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December 18, 2014

Search: Solvents

Number of results: 87

chem help!!!
What are some uses of ketones? solvents.. Solvents, plastic cements, varnishes
June 22, 2006 by katrina

Organic Chemistry
Referring to solvent mixtures, which statements are TRUE ? (Select all correct answers.) The solvents of the solvent mixture should have very similar polarities. The solvents of the solvent mixture should have different polarities. The student has to pay more attention during...
April 29, 2010 by Nataly

Organic Chemistry Help Please
We're going over the reactions involving Alkenes and Alkynes. However, I'm extremely confused I how to determine with solvent/solvents to use and also when already given the solvents with the reactants how this will effect the products. I studied the basic mechanisms for all ...
November 20, 2013 by Sarah

Solvents
Question: Each of the solvents given should effectively separate one of following mixtures by TLC. Match the appropriate solvent with the mixture that you would expect to separate well with that solvent. Select your solvent from the following: hexane, methylene chloride, or ...
October 14, 2006 by Sheryl

Chemistry
Hi, Why are ionic compounds generally insoluble in organic solvents while covalent compounds are generally soluble in organic solvents? Can you please explain in more detail? Thank you.
March 4, 2009 by Aline

chemistry
The simple rule “Like dissolves like” is often used to describe the solubility of a substance in different solvents. Write a short paragraph discussing your evidence for this rule. Include in your discussion where you think this rule works best and where it seems to be less ...
February 27, 2011 by j

Chemistry
Consider the below three solvents and the corresponding values of Kf for each. Prove, using the formula for Kf, which one of these solvents would allow for the most sensitive procedure for determining the molar mass by the freezing point depression method. Explain well to ...
February 13, 2012 by Heaton

Chemistry
1. Water is a polar molecule. Therefore, it acts as a polar sollvent. a) Think about the following compounds: iodine, cobalt (II) chloride and sucrose (C12H22O11). Which compounds are soluble in water. b) Assume that the interaction between solutes and solvents that you ...
November 6, 2007 by Marty

ap chemistry
methanol and ethanol are common organic solvents. if the mole fraction of CH3OH in a mixture of the two solvents is 0.4 what is the mole fraction of methanol in the vapor in equilibrium wih the liquid mixture at room temperature 25 celius. the vapor pressure ofmethanol and ...
February 23, 2011 by jj

science(chemistry)
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 and why?) (n-Octane, n-Hexane, Decane, Acetone, 1-Propanol, 2-Propanol, Ethanol, Toluene, Cyclohexane, Methanol, n-Heptane, n-Pentane, Butanol) I saw 2...
April 24, 2009 by ~christina~

Science
Why are ethers good aprotic solvents?
March 22, 2011 by Anonymous

Science
In lab the other day we did an acid/base extraction to separate mixtures. The top layer of the mixture is the organic layer, which consists of diethyl ether and fluorine. The bottom layer is considered to be the aqueous layer, which consists of water and benzoate anion. The ...
February 4, 2013 by Kayla

science
Am I correct to label hot chocolate and ocean water as solvents
January 13, 2012 by howard

Biology
What does the net movement of solutes/solvents during osmosis and diffusion mean?
October 20, 2010 by Emily

Chemistry
Which of these solvents: hexane, ethanol,or distilled water, would work as effective grease removers?
March 21, 2010 by Tina

Chemistry
What is the importance of a freezing point depression graph and why and what things change when different solutes and solvents are added?
March 25, 2010 by Kathleen

Intergrated science
What are the various solvents for the following solutes? a. wax b. plant pigment c. glucose d. coaltar e. fat
November 22, 2011 by Makinin

chem
Explain why ethanol and acetone are not suitable solvents for extracting organic compounds from aqueous solutions. does it have to do with their density?
October 14, 2008 by Jason

Science(chem)
I have a few questions I need help with! 1. Hydrogen bonding will account for the unusual physical properties of water. TRUE FALSE 2. Air is considered to be a homogeneous mixture that is 79% nitrogen gas, 20% oxygen gas and 1% all the other gases. In this mixture, nitrogen ...
March 12, 2008 by salinas

Chemistry-simple explanation needed
How do you explain why ionic compounds are generally soluble in water without using the term "polar solvents"?
March 22, 2009 by carrie

Chemistry
Please help me with this! Rank the solvents according to their polarities, from the most polar to nonpolar. ethyl acetate, water, acetone, hexane, ethanol
September 28, 2011 by Michelle

CHEMISTRY
list three differences between molecular and ionic compounds, and explain how they relate to the differences in bond types.....how do i relate to the differences in bond types? List the differences and we'll talk about how they relate to the bond type. 1. molecular compounds ...
December 6, 2006 by INEEDHELP!!!

