can hydrogen bond with the OH of water thus..ether is weakly soluble in water ( ~ 2 % ). Contrast that to methanol, CH3OH, where the OH of the alcohol is very acitive in hydrogen bonding to water and to itself ..forming a highly structured hydration sphere with methanol in the core= highly soluble in water.
Answered by Merlin's Feline - Mon May 11 10:29:33 2009
What is the mole fraction of hexane?
Q. A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 257 . Pure pentane and hexane have vapor pressures of 425 and 151 , respectively, at room temperature.
Asked by Katrin - Wed Feb 6 15:16:49 2008 - - 1 Answers - 0 Comments
A. Stable excess electrons have been recently observed in liquid hydrocarbons after suitable purification, but the mobilities indicated the existence of short-lived electron traps in the liquids. We have measured electron mobilities in mixtures of n-hexane and neopentane and find that the mobility is given accurately by an expression of the form = nexp(-xhE / kT), where xh is the mole fraction of hexane. It is concluded that the trap cannot be a negative-ion state of a single molecule, but is instead a collective trap involving several fluid molecules.
Answered by Mizz Mavia - Wed Feb 6 16:37:16 2008
Q. A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 257 . Pure pentane and hexane have vapor pressures of 425 and 151 , respectively, at room temperature.
Asked by Katrin - Wed Feb 6 15:16:49 2008 - - 1 Answers - 0 Comments
A. Stable excess electrons have been recently observed in liquid hydrocarbons after suitable purification, but the mobilities indicated the existence of short-lived electron traps in the liquids. We have measured electron mobilities in mixtures of n-hexane and neopentane and find that the mobility is given accurately by an expression of the form = nexp(-xhE / kT), where xh is the mole fraction of hexane. It is concluded that the trap cannot be a negative-ion state of a single molecule, but is instead a collective trap involving several fluid molecules.
Answered by Mizz Mavia - Wed Feb 6 16:37:16 2008
What products are formed when ethanol and hexane undergo combustion?
Q. Just need to know for chemistry class...a breakdown or formula/solution showing how you know would be great (if you can)!!
Asked by Smarties! - Wed May 26 23:55:27 2010 - - 1 Answers - 0 Comments
A. when hyrdocarbons undergo combustion they always turn into CO2 and H2O just at different ratios
Answered by Ryan - Thu May 27 00:04:59 2010
Q. Just need to know for chemistry class...a breakdown or formula/solution showing how you know would be great (if you can)!!
Asked by Smarties! - Wed May 26 23:55:27 2010 - - 1 Answers - 0 Comments
A. when hyrdocarbons undergo combustion they always turn into CO2 and H2O just at different ratios
Answered by Ryan - Thu May 27 00:04:59 2010
What aspect of 2 hexane molecules with the geometry makes these bonds effective?
Q. What aspect of 2 hexane molecules with the geometry makes these bonds effective?
Asked by ?Help Me? - Wed Nov 7 18:26:59 2007 - - 1 Answers - 0 Comments
A. They can nestle together if they're in the same configuration, i.e., both chair, or both boat.
Answered by papastolte - Wed Nov 7 18:31:55 2007
Q. What aspect of 2 hexane molecules with the geometry makes these bonds effective?
Asked by ?Help Me? - Wed Nov 7 18:26:59 2007 - - 1 Answers - 0 Comments
A. They can nestle together if they're in the same configuration, i.e., both chair, or both boat.
Answered by papastolte - Wed Nov 7 18:31:55 2007
What are the environmental consequences of disposing kerosene, toluene and hexane in the sink?
Q. Does anyone know?
Asked by Maty - Thu Oct 30 14:56:32 2008 - - 4 Answers - 0 Comments
A. 1 drop, nothing. 10 gallons, that would be different. They will eventually vaporize and add to air pollution as the are hazardous air pollutants. They will increase Ozone and smog. In the water, the toluene and other BETX's in the kerosene are suspected carcinogens.
