1. Chemistry

    Consider compounds trans-4-tert-butylcyclohexanol and 4-tert-butylcyclohexanone below. Using silica gel TLC plates, which of these two compounds will have the higher Rf value when dichloromethane is the developing solvent? Why? Does it possibly have to do
  2. Chemistry

    Consider the compounds 4-tert-butylcyclohexanol and 4-tert-butylcyclohexanone. Using silica gel plates, which of the two compounds will have the higher Rf value when ethyl acetate is the developing solvent? Which will have the higher Rf value when
  3. Organic Chemistry

    The compounds below are contained in a mixed sample. Rank the compounds in order of elitism if separated using a silica gel column rank them from what elutes first to what elutes last. Benzoic acid, 1,3-dichlorobenzene, tert-butylcyclohexane, and
  4. Chemistry

    Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: a) 2-octanol; b) 1,3-dichlorobenzene; c) tert-butylcyclohexane; d) benzoic acid
  5. Chemistry

    Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: a) 2-octanol; b) 1,3-dichlorobenzene; c) tert-butylcyclohexane; d) benzoic acid
  6. CHemistry

    Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: a) 2-octanol; b) 1,3-dichlorobenzene; c) tert-butylcyclohexane; d) benzoic acid I was wondering if this was the correct order of it: Tert-butylcyclohexane
  7. Chemistry

    suppose you carry out a TLC separation of acetaminophen and phenacetin on silica gel using a non polar developing solvent. which should have a higher Rf value, and why?
  8. Chemistry

    Why use Methyl tert-butyl ether in the organic chemistry lab when separating compounds? separating WHAT compounds and how? as a solvent? It has a low boiling point and isn't very reactive, generally, but there may be other specific reasons depending upon
  9. Chemistry

    A student needs to analyze a mixture containing an alcohol and a ketone by silica gel tlc. Consult the table of solvent polarities above and suggest a likely developing solvent. Explain
  10. Science

    When 2-propanol was used as the developing solvent, two substances moved with the solvent front (Rf = 1) during TLC analysis on a silica gel plate. Can you conclude that they are identical? If not, what additional experiment would you perform?
  11. organic chemistry

    when 2 propanol was used as the developing solvent, two substances moved with the solvent front (Rf=1) during TLC analysis on a silica gel plate. can you conclude that they are identical? if not what additional experiments would you perform?
  12. chemistry

    -Suppose you carry out TLC separation of acetaminophen and ibuprofen on silica ggel using a nonpolaar developing solvent. which should have a higher Rf? -Assuming that the drug components whose spots you identified dissolved completely when you stirred the
  13. Chemistry

    Assume your sample spots are 1 cm above the bottom of the TLC plate. What happens if you put the plate in a developing chamber that has 1.2 cm of developing solvent? A. The solvent will move up the plate by capillary action faster. B. The sample spots will
  14. 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
  15. Chemistry Check

    Just want to make sure that my thought process is right on this one. 5 compounds: n-butyl chloride n-butyl bromide sec-butyl chloride tert-butyl chloride and crotyl chloride Each is reacted with NaI (SN2?) and AgNO3 (SN1?) And we have to rank the reaction
  16. Chem---DrBob222

    -----Chromatograph----- Carrying out TLC on colorless compounds. Give two examples of methods to use in order to visualize the spots on the plates. Carrying out TLC with a mixture of two compounds A and B. A is less polar than B. on a reverse phase plate
  17. 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
  18. science(chem)

    Consider the following errors that could be made when running the TLC. Indicate what should be done to correct the error. a) A 2 component mixture containing 1-octene and 1,4- dimethylbenzene gave only 1 spot with and Rf value of 0.95. The solvent used was
  19. Organic Chem Lab

    If I have separate solutions of the compounds benzoic acid and benzaldehyde, and they are spotted on an alumina gel TLC plate and run using CH2Cl2 as the eluant, which compound will have the higher Rf value? Explain.
  20. 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
  21. Chemistry

    Below is the question I am trying to answer. I think after much debate, I may have it. Does anyone know if I am close to being right? Does cis and trans isomeric compounds display different properties? Why? Cis means on the same side and trans means on the
  22. Chemistry

    Below is the question I am trying to answer. I think after much debate, I may have it. Does anyone know if I am close to being right? Does cis and trans isomeric compounds display different properties? Why? Cis means on the same side and trans means on the
  23. Difference?