Chemistry
how do i tell if something can dissolve into another the question is which f these solvents will dissolve salt, NaCl?
December 2, 2008 by Mia

Organic Chemistry
Explain why methanol and acetone are not suitable solvents for extracting organic compounds from aqueous solutions.
January 21, 2010 by Casey

chemistry
summarize the solubilty behavior of hydrocarbons in water (a polar solvent) and in non polar organic solvents
November 22, 2011 by denis

chemistry
I think, by convention, most would consider the solvent as the major component and the others as solutes. Actually, however, it dosesn't matter. I just read that when one liquid is dissolved in another, the minor component is usually considered the solute and the major ...
February 28, 2007 by DrBob222

Chem 262
What solvents would you use to isolate these compounds? Malonic Acid Salicylic acid Ethyl4-aminobenzoate
February 10, 2011 by Sandra

science(chem)
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 would I just be able to analyze it in UV spec? I assume that the solvents used to dissolve the compound, would be used as a blank, right? I tried to...
May 5, 2009 by ~christina~

chemistry
Why do pure solvents show a level of horizontal curve as solidification occurs, but the curve for the solution sloped downward slightly? Thanks
March 4, 2009 by Tanimura

Chemistry
What are the characteristics of an ionic bond? Hard, often brittle, high melting point, often soluble in polar solvents such as water. Of course there are exceptions.
November 14, 2006 by Bryan

Chemistry please check
1. An ionic compound solution is a(an)________ of electric current. non-conductor absorber emitter good conductor reverser ans: good conductor 2. Hydrogen bonding in water accounts for water's higher than expected boiling temperature the fact that ice floats in liquid water ...
February 24, 2008 by Mary

chemistry
In a 70-30 mix of isopropyl alcohol and water, which is the solvent? Or are they both solvents? GENERALLY, we call the one there in the larger about the solvent and the other one the solute.
May 1, 2007 by anonymous

Organic Chem Help :(
For each of the solvents below, indicate whether it will be the top or bottom layer when carrying out extraction of an aqueous layer of density 1.05 g/ml. a) chloroform (bottom layer) b) hexane =????? c) toluene =?????
September 13, 2014 by JuYoung

chemistry
describe basic steps to take re-crystalizing synthesized aspirin. using two solvents to perform this task (ethanol and water)which solvent should be used to dissolve the aspirin and which one should force it out of the solution
November 13, 2012 by morgan

Ochem Lab
why is it important to spot samples directly on the marks made on the TLC plate? This is for Thin Layer Chromotography. Is this important so that the solvents move directly up the plate and can be identifies easily? Thanks
October 24, 2010 by Adam

TLC
The following two solvents systems were found to separate compounds x and y by flash column chromatography: X- hexanes/ethyl acetate 10:1 Y- hexanes/ethyl acetate 10:4 which is more polar X or Y? Which solvent system must be used first?
February 18, 2007 by sue

o-chem
Explain whether or not each of the following pairs of solvents might be useful as a solvent pair for recrystallization. (a) ethanol-methanol (b) hexane-cyclohexane (c) acetone-ethanol (d) water-ethanol (e) water-cyclohexane
September 29, 2008 by David

Chemistry
What other physical properties other than specific heat could be used to identify metals? spectroscopic lines and density to name two others. Melting point, boiling point, solubility in certain solvents are three others.
March 15, 2007 by Jen

Organic Chemistry
Explain whether or not each of the following pairs of solvents might be useful as a solvent pair for recrystallization. (a) ethanol-methanol (b) hexane-cyclohexane (c) acetone-ethanol (d) water-ethanol (e) water-cyclohexane
August 25, 2009 by John

chemistry re crystalizing
describe basic steps to take re-crystalizing synthesized aspirin. using two solvents to perform this task (ethanol and water)which solvent should be used to dissolve the aspirin and which one should force it out of the solution
November 13, 2012 by justin

chemistry
Which of the following sets of solute and solvents will make a homogeneous solution? (naphthalene is a non-polar organic molecule) 1. Water and benzene 2. Benzene and ammonium nitrate 3. Benzene and naphthalene 4. Water and naphthalene
November 29, 2011 by katie

chemistry!
Of the four general types of solids [molecular, ionic, network covalent, metallic], which one[s] are generally soluble in nonpolar solvents? I'm thinking either molecular or ionic. Are either [or both] correct? molecular: like dissolves like is the rule of thumb.
December 7, 2006 by Alex

science
carbon disulphide and water are two immiscible solvents and iodine is more soluble in carbon disulphide than in water.is it possible to extract out iodine completely from it's aquous solution by use of carbon disulphide.give a comment
November 13, 2014 by Viva

