Sheryl

Popular questions and responses by Sheryl
  1. Physics

    Five Boys are pushing a snowball, and each is pushing with a force of 10.0N. However, each boy is pushing in a different direction. They are pushing north, northeast, east, southeast, and south. (Each boy is pushing at an angle of 45.0 degrees relative to

    asked on January 14, 2014
  2. Sublimes?

    Question: An unknown compound gave a melting point of 230C. When the molten liquid solidified, the melting point was redetermined and found to be 131C. Give a possible explanation for this discrepancy. My answer: The compound sublimed. How would

    asked on October 1, 2006
  3. Configuration

    What is the electronic configuration of carbide C-4? Thought it was 1s2 2s2 sp2. Thanks from Sheryl C is atomic number 6. Electronic configuration of the neutral atom is 1s2, 2s2, 2p2. The carbide ion, C^-4, has four more electrons. So the extra four

    asked on October 17, 2006
  4. Mixed melting point

    Question: A compound melting at 134 degrees C was suspected to be either aspirin (mp 135C) or urea (mp 133C) Explain how you could determine whether one of these two suspected compounds was identical to the unknown compound without using any form of

    asked on October 1, 2006
  5. science

    Why do you think the wave aspect of light was discovered earlier than its particle aspect?

    asked on October 9, 2011
  6. 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

    asked on October 13, 2006
  7. Chemistry

    Which has a larger radius, the oxygen atom (O) or oxygen ion (O-2) ? Explain. Isn't the ion bigger because negative ions are bigger than atom's radius. im not sure though.

    asked on October 23, 2010
  8. Phase diagram

    Question: A solid substance has a vapor pressure of 800 mm Hg at its melting point (80 degrees C). Describe how the solid behaves as temperature is raised from room temperature to 80 C while the atmospheric pressure is held constant at 760 mm Hg. I think

    asked on November 12, 2006
  9. Mobility and Rf

    We did a column chromatography then a TLC on extracted spinach pigments. Question: Why are the chlorophylls less mobile on column chromatography and why do they have lower Rf values than the carotenes? My answer: The chlorophylls are more polar than the

    asked on October 22, 2006
  10. 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

    asked on October 14, 2006
  11. Same substances?

    Question: Two substances, A and B, have the same melting point. how can you determine if they are the same without using any form of spectroscopy? Explain in detail. My answer: Perform a mixture melting point. In this procedure, pulverize and mix A and B

    asked on October 1, 2006
  12. science

    When carbon in the form of diamond is burned to produce CO2, more heat is given off than when carbon in the form of graphite is burned. What form of carbon is more stable under ordinary conditions? What bearing does this conclusion have on the origin of

    asked on October 25, 2011
  13. science

    Which of the following substances are homogeneous and which are heterogeneous? Blood, carbon dioxide gas, solid carbon dioxide, rock, steak, iron, rust, concrete, air, oxygen, salt, milk.

    asked on October 17, 2011
  14. Eugenol

    I isolated eugenol from cloves in the lab using extraction and steam distillation but we did not do infrared. The lab report question is: Description of Method. I'm not sure what to put. We prepared the spice, did steam distillation, extracted the

    asked on November 21, 2006
  15. Concentration increase

    Question: What would happen to the Rf values of the pigments if you were to increase the relative concntration of acetone in the developing solvent? Note: The development solvent used was 70% hexane - 30% acetone. My answer: Acetone is more polar than

    asked on October 22, 2006
  16. Global Politics

    Describe the difference between intergovernmentalism and supranationalism. Provide useful examples from the European Union, NATO, and the United Nations.

    asked on November 13, 2011
  17. science

    The reaction 2SO + O2 ¨ 2SO3 is exothermic. (a) How will a rise in temperature affect the yield of SO3 in an equilibrium mixture of the three gases? (b) Will an increase in pressure raise or lower the yield? (c) In what possible way can the speed of the

    asked on October 26, 2011
  18. science

    Find the mass of 1.6 mol of magnesium, Mg. How many atoms are present in such a sample?

