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Sheryl

Questions (131)

After paying a commission of 7 percent of a house to an agent,the owner of the house was left with sh2325000. How much money was
1. 2 answers
2. 278 views
What is a fraction between 0 and 1/2 whose numerator is 20
1. 2 answers
2. 207 views
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
1. 1 answer
2. 956 views
Simplify2+(4+9)-2{18-3[7-(8-6) +1}
1. 1 answer
2. 330 views
Five Boys are pushing a snowball, and each is pushing with a force of 10.0N. However, each boy is pushing in a different
1. 2 answers
2. 7,647 views
All of the following should be considered competitors, with the exception of which one? Existing competitors, Indirect
1. 1 answer
2. 575 views
if the power developed is 290 ft lb/s for 12.8s what is the work done on the system?
1. 1 answer
2. 354 views
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
1. 1 answer
2. 707 views
In Python - A state creates license plates, each containing two letters followed by three digits. The first letter must be a
1. 4 answers
2. 1,202 views
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
1. 0 answers
2. 475 views
How do I solve 6/2x - 1 - 2/2x+1
1. 1 answer
2. 294 views
Create an analysis chart in Word to compare and contrast the various theories on Domestic Violence.The theories suggested are:
1. 0 answers
2. 1,129 views
Describe the difference between intergovernmentalism and supranationalism. Provide useful examples from the European Union,
1. 1 answer
2. 532 views
The reaction 2SO + O2 �¨ 2SO3 is exothermic. (a) How will a rise in temperature affect the yield of SO3 in an equilibrium
1. 1 answer
2. 997 views
Find the mass of 30 mol of sulfuric acid, H2SO4
1. 1 answer
2. 387 views
What become of the electric energy provided in electrolysis? In what device is this energy transformation reversed?
1. 0 answers
2. 396 views
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
1. 1 answer
2. 827 views
Find the mass of 1.6 mol of magnesium, Mg. How many atoms are present in such a sample?
1. 1 answer
2. 659 views
Find the mass of 30 mol of sulfuric acid, H2SO4
1. 1 answer
2. 364 views
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
1. 1 answer
2. 449 views
In an acidic solution, why is the OH- concentration lower than it is in pure water?
1. 1 answer
2. 714 views
You have a solution that contains Ag* ions and another that contains Na* ions. How would adding a solution that contains Cl-
1. 1 answer
2. 503 views
Lithium atoms, like hydrogen atoms, have only a single electron in their outer shells, yet lithium atoms do not join together to
1. 4 answers
2. 2,281 views
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
1. 0 answers
2. 690 views
Would you expect magnesium or calcium to be the more active metal? Explain your answer in terms of atomic structure.
1. 1 answer
2. 487 views
Which of the following substances are homogeneous and which are heterogeneous? Blood, carbon dioxide gas, solid carbon dioxide,
1. 1 answer
2. 1,681 views
Under what circumstances would you expect the shared electron pair to be equal distances on the average from each of the atoms
1. 0 answers
2. 466 views
Why do lithium and sodium exhibit similar chemical behavior?
1. 1 answer
2. 408 views
Why is the Bohr Theory incompatible with the uncertainty principle?
1. 0 answers
2. 577 views
Find the frequency and wavelength of a 50-MeV gamma-ray photon.
1. 0 answers
2. 1,148 views
Why do you think the wave aspect of light was discovered earlier than its particle aspect?
1. 2 answers
2. 467 views
Why do you think the wave aspect of light was discovered earlier than its particle aspect?
1. 2 answers
2. 2,432 views
What kind of experiment might you use to distinguish between a gamma ray of wavelength 10^-11m and an electron whose de Broglie
1. 1 answer
2. 950 views
What kind of experiment might you use to distinguish between a gamma ray of wavelength 10^-11m and an electron whose de Broglie
1. 0 answers
2. 917 views
Why is the Bohr Theory incompatible with the uncertainty principle?
1. 0 answers
2. 483 views
An electron microscope has a much greater useful magnification than an optical microscope because it can resolve smaller
1. 0 answers
2. 488 views
Why can neutrinos travel immense distances through matter whereas other elementaryparticles cannot?