Biology
In the final step of DNA extraction from E. Coli bacteria, we used ethanol so that the DNA would precipitate. Why is it that DNA precipitates in ethanol, and not in water? Both of them are polar solvents, and so is DNA. So why doesn't water make DNA precipitate?
November 11, 2008 by Christiaan

extraction
How to distingush organic layer and aqueous layer? The organic layer is the one on top. Most organic solvents are less dense than water. (NOte: Non-hydrocarbons such as chloroform, methylene chloride, carbon tetrachloride etc are more dense than water.)
August 21, 2007 by bb

Chemistry
Each of the solvents given should effectively separate of the following mixtures by TLC. Match the appropriate solvent with the mixture that you would expect to separate well with the solvent. Select your solvent from the following: hexane, methylene chloride, or acetone. (a) ...
October 9, 2008 by Nina

Organic Chemistry
A lower yield of phosphonium salt is obtained in refluxing benzene than in xylene. Look up the boiling points for these solvents, and explain why the difference in boiling points might influence the yield. I'm not sure how to answer this question. I see that benzene has a ...
June 26, 2012 by Dennis

Chemistry - solubility, not "Methode Champenoise"
Is CO2 soluble in ethanol? I know that CO2 is nonpolar, so that means it's soluble in nonpolar solvents, but CO2 is soluble in H2O. H2O is polar. Also, if CO2 were obeying Henry's Law, would it be soluble in ethanol at a high pressure?
December 11, 2012 by Alex

Solvents
Question: When a TLC plate ws developed, the solvent front ran off the top of the plate. What should be done to correct the error. Me: The only reason I'm giving you this question to check is that it seems too simple. My answer would be to stop development before the solvent ...
October 15, 2006 by Sheryl

Polarity
Benzyl alcohol is not a good sovent with which to crystallize fluorenol. The melting point looks okay so I'm assuming that polarity is the problem. Benzyl alcohol looks polar to me because it has an OH but it is only partly soluble in water. Couldn't find much on fluorenol. ...
September 26, 2006 by Sheryl

Crystallization experiment
We will be conducting a crystallization experiment this week. I was wondering what the most common materials used for this experiment are and what are their best solvents. Thanks from Sheryl alum in water is really good, however, it takes some time for the water to evaporate. ...
September 24, 2006 by Sheryl

Chemistry
CaH2 is so reactive with water that it can be used to "dry" solvents other than water. If a sample if solvent that contains a total of 14g of water is added to 24.6g of calcium hydride, which of these will remain after the reaction is complete: water or calcium hydride? A. ...
October 4, 2009 by Amanda

Chemistry
What is the charatteristic of covalent bonding meaining what happens and then what is the result from what happened (like does it form a molecule, compund, etc. . . Same thing for ionic bodnging The ionic part is discussed below. Look for a chemistry post by smooches. Here is ...
November 30, 2006 by direct in Effect

Chemistry-help needed
I have a question on thin layer chromatography (TLC). My mobile phase (i.e. developing solvent) is a mixture of 2 non-polar solvents. After preparing the mobile phase, is it necessary to pour some into the developing chamber to saturate the chamber or should we only pour the ...
January 31, 2012 by Anne

Chemistry
Are all/most organic compounds non polar? Not all, certainly. Many are non-polar. Most, I don't know. It all depends upon how you define most. Acids, acid chlorides, amines, phenols, ketones, aldehydes, and the like are polar. There are a bunch of those around. There are also ...
April 26, 2007 by Gabriela

Organic Chemistry
separation and purification scheme how would i begin this? we have a mixture of the following:50% benzoic acid, 40% benzoin, 10% dibromobenzene they give us 1M NaOH, 6M NaOH, 1M HCl, 6M HCl, 1M NaHCO3, saturated sodium chloride, diethyl ether, 95% ethanol, methanol, isopropyl ...
October 1, 2010 by Jen

chemistry
Which of the following is NOT true for solutes and solvents? A. At least one solvent must be dissolved in a solute to make a solution. B. Solute concentration can be measured in terms of solute moles / solution volume or solute moles / solvent mass. C. A solvent is the ...
April 4, 2008 by Dino