    asked on October 25, 2011
  19. Physical Science

    Two tugboats are towing a ship. each exerts a horizontal force of 5 tons and the angle between their tow ropes is 90. what net force is exerted on the ship?

    asked on September 3, 2011
  20. Extraction equations

    We did an extraction. A solid including benzoid acid, p-nitroaniline, and napthalene was dissolved in dichloromethane. HCl was added to give the aqueous salt of p-nitroanaline. NaOH was added to give the aqueous salt of benzoic acid. Napthalene remained.

    asked on October 7, 2006
  21. Filtration

    Problem: In each of the following situations, what type of filtration device would you use? A. Remove powdered decolorizing charcoal from 20mL of solution? My answer: Filter Aid or Celite (diatomaceous earth) B. Collect crystals obtained from crystallizing

    asked on September 30, 2006
  22. Decolorizing

    Question: A compound you have prepared is reported in the literature to have a pale yellow color. When the substance is dissolved in hot solvent to purify it by crystallization, the resulting solution is yellow. Should you use decolorizing charcoal before

    asked on September 27, 2006
  23. Best solvent?

    What is the best solvent for impure fluorene? The possibilities are methyl alcohol, water, and toluene. I'm betting toluene but I don't know its boiling point. Thanks from Sheryl My Merck Index lists 9H-Fluorene as freely soluble in glacial acetic acid and

    asked on September 25, 2006
  24. MSJC

    Simplify 2+(4+9)-2{18-3[7-(8-6) +1}

    asked on February 13, 2016
  25. Chemistry

    a diver swimming at a depth of 10m under the water observes that the size of his air bubbles increase in volume as they rise to the waters surface. which gas law does this relate to?

    asked on November 6, 2015
  26. physics

    Two forces 7N each are inclined at an angle of 120 degree to each other. Find the single force that will replace the given force system

    asked on August 26, 2015
  27. Computers

    In Python - A state creates license plates, each containing two letters followed by three digits. The first letter must be a vowel (A,E,I,O,U), and duplicate letters and digits are allowed. The second letter can be any letter of the alphabet. The state

    asked on April 22, 2013
  28. math

    Melissa earned a score of 75% on her first test. She wants to earn an 85% on her second test. What is the percent increase, rounded to the nearest whole number, from 75% to 85%?

    asked on March 31, 2013
  29. math

    Gary has 10 coins in his pocket. 2 quarters 5 dimes 3 nickels without looking, Gary pulls 1 coin from his pocket and puts it on a table. Then, he pulls one more coin from his pocket. What is the probability that the first coin is a dime and the second coin

    asked on March 31, 2013
  30. Science

    Lithium atoms, like hydrogen atoms, have only a single electron in their outer shells, yet lithium atoms do not join together to form Li2 molecules the way hydrogen atoms form H2 molecules. Instead, lithium is a metal with each atom part of a crystal

    asked on October 22, 2011
  31. science

    Find the frequency and wavelength of a 50-MeV gamma-ray photon.

    asked on October 9, 2011
  32. Algebra 2

    1. A rectangle has an area of x3 + x2 – 7x + 2 square meters and a width of x – 2 meters. Find its length.

    asked on May 30, 2011
  33. MATH

    IF the first term in a geometric sequence is 0 and no other terms are given what is pattern?

    asked on March 31, 2011
  34. math

    Is there a common ratio for the geometric sequence and what are the missing terms? 16,40,100,?,? IS there a common ratio for the geometric sequence and what are the missing terms? 81,54,?,?,?

    asked on March 31, 2011
  35. accounting

    The following financial data were taken from the annual financial statements of Smith corporation: 2007 2008 2009 Current assets $450,000 $400,000 $500,000 Current liabilities $390,000 $300,000 $340,000 Sales $1,450,000 $1,500,000 $1,400,000 Cost of goods

    asked on November 18, 2010
  36. Math 209-College Mathematics II

    How do you factor this completely: x^3 + ax + 3a + 3x^2

    asked on May 29, 2010
  37. Precalculus

    I'm interested in teaching myself Precalculus and would like to find a good book with lesson plans and assignments. Any ideas?

