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Estimate the