Chemistry/ OChem
Each of the solvents given should effectively separate of the following mixtures by TLC. Match the appropriate solvent with the mixture that you would expect to separate well with the solvent. Select your solvent from the following: hexane, methylene chloride, or acetone. (a) ...
October 9, 2008 by Neets

Mole fractions in a liquid mixture:
Acetone, C3H6O, and ethyl acetate, C4H8O2, are organic liquids often used as solvents. At 30 degrees C, the vapor pressure of acetone is 285 mm Hg and the vapor pressure of ethyl acetate is 118mm Hg. the solution is prepared at 30 degrees C by dissolving 27.0 g of acetone in ...
September 2, 2010 by Sar

Chemistry
If the same solute is dissolved in two different solvents to the same concentration and the same temperature, the osmotic pressure ____ will be the same for both. will be different. may be the same or different, depending on the solute. will be lower in the solvent with higher...
February 25, 2009 by Anonymous

Bio
1. An isotope is an atom of an element that varies in mass number due to variation in the number of: A. atoms. B. protons. C. neutrons. D. electrons. is it C 2, A covalent bond is: A. the attraction that one atom has for another atom. B. the attraction between two atoms, ...
July 10, 2013 by Amy

Chemistry
I'm so confused as to how to even begin the problem and where to put whats given to me into an equation. 1) If the value of Kp is 0.5 for the distribution of a compound between pentane (solvent 2) and water (solvent 1), and equal volumes of the two solvents were used, how many...
August 10, 2011 by Anonymous

Organic Chemistry
What are the advantages of using a solvent pair for recrystallization? Select all that apply. A) You can control the solubility of the substance in the mixed solvent. B) You don't have to know the exact amounts of the solvents needed. C) You can quickly make the solution ...
September 29, 2011 by Lisa

science(chemistry)
I have a question about solvent evaporation. If I had an organic layer and an aqueous layer in an unknown mixture of liquids and wanted to obtain the solid of a compound(s) dissolved in the layers, is it reasonable to assume that I can run the compound in the IR spectrometer (...
April 17, 2009 by ~christina~

Chemistry check
First, percent error can be negative, correct? Because in my lab I got -32%. Here are my questions that I need checked: 1. List possible manipulation errors that might contribute to the following errors in results: 1) obtaining a significantly larger amount of NaCl than was ...
February 13, 2007 by Jay

Chemistry
A) A compound distributes between water (solvent 1) and benzene (solvent 2) with Kp = 2.7. If 1.0g of the compound were dissolved in 100mL of water, how much compound could be extracted by three 10-mL portions of benzene? B) If the value of Kp is 0.5 for the distribution of a ...
July 18, 2012 by Anonymous

Chemistry
An example of a solution that exhibits a positive deviation from Raoult’s Law (total pressure is greater than expected) is a solution of acetone (CH3COCH3) and carbon disulfide (CS2). a) Draw Lewis structures for these molecules. Explain the deviation from ideal behavior in ...
March 11, 2012 by Laffy Taffy

chemistry
what are 4 chemical properties of organic compounds?i know there non polar molecules and they tend to e soluble in non polar solvents,,but my homework says i need 2 more and i dont know what else..thanks :) Some organic compounds are non-polar and some are polar. In fact, ...
January 3, 2007 by tameka

chemistry
What is the balanced net ionic equation for the reaction of dilute nitric acid with solid aluminum oxide? Frankly, I thought aluminum oxide was insoluble in almost anything except alkali. My CRC Handbook lists it soluble in alkali and organic solvents. The Merck Index lists it...
September 20, 2006 by ryan

Chemistry
If the same solute is dissolved in two different solvents to the same concentration and the same temperature, the osmotic pressure ____ My answer & reason: solution A has a smaller molecular weight and therefore, a larger Molarity and higher osmotic pressure (pi=iMRT) ...
February 25, 2009 by Anonymous

Chemistry
43. List and describe three factors that influence solubility: (Source-wikipedia) The solubility of a given solute in a given solvent typically depends on temperature. For many solids dissolved in liquid water, the solubility increases with temperature up to 100 °C. In liquid ...
November 1, 2010 by mysterychicken

Organic Chemistry
I got some multiple choice questions to practice and I'm not sure of how to get the answers... 1). Which of the following corresponds to the COC bond angle in dimethyl ether?-94 degrees, 110degrees, 180 degrees, 122 degrees, or 60 (i think it's 110 2). classify the reaction ...
May 13, 2008 by Kate