    asked on January 8, 2010
  38. Volatility

    Question: A mixture of p-nitrophenol and o-nitrophenol can be separated by steam distillation. The o-nitrophenol is steam volatile, and the para iosmer is not volatile. Explain. Base your answer on the ability of the isomers to form hydrogen bonds

    asked on November 22, 2006
  39. Subliming a substance

    Question: A substance has a vapor pressure of 50 mmHg at the melting point (100C). Describe how you would experimentally sublime that substance. My answer: I would put the substance in a sidearm test tube apparatus, put ice in the smaller tube and apply

    asked on November 13, 2006
  40. B.P.

    Why does the boiling point of a two-component mixture rise slowly throughout a simple distillation when the boiling point differences are not that large? Thanks from Sheryl

    asked on November 5, 2006
  41. Resonance structures

    I'm trying to figure out some incorrect answers on my last test. I'll try to explain what the original structure looks like and hope you can decipher it. It is a cyclohexane with two double bonds. Carbon # 1 has a double bond to its left and none to its

    asked on October 24, 2006
  42. Solvent

    Question: A sample was placed on a chromatography column. Methylene chloride was used as the eluting solvent. All of the components eluted off the column but no separation was observed. What must have been happening during this experiment:? How would you

    asked on October 23, 2006
  43. Naphthalene

    Question: You are about to purify an impure sample of naphthalene by column chromatography. What solvent should you use to elute the sample? My answer: Naphthalene is very nonpolar so a very nonpolar solvent like hexane should be used.

    asked on October 22, 2006
  44. 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

    asked on October 14, 2006
  45. Solvent temp

    Question: A student dissolved 0.30 g of a crude product in 10.5mL (the minimum amount required) ethanol at 25 degrees C. He cooled the solution in an ice-water bath for 15 minutes and obtained beautiful crystals. He filtered the crystals on a Hirsch funnel

    asked on September 30, 2006
  46. Resonance structures

    I won't try to draw one here but take for example, CH3CH2COO-. This has two resonance structures but they look the same to me. The CH2-C single bond can rotate and it looks like you can just flip the COO- section and it looks like the same structure. Maybe

    asked on September 30, 2006
  47. Filtration?

    Question: While performing a crystallization, you obtain a light tan solution after dissolving your crude product in hot solvent. A decolorizing step is determined to be unnecessary, and there are no solid impurities present. Should you perform a

    asked on September 27, 2006
  48. 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

    asked on September 26, 2006
  49. 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

    asked on September 24, 2006
  50. Business Law

    If two brothers are gifted an undivided one-half each of land-but for 28 years only one brother has paid property taxes planted fruit trees put in a well system cold storage and depends on it to make a living - the other brother has not done anything is

    asked on May 4, 2020
  51. Math

    Mr. Lin baked banana bread for a bake sale to raise money for the math team. He said that he added a spoonful of walnuts for each of the students in his three classes, and that he added more than 250 walnuts. He used the inequality 16w + 24w + 10w > 250 to

    asked on March 9, 2018
  52. math

    It the track is 1/4 mile around and you do 3 laps in 4 and 1/2 min, how many mile per hour do you run?

    asked on May 1, 2016
  53. Chemistry

    i have to round each to 3 significant figures, then to one significant figure, in standard form, how? a) 87.073 m b) 4.3621 x 10^8 m c) 0.01552 m d) 9009 m e) 1.7777 x 10^-3 m f)629.55 m

    asked on September 18, 2015
  54. health

    All of the following should be considered competitors, with the exception of which one? Existing competitors, Indirect competitors, Potential competitors, Direct competitors

    asked on November 10, 2013
  55. Physics

    if the power developed is 290 ft lb/s for 12.8s what is the work done on the system?