    What is the difference between these two questions? They look the same to me, like they're asking the same thing. Not likely. Question: A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which
  24. Chemistry

    Choccamine and mintanol have Rf values of 0.81 and 0.21 respectively. What would the distance in centimetres (cm) between the two compounds be if the TLC was run on a TLC plate where the solvent front moved 8.9 cm from the baseline?
  25. Chemistry

    You carry out tlc on silica gel of a mixture of compound A and B. Using a mobile phase of hexane 50% and acetone 50% the Rf values of were A 0.15, B 0.2, and the spots were overlapping. What change would you make to the solvent composition to improve the
  26. organic chemistry

    How will i know if the r group's common name is tert-pentyl or sec-penytl? What is the difference between sec and tert?
  27. Lab conclusion- HELP!

    I' am currently trying to wrie a couple of lab conclusions and having a hard time coming up with good points to make for the following lab experiment: Thin layer chorotography If anyone has a few minutes to give me a couple tips on how to improve this. I
  28. organic chemistry

    1if you open the tert-butyl chloride and tert-butyl bromide to the air for few hours? What happened to the ratio of the halide mixture during this time? (2-methyl-2-propanol reaction )
  29. science(chem)

    [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 since it can be used to go and determine what exactly is in a sample of mixed compounds which would be qualitative analysis. It can
  30. chemistry

    How can you tell which mobile phase is more polar in TLC? (hexane/ethyl acetate/ethanol vs. isopropanol/ammonia)? the hexane/ethyl acetate/ethanol travelled up the TLC faster, does this make it more polar? The TLC is silica gel!
  31. organic chemistry

    a careless organic chemistry student was performing "competing nucleophiles in nucleophilic substitution reactions" experiment , and left his container of tert-butyl chloride and tert-butyl bromide open to the air for several hours. what happened to the
  32. organic chemistry

    isobutyl tert pentyl acetylene has how many hyrogen atoms? iso=2 butyl=4 tert=4 pentyl=5 acetylene=2 28 h atoms? can you please teach me how to compute hydrogen atoms.. Neoheptane has how many atoms?
  33. Organic Chemistry

    I spotted a commercial TLC plate, coated with silica gel, with a pure benzoin solution. After running the TLC plate in methylene chloride, the benzoin separated into two different spots. Rf values are 0.6 and 0.9. What explains this? A pure material should
  34. chemistry

    What is the order that these four compounds would travel through a silica gel column during liquid chromatography? a) ethylene glycol, HOCH2CH2OH b) aqueous sodium chloride solution, NaCl (aq) c) propanol, CH3CH2CH2OH d) benzene, C6H6 (eluted first), ???,
  35. chemistry

    Suggest a solvent pair for N-Bromosuccinimide using the following solubility data. Solubility of N-Bromosuccinimide (g/100g of solvent) Tert-butanol 0.73 Hexane 0.006 Glacial acetic acid 3.10 Acetone 14.40 Carbon tetrachloride 0.02
  36. 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
  37. Chemistry

    Is it even possible to guess the signs of Delta H, S, and G from only knowing the following information?: - Silica gel is a solid. - Chemically inert. - Highly porous. - Amorphous form of SiO2. - Water vapor is absorbed onto the surface of silica gel and
  38. chemistry

    What is a special group of compounds that produce H+ ions when dissolved in water? A. Acids B. Ionic compounds C. Molecular compounds D. Polyatomic compounds I think A
  39. Science - Chromatography

    I performed a TLC of plant pigments in my lab class with a solvent of petroleum ether/ acetone (7:3) and used a silica gel plate. It is expected that the most polar pigments (chlorophyll) will be located near the bottom and the carotenoids near top. In my
  40. chem