TLC error correction
Question: Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error. A. A two-component mixture containing 1-octene and 1,4-dimethylbenzene gave only one spot with an Rf value of 0.95. The solvent used was acetone. In ...
October 14, 2006 by Sheryl

chemistry
I don't think there is any benzene in Elmer's glue. In fact, I suspect finding something with benzene in it will be tough to do unless you have some OLD OLD bottles of something. Its a carcinogenic thing. If you are looking for something aromatic (meaning aromatic as in ...
February 5, 2007 by DrBob222

chemistry -drbob222
I'm not sure if my 1 and 2 are correct, and I don't know how to do 3, 4, and 5. Any help is appreciated! 1) You wish to extract an organic compound from an aqueous phase into an organic layer. to minimizing the number of transfer steps, would it be better to use an organic ...
October 9, 2009 by Anonymous

Chemistry Plz hurrry
What are charateristic of a ionic bond and a chemical bond? An ionic bond is a type of chemical bond that involves gain or loss of valence (outer shell) electrons in order to attain stability. That is not what I am looking for but thanks anyway An ionic bond IS a chemical bond...
November 30, 2006 by Smooches

science (chem)
consider a sample that is a mixture of biphenyl, benzoic acid, and benzyl alchohol. The sample is spotted on a TLC plate and developed in a methylene chloride cyclohexane mixture. Predict the relative Rf values for the three components in the sample. For assistance use the ...
October 13, 2007 by ~christina~

science (chem) Rf values
consider a sample that is a mixture of biphenyl, benzoic acid, and benzyl alchohol. The sample is spotted on a TLC plate and developed in a methylene chloride cyclohexane mixture. Predict the relative Rf values for the three components in the sample. For assistance use the ...
October 14, 2007 by ~christina~

Identical compounds?
Question: You and another student were each given an unknown compound. Both samples contained colorless material. You each used the same brand of commercially prepared TLC plate and developed the plates using the same solvent. Each of you obtained a single spot of Rf = 0.75. ...
October 13, 2006 by Sheryl

chemistry
Which solvent will dissolve more in given solute: 1. Ethylene glycol (HOCH2CH2OH) in hexane(C6H14) or H2O 2. Diethyl ether (CH2CH2OCH2CH3) in H2O or CH3OH? 3. NaCl in CH3OH or CH3CH2CH2CH2OH I know that like dissolves like. Therefore the molecules with the similar ...
April 26, 2007 by Gabriela

Chemistry Suspension Examples...
I need 10 examples of household suspensions for science class tomorrow. I got 10 solutions, 10 colloids, and 10 solvents...but can't figure out 10 suspensions! Help! http://www.elmhurst.edu/~chm/vchembook/106Amixture.html Suspensions have much larger particles: usually over ...
June 15, 2005 by Nat

TLC purity
Question: A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which the Rf value is 0.95, is observed. Does this indicate that the unknown material is a pure compound? What can be done to verify the purity of the ...
October 13, 2006 by Sheryl

Need help creating a monthly cash budget (hwk)
I started, but don't know if I'm going in the right direction: Here is the information on the sheet: Your carpet cleaning entrepreneurship: Supposed that your hometown is Petoskey, Michigan. After college graduation you decided to go into business for yourself because you ...
October 2, 2010 by Claire

chemistry
Why if you dissolve cobalt chloride solution in distilled water and then pour acetone in it, the bottom part of the graduated cylinder is red and the top part is blue? What do you mean by it has one color with water of crystallization? CoCl2*6H2O is a purple solid. I'm told it...
April 11, 2007 by Lydia

Chemistry
I saw that article on Google - that is actually how I got the idea to sublimate the naphthalene. But thank you for the suggestion! It makes me feel much more confident to know that I am on the right track! Thank you! We have a lab where we have to separate five components. The...
February 27, 2007 by Summer

Chemistry
I am still not understanding this one at all. Draw the structure of the reaction product of 2-methyl-1pentene with H2 in the presence of platinum catalyst. This is the exact question it does not say cis or trans. I didn't follow DrBob222's reply, but I thought I had missed a ...
April 3, 2007 by Kellie

nature
hey guys i have hermot crabs that r realy realy realy sick!!!!!!!!! please help them!!!!there not moving there half way out of there shell !!!im scared!!!!!!any help? Thank you for using the Jiskha Homework Help Forum. First of all, where did you get your hermet crabs? If from...
September 13, 2006 by chemiii

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