    asked on June 23, 2013
  56. Honors Trig

    a plane is flying in the direction of 190 degrees with an air speed of 400 mph. Its course and ground speed are 200 degrees and 350 mph respectively. What is the speed and direction of the wind?

    asked on May 8, 2013
  57. Computer Programming

    I am trying to put the following in Python Code. I know how to do it mathematically, but code - not sure where to start. A state creates license plates that each contain two letters followed by three digits. The first letter must be a vowel ( A, E, I, O, U

    asked on April 21, 2013
  58. math

    Cece scored a 78 on her first math test. She scored an 84 on her second test. What is the percent increase, rounded to the nearest tenth, from Cece's first score to her second score?

    asked on March 31, 2013
  59. Algebra

    How do I solve 6/2x - 1 - 2/2x+1

    asked on October 6, 2012
  60. Criminal Justice

    Create an analysis chart in Word to compare and contrast the various theories on Domestic Violence. The theories suggested are: biological, psychological, sociological, feminist, and patriarchal. I am not sure how to set this up. Thanks

    asked on January 15, 2012
  61. science

    Find the mass of 30 mol of sulfuric acid, H2SO4

    asked on October 26, 2011
  62. science

    What become of the electric energy provided in electrolysis? In what device is this energy transformation reversed?

    asked on October 26, 2011
  63. science

    Find the mass of 30 mol of sulfuric acid, H2SO4

    asked on October 25, 2011
  64. Science

    You are given two solids that look nearly alike, one of which is held together by ionic bonds and the other by van der Waals bonds. How could you tell them apart?

    asked on October 22, 2011
  65. Science

    In an acidic solution, why is the OH- concentration lower than it is in pure water?

    asked on October 22, 2011
  66. Science

    You have a solution that contains Ag* ions and another that contains Na* ions. How would adding a solution that contains Cl- ions to these solutions enable you to tell which is which?

    asked on October 22, 2011
  67. physical science

    The ionization energies of Li, Na, K, Rb, and Cs are respectively 5.4, 5.1, 4.3, 4.2, and 3.9 eV. All are in Group 1 of the periodic table. Explain the decrease in ionization energy with increasing atomic number in this group.

    asked on October 17, 2011
  68. physical science

    Would you expect magnesium or calcium to be the more active metal? Explain your answer in terms of atomic structure.

    asked on October 17, 2011
  69. science

    Under what circumstances would you expect the shared electron pair to be equal distances on the average from each of the atoms participating in a covalent bond?

    asked on October 15, 2011
  70. Science

    Why do lithium and sodium exhibit similar chemical behavior?

    asked on October 15, 2011
  71. science

    Why is the Bohr Theory incompatible with the uncertainty principle?

    asked on October 9, 2011
  72. science

    Why do you think the wave aspect of light was discovered earlier than its particle aspect?

    asked on October 9, 2011
  73. Science

    What kind of experiment might you use to distinguish between a gamma ray of wavelength 10^-11m and an electron whose de Broglie wavelength is also 10^-11m?

    asked on October 9, 2011
  74. Science

    What kind of experiment might you use to distinguish between a gamma ray of wavelength 10^-11m and an electron whose de Broglie wavelength is also 10^-11m?

    asked on October 9, 2011
  75. Science

    Why is the Bohr Theory incompatible with the uncertainty principle?

    asked on October 9, 2011
  76. Science

    An electron microscope has a much greater useful magnification than an optical microscope because it can resolve smaller details. What makes the higher resolving power possible?

    asked on October 9, 2011
  77. science

    Why can neutrinos travel immense distances through matter whereas other elementary particles cannot?

    asked on October 2, 2011
  78. Science

    The binding energy of 20 10 Ne is 161 MeV. Find its atomic mass.

    asked on October 2, 2011
  79. science

    Find the Kinetic energy (in keV) of 12 6 C atom of mass 12.0 u whose speed is 2 x 10^6 m/s.