1. 0 answers
2. 618 views
The binding energy of 20 10 Ne is 161 MeV. Find its atomic mass.
1. 0 answers
2. 1,226 views
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.
1. 1 answer
2. 857 views
How does the number of neutrons in a stable nucleus compare with the number of protons? Why is this?
1. 0 answers
2. 390 views
Why can neutrinos travel immense distances through matter whereas other elementary particles cannot?
1. 0 answers
2. 564 views
What fuel other than uranium can be used in a nuclear reactor?Is the answer: Neptunium and plutonium, which are transuranium
1. 0 answers
2. 446 views
I have to give the following feedback to this paragraph: (Evaluative, Interpretive, Supportive, Probing and Understanding). I
1. 11 answers
2. 1,218 views
Read text below. Label 5 sentences with feedback (complete sentences), using these five types of feedback: Evaluative,
1. 2 answers
2. 622 views
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
1. 1 answer
2. 526 views
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
1. 1 answer
2. 728 views
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
1. 2 answers
2. 2,706 views
2/3x+4 + 6/x+2
1. 1 answer
2. 266 views
1. A rectangle has an area of x3 + x2 – 7x + 2 square meters and a width of x – 2 meters. Find its length.
1. 1 answer
2. 1,680 views
I do NOT get this, please help:(11x^2+2x^3+14+17x)/(2x+5)
1. 1 answer
2. 416 views
Skewed distributions were discussed in this week’s readings. Think about some of the psychological studies you are familiar
1. 2 answers
2. 583 views
The following financial data were taken from the annual financial statements of Smith corporation:2007 2008 2009 Current assets
1. 0 answers
2. 907 views
a partial balance sheet and income statement for King Corproation follow:KING CORPORATION Partial Balance Sheet December 31,2009
1. 2 answers
2. 1,084 views
select a topic of interest to you and explain how you would come up with a reliable sample for obtaining peoples' opinions.
1. 3 answers
2. 478 views
Which has a larger radius, the oxygen atom (O) or oxygen ion (O-2) ? Explain.Isn't the ion bigger because negative ions are
1. 1 answer
2. 4,616 views
For the year ending December 31, 2010, Johnson Manufacturing Company had depreciation totaling $38,000 on its office equipment.
1. 1 answer
2. 525 views
How do you factor this completely:x^3 + ax + 3a + 3x^2
1. 2 answers
2. 1,096 views
An audit trail allows an individual to track a transaction from the journal entry to the general ledger through to the financial
1. 0 answers
2. 642 views
Your client is preparing financial statements to show the bank. You know that he has incurred a computer repair expense during
1. 0 answers
2. 668 views
What are the major functions or activities performed by accountants in a private industry?
1. 1 answer
2. 579 views
I'm interested in teaching myself Precalculus and would like to find a good book with lesson plans and assignments. Any ideas?
1. 1 answer
2. 570 views
I did a lab where I had to decompose the compund patassium cholorate (KClO3)by heating,I had to weight the test tube then the
1. 2 answers
2. 1,303 views
I'm going to buy a Bunsen burner to be used with a propane tank. Is it very important to get a propane burner or does the
1. 2 answers
2. 790 views
This is a practical question. I'm working on some raised bed gardens that are very overgrown with tree roots. I've been told to
1. 2 answers
2. 552 views
Is it possible to attach a picture to my question? I've run across a picture of a piece of chemistry equipment and I'd like to
1. 3 answers
2. 542 views
I don't understand how to get a rate determining step. I have an energy diagram for a two-step conversion where the first step
1. 0 answers
2. 684 views
If you knew that you had either cyclohexane or cyclohexene in the lab but weren't sure which, how could you determine which it
1. 0 answers
2. 558 views
Do industrial or other labs often use plastic joint clips to hold distillation flasks and condensers together or do they do as
1. 0 answers
2. 567 views
Question: A mixture of p-nitrophenol and o-nitrophenol can be separated by steam distillation. The o-nitrophenol is steam
1. 2 answers
2. 2,039 views
I isolated eugenol from cloves in the lab using extraction and steam distillation but we did not do infrared.The lab report
1. 0 answers
2. 1,364 views