    The Rf value of compound A is .34 when the TLC plate is developed in hexane and .44 when the plate is developed in diethyl ether. Compound B has an Rf value of .42 in hexane and .60 in diethyl ether. Which solvent would be better for seperating a mixture
  41. chemistry

    Consider a set of compounds called carboxylic acids which have the general formula CH3(CH2)nCO2H. As the value of n in the formula increases from zero to 10, what happens to the solubility of these compounds in water? What happens to the compounds
  42. Rf values

    Question: Consider a sample that is a mixture composed of biphenyl, benzoic acid and benzyl alcohol. The sample is spotted on a TLC plate and developed in a dichloromethane-cyclobutane solvent mixture. Predict the relative Rf values for the three
  43. 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.
  44. 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 don't know what else..thanks :) Some organic compounds are non-polar and some
  45. science(chem)

    statement from my text says: "like disolves like", This rule is most commonly applied to polar and nonpolar compounds. According to this rule, a polar solvent will dissolve polar(or ionic) compounds and non polar solven will dissolve nonpolar compounds.
  46. Chem

    Sort the pairs of related compounds by their carbonyl stretching frequencies in cm–1. (There will be three compounds per bin.) Bin # 1: Slightly higher Bin #2: Slightly lower Compounds: -butanol -but-2-enal -heptan-3-one -hept-4-en-3-one -cinnamaldehyde
  47. Dr. Bob please help :)

    Sort the pairs of related compounds by their carbonyl stretching frequencies in cm–1. (There will be three compounds per bin.) Bin # 1: Slightly higher Bin #2: Slightly lower Compounds: -butanol -but-2-enal -heptan-3-one -hept-4-en-3-one -cinnamaldehyde
  48. PLEASE HELP CHEM DR BOB :O

    Sort the pairs of related compounds by their carbonyl stretching frequencies in cm–1. (There will be three compounds per bin.) Bin # 1: Slightly higher Bin #2: Slightly lower Compounds: -butanol -but-2-enal -heptan-3-one -hept-4-en-3-one -cinnamaldehyde
  49. CHemistry....Please help

    1.SOLUBILITY: At 25C, the molar solubility of calcium phosphate in water is 1.1*10^{-7}M. Calculate the solubility in grams per liter. I m not sure how to convert M to g/L MOLAR MASS OF COLLIGATIVE PROPERTIES: 2.tert-Butyl alcohol is a solvent with a Kf of
  50. Organic Chemistry

    The separation of a mixture of benzoic acid and benzoin in dichloromethane into its pure compounds by a combination of solvent extraction , distillation and recrystallization. Why is carbon dioxide evolved when the organic solution is shaken with sodium
  51. Chemistry

    A sample of plant extract is subjected to thin layer chromatography using aluminum backed plates of 0.25 mm thickness. The sample extract is suspected to contain a series of related compounds with hydroxyl and ester functional groups. Suggest a suitable
  52. chemistry

    1. You are given a mixture containing two compounds, A and B. Both compounds have a solubility of 1 g/ 100 mL of solvent at 20 °C and 16 g/ 100 mL of solvent at 100 °C. The sample is composed of 3.5 g of A and 10 g of B. At 100 °C the entire sample just
  53. 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
  54. Chem Help Please!

    You are carryingout TLC on normal phase plates. Compound A has an Rf of 0.4 and compound B of 0.6. What would happen to the Rf values if you increase the polarity of the mobile phase? For the compounds in question 1, you change to running them on reverse
  55. Chem Help Please!

    You are carryingout TLC on normal phase plates. Compound A has an Rf of 0.4 and compound B of 0.6. What would happen to the Rf values if you increase the polarity of the mobile phase? For the compounds in question 1, you change to running them on reverse
  56. Chemistry

    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
  57. chemistry another Q

    Which, 9-fluorenol or 9-fluorenone, would have higher Rf value on a silica gel plate with 30% acetone/70% hexane at the eluent? Explain.
  58. chemistry

    see if on tlc silica if the polar solvent moves slowly then does even polar substances rf value is low? and the nonpolar rf is high?
  59. chemistry

    help please, have no clue how to solve this. (a) you are given a mixture containing two compounds, A and B. both compounds have a solubility of 1g/100mL of solvent at 20 deg C and 16g/100mL of solvent at 100 deg C. The sample is composed of 3.5 g of A and
  60. 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?
  61. Physics

    What kind (s) of particles make up (a) gaseous compounds, (b) liquid compounds, and (c) solid compounds?
  62. Chemistry!!!

    1.)The silica that makes up the stationary phase in TLC chromatophraphy is more polar than the mobile phase. What then might the relative positions of the analgesics on the developed TLC plate tell you about the polarity of these molecules? Does this match
  63. organic chemistry lab pLEASE HELP

    Which, 9-fluorenol or 9-fluorenone, would have higher Rf value on a silica gel place with 30% acetone/70% hexane as the eluent? Explain.
  64. 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
  65. 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
  66. Interactions

    Question: Interactions: Summarize this section (in the book) in your own words and for each interaction give a complete sentence. The strength of interactions of eluted compounds with alumina or silica gel depends on how strongly they are adsorbed to the
  67. Chemistry

    How would you synthesize each of the following? a. 1,2-dibromopropane from propene b. acetone (2-propanone) from an alcohol c. tert-butyl alcohol (2 methyl-2-propanol)from an alkene d. propanoic acid from an alcohol How would you synthesize the following
  68. chemistry

    One afternoon, a graduate student set up a silica gel column to chromatograph a mixture of two colourless products whose Rf values were quite close. Suddenly, he realized that he had tickets to the Leafs game that night. He turned the stopcock to stop
  69. chemistry

    For a TLC lab,the stationary phase is the mixture of isopropanol and ammonia or the mixture of hexane,ethyl acetate and ethanol, the stationary phase is silica gel. text some dyes and drugs. what is the relationship between the polarity of molecules and
  70. science

    Which of the following is NOT true about compounds? A) compounds join in specific ratios according to their masses B) the mass ratio of a specific compound is always the same C) compounds are random combinations of elements D) different mass ratio mean
  71. chemistry

    Which of the following statements concerning differences between ionic and molecular compounds is correct? Molecular compounds contains two elements, and ionic compounds contain three of more elements ionic compounds contain oxygen, and molecular compounds
  72. chemistry

    Which solvent would dissolve each of the following compounds?(water, a polar organic solvent, or a nonpolar organic solvent) a) NaI b) H3CCH2CH2OH C)H3CCH2CH2CH2CH2CH2CH2CH3
  73. chemistry

    ionic componuds tend to have higher boiling points than covalent compounds . both ammonia NH3 and methane CH4 are covalent compounds but yet the boiling point of ammonia 130C is higher than methane. what might account for this difference please help thank
  74. Science

    Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both compounds react with water.
  75. Science

    Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both compounds react with water.
  76. Science

    Plz Correct me!! Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both compounds
  77. Chemistry-Paramagnetic or Diamagnetic

    I did a lab where I was supposed to make "estimates" on transition compounds based on their electron configuration of how the compounds will react positively or negatively and then to experiment the compounds in conjunction with the strong magnets to
  78. chemistry

    In TLC, why do you spot multiple times? Select one or more correct answers. A. To fill the capillary almost instantly by capillary action. B. So the developing chamber solvent does not evaporate. C. The higher compound concentration facilitates
  79. physics

    why do chemical compounds tend to dissolve more quickly in hot solvent than in cold solvent?
  80. gr 12 chemistry

    consider the two compounds, CH3CH2CH2CH2CH2OH and CH3CH2OCH2CH2CH3. Giving reasons for your choice, select the compound that a) will evaporate at a lower temperature b) has higher solubility in a non-polar solvent c) can undergo an addition reaction with
  81. CHEMistry