    asked on October 1, 2011
  80. science

    How does the number of neutrons in a stable nucleus compare with the number of protons? Why is this?

    asked on October 1, 2011
  81. science

    Why can neutrinos travel immense distances through matter whereas other elementary particles cannot?

    asked on October 1, 2011
  82. science

    What fuel other than uranium can be used in a nuclear reactor? Is the answer: Neptunium and plutonium, which are transuranium elements.

    asked on October 1, 2011
  83. english

    I have to give the following feedback to this paragraph: (Evaluative, Interpretive, Supportive, Probing and Understanding). I don't know how to start or if I have to use all the 5 types of feedback. This is the paragraph I have to read and give feedback

    asked on October 1, 2011
  84. english

    Read text below. Label 5 sentences with feedback (complete sentences), using these five types of feedback: Evaluative, Interpretive, Supportive, Probing, Understanding. The fear of using computers stems from several reasons. Most people don’t understand

    asked on October 1, 2011
  85. science

    Solve both equations for v. Kinematic: v=v0+at Energy: 1/2mv^2=mgh I have the height and time: Hgt: 2ft Time in second: 0.3 How do I find Velocity(v) in m/s(kinematic) and Velocity(v) in ft/s (energy)? I'm not sure where to start.

    asked on September 14, 2011
  86. Physical Science

    The brakes of a care are applied to give it an acceleration of -3m/s^2. The car comes to a stop in 5 s. What was its speed when the brakes were applied?

    asked on September 3, 2011
  87. adding rational expressions

    2/3x+4 + 6/x+2

    asked on May 30, 2011
  88. Dividing Polynomials

    I do NOT get this, please help: (11x^2+2x^3+14+17x)/(2x+5)

    asked on May 30, 2011
  89. math

    how dO find the missing terms for the geometric sequence o,?, ?, ?...... 16, 40, 100......

    asked on March 31, 2011
  90. MATH

    PLEASE EXPLAIN HOW TO FIND THE COMMON RATIO FOR THE GEOMETRIC SEQUENCE 16, 40. 100,____, ____ AND 81,54, ______,______,______

    asked on March 31, 2011
  91. english

    what is an verb adverb, action verb and how to use in a sentence

    asked on March 22, 2011
  92. Stats

    Skewed distributions were discussed in this week’s readings. Think about some of the psychological studies you are familiar with and the constructs investigated in those studies. Describe the study you are referring to and give some examples of the

    asked on February 18, 2011
  93. accounting

    a partial balance sheet and income statement for King Corproation follow: KING CORPORATION Partial Balance Sheet December 31,2009 Assets Current assets: Cash $33,493 Marketable securities $215,147 Trade receivables, less allowance of $6,000 $255,000

    asked on November 18, 2010
  94. basic critical thinking

    select a topic of interest to you and explain how you would come up with a reliable sample for obtaining peoples' opinions.

    asked on November 18, 2010
  95. math

    Describe the steps you would use to add 57+29 on a hundred chart. Tell how to use the rows to find the sum.

    asked on October 13, 2010
  96. accounting

    For the year ending December 31, 2010, Johnson Manufacturing Company had depreciation totaling $38,000 on its office equipment. Give the journal entry to record the adjusting entry.

    asked on June 26, 2010
  97. 4th grade

    Is it grammatically correct to begin a sentence with "what" if it is not a question or exclamation? For example: What a tree looks like.

    asked on May 16, 2010
  98. College Accounting

    An audit trail allows an individual to track a transaction from the journal entry to the general ledger through to the financial statements. The audit trail can also find all the transactions that comprise the dollar amount for each account listed on the

    asked on February 14, 2010
  99. College Accounting

    Your client is preparing financial statements to show the bank. You know that he has incurred a computer repair expense during the month, but you see no such expense on the books. When you question the client, he tells you that he has not received the

    asked on February 14, 2010
  100. College accounting

    What are the major functions or activities performed by accountants in a private industry?

    asked on February 4, 2010

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