Answered by vicinic - Thu Oct 30 18:00:00 2008
Q. Does anyone know?
Asked by Maty - Thu Oct 30 14:56:32 2008 - - 4 Answers - 0 Comments
A. 1 drop, nothing. 10 gallons, that would be different. They will eventually vaporize and add to air pollution as the are hazardous air pollutants. They will increase Ozone and smog. In the water, the toluene and other BETX's in the kerosene are suspected carcinogens.
Answered by vicinic - Thu Oct 30 18:00:00 2008
How can halognes be identified in the aqueous layer and the hexane layer of a mixture?
Q. Which layer is more useful in identifying the halogens
Asked by the new guy - Mon Nov 9 23:20:40 2009 - - 1 Answers - 0 Comments
Q. Which layer is more useful in identifying the halogens
Asked by the new guy - Mon Nov 9 23:20:40 2009 - - 1 Answers - 0 Comments
What is the pressure of hexane gas, C6H14, that reacts with oxygen gas to form 200 grams of carbon dioxide and?
Q. water vapor at a temperature of 1200C in a rigid container with a volume of 25 liters?
Asked by splashy1014 - Mon Jul 26 20:07:39 2010 - - 1 Answers - 0 Comments
A. 2 C6H14 +19 O2 = 12 CO2 + 14 H2O moles CO2 = 200 g / 44 g/mol=4.55 moles C6H14 = 4.55 x 2 /12 =0.758 p = 0.758 x 0.08206 x 1473 K/ 25 =3.67 atm
Answered by Dr.A - Tue Jul 27 08:56:27 2010
Q. water vapor at a temperature of 1200C in a rigid container with a volume of 25 liters?
Asked by splashy1014 - Mon Jul 26 20:07:39 2010 - - 1 Answers - 0 Comments
A. 2 C6H14 +19 O2 = 12 CO2 + 14 H2O moles CO2 = 200 g / 44 g/mol=4.55 moles C6H14 = 4.55 x 2 /12 =0.758 p = 0.758 x 0.08206 x 1473 K/ 25 =3.67 atm
Answered by Dr.A - Tue Jul 27 08:56:27 2010
How does hexane remove both soluble and insoluble impurities during solvent extraction?
Q. How does hexane remove both soluble and insoluble impurities during solvent extraction?
Asked by laura - Thu Mar 27 12:27:28 2008 - - 1 Answers - 0 Comments
A. Actually the hexane only dissolves the soluble impurities. The insoluble impurities could be removed by decanting or filtration.
Answered by Richard - Mon Mar 31 11:20:56 2008
Q. How does hexane remove both soluble and insoluble impurities during solvent extraction?
Asked by laura - Thu Mar 27 12:27:28 2008 - - 1 Answers - 0 Comments
A. Actually the hexane only dissolves the soluble impurities. The insoluble impurities could be removed by decanting or filtration.
Answered by Richard - Mon Mar 31 11:20:56 2008
From Yahoo Answer Search: 'hexane'
Tue Sep 7 20:15:23 2010 [ refresh local cache ]
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ktul.com
Sat, 31 Jul 2010 22:20:28 GMT+00:00
KTUL (blog) Sand Springs fire chief Mark Joslin said a line carrying hexane began leaking around 2:00 pm He estimated that 100 gallons of the highly-flammable fluid ...
![[(CO)4W(PH3)2] as a Source of Semi-interstitial Phosphorus Ligands ...](/TEBr7-FPNr7-FOHCs707-s707-n807-CGGUq8-YEHs8-KCFNr7-RTNZVs7-TEBr7-FGBUFOZHUGr7-ARCB-out.jpg)
pubs.acs.org
Cornelia Dreher et al
ue, 27 Jul 2010 15:42:47 GM
Compounds 1 and 3 are soluble in nonpolar solvents, such as n-. hexane. or toluene, whereas 2 and 4 are only soluble in more polar solvents such as CH2Cl2. In the FD mass spectra of 1, 2, and 4 the appropriate molecular ion peaks are found ...
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