    A mixture of two compounds, A and B, was separated by extraction. After the compounds were dried, their masses were found to be: 117 mg of compound A and 91 mg of compound B. Both compounds were recrystallized and weighed again. After recrystallization,
  82. Organic Chemistry

    Because alcohol protons are reasonably acidic and easily undergo exchange, it is important that the base be matched to the appropriate solvent. Explain why it would be virtually impossible to sort out the factors the size of the base or the stability of
  83. organic chemistry

    Because alcohol protons are reasonably acidic and easily undergo exchange, it is important that the base be matched to the appropriate solvent. Explain why it would be virtually impossible to sort out the factors the size of the base or the stability of
  84. Chemistry

    Explain why the melting points of ionic compounds and molecular compounds differ? The melting points of ionic compounds and molecular compounds differ because.... -A tremendous amount of energy (heat transfer) is required to separate the tightly bound ions
  85. SCIENCE

    1. Multiple choice: why is it uncommon to draw lewis diagrams for ionic compounds? A.) Lewis diagrams can only illustrate covalent bonding B.) ionic compounds cannot be represented by Lewis diagrams C.) ionic compounds involve electron transfer not
  86. ionic compounds!

    why are ionic compounds abundant in nature? Betty, I don't know how to answer your question. Abundant compared to what? How is abundant defined? I would think there are more covalent compounds in nature than ionic compounds but I may be wrong. Can you
  87. chemistry

    why do different compounds give different retention factors (Rf values) in thin layer chromatography (TLC)
  88. organic chem

    An unknown compound melted at 131-133°C. It is thought to be one of the following compounds(mp,°C): trans-cinnamic acid (133-134); benzamide(128-130); DL-malic acid(131-133); or benzoin(135-137). The mixture melting points of the unknown compound with
  89. chemistry

    three compounds A,B and C all have the formula C5H8. All three compounds will decolorize bromine in CCl4. Compound A reacts with NaNH2. Compounds A and B both yield pentane when they are treated with excess H2 with the pt catalyst. Under the same
  90. chemistry

    Two compounds of molecular formula respectively C2H4O and C4H8O produce a yellow orange precipitate by the reaction DNPH. a)is this indication sufficient to write the structural formulas of these two compounds? Explain. b)what identification tests should
  91. Science

    Why was the tert. Butyl chloride finally washed with water,?
  92. UPNG

    Why was the tert. butyl chloride finally washed with water?
  93. CHemistry

    Why do cis and trans isomeric compounds exhibit different properties?
  94. More spots

    Question: A colorless unknown substance is spotted on a TLC plate and developed in the correct solvent. The spots do not appear when visualization with a UV lamp or iodine vapors is attempted. What could you do to visualize the spots if the compound is the
  95. Science URGENT!!!

    Mulitple choice: why is it uncommon to draw lewis diagrams for ionic compounds? A.) Lewis diagrams can only illustrate covalent bonding B.) ionic compounds cannot be represented by Lewis diagrams C.) ionic compounds involve electron transfer not electron
  96. CHEMISTRY

    In TLC, why do you spot multiple times? Select one or more correct answers. A. To fill the capillary almost instantly by capillary action. B. So the developing chamber solvent does not evaporate. C. The higher compound concentration facilitates
  97. Organic Chemistry Lab

    ISOLATION OF CHLOROPHYLL AND CAROTENOID PIGMENTS FROM SPINACH: What would happen to the Rf values of the pigments if you were to increase the relative concentration of acetone in the developing solvent ? I said the Rf values would be higher because Acetone
  98. chem

    For which element would you expect isotope effects to be of the greatest importance in CHEMICAL processes? a.H b.He c.Li d.B This problem could be interpreted many different ways and come up with different answers, I suppose. In the context of number of
  99. chemistry

    Why do compounds with strong intermolecular attractive forces have higher boiling points than compounds with weak intermolecular attractive forces?
  100. Chemical Compounds

    How can a flow chart help you to name chemical compounds? Some people like to memorize rules and use the analysis of compounds then to apply the rules. CAN YOU HELP ME!!