Question: A substance has a vapor pressure of 50 mmHg at the melting point (100C). Describe how you would experimentally sublime
1. 1 answer
2. 2,148 views
Is there a good tutorial on how to read phase diagrams?Thanks from Sheryl I don't know how good this site is but it has a
1. 0 answers
2. 1,234 views
Question: A solid substance has a vapor pressure of 800 mm Hg at its melting point (80 degrees C). Describe how the solid
1. 0 answers
2. 3,328 views
Why does the boiling point of a two-component mixture rise slowly throughout a simple distillation when the boiling point
1. 0 answers
2. 787 views
I'm having trouble understanding what an azeotrope is. Any clarification is appreciated.Sheryl Two liquids with different
1. 0 answers
2. 643 views
Is there a good tutorial that you know of on Fisher projections? My book isn't helpful.Thanks from Sheryl
1. 0 answers
2. 579 views
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
1. 0 answers
2. 631 views
Question: A sample was placed on a chromatography column. Methylene chloride was used as the eluting solvent. All of the
1. 0 answers
2. 2,568 views
I did a column chromatography on spinach and then a TLC. On the TLC I got five visible bands of colors. On the extracted yellow
1. 0 answers
2. 1,277 views
Question: You are about to purify an impure sample of naphthalene by column chromatography. What solvent should you use to elute
1. 0 answers
2. 2,113 views
Question: A sample was placed on a chromatography column. Methylene chloride was used as the eluting solvent. All of the
1. 1 answer
2. 1,893 views
The question asked is: Using yur results as a guide, comment on the purity of the material in the green and yellow bands. (from
1. 1 answer
2. 1,163 views
Question: What would happen to the Rf values of the pigments if you were to increase the relative concntration of acetone in the
1. 2 answers
2. 4,963 views
We did a column chromatography then a TLC on extracted spinach pigments.Question: Why are the chlorophylls less mobile on column
1. 1 answer
2. 4,742 views
Question: Interactions: Summarize this section (in the book) in your own words and for each interaction give a complete
1. 0 answers
2. 595 views
Is coordination the same as ionic bonding?Sheryl As I understand coordination, as in coordination number, no. It is more
1. 0 answers
2. 648 views
I've done some TLC plates using ethyl acetate with 0.5% glacial acetic acid as a solvent. The structure of these substances
1. 0 answers
2. 1,434 views
What is the product of:CH3COCH3 + Na+NH2- ? Thanks from Sheryl I can't help with this one. Sorry.
1. 0 answers
2. 468 views
What is the electronic configuration of carbide C-4?Thought it was 1s2 2s2 sp2. Thanks from Sheryl C is atomic number 6.
1. 0 answers
2. 6,873 views
Question: A colorless unknown substance is spotted on a TLC plate and developed in the correct solvent. The spots do not appear
1. 1 answer
2. 1,481 views
Question: A colorless unknown substance is spotted on a TLC plate and developed in the correct solvent. The spots do not appear
1. 1 answer
2. 1,978 views
Sugar oxidizes pretty easily, doesn't it? And ketone not as well?Thank you. Sheryl I think that is right. Alcohols go to
1. 0 answers
2. 441 views
Question: A student spots an unknown sample on a TLC plate and develops it in pentane solvent. Only one spot, for which the Rf
1. 1 answer
2. 3,472 views
Question: When a TLC plate ws developed, the solvent front ran off the top of the plate. What should be done to correct the
1. 0 answers
2. 1,163 views
What is the difference between these two questions? They look the same to me, like they're asking the same thing. Not likely.Que
1. 0 answers
2. 1,315 views
Question: Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error.A
1. 1 answer
2. 1,500 views
Question: Consider a sample that is a mixture composed of biphenyl, benzoic acid and benzyl alcohol. The sample is spotted on a
1. 1 answer
2. 3,344 views
Question: Each of the solvents given should effectively separate one of following mixtures by TLC. Match the appropriate solvent
1. 0 answers
2. 1,296 views
Question: You and another student were each given an unknown compound. Both samples contained colorless material. You each used
1. 0 answers
2. 952 views
Question: A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which
1. 4 answers
2. 7,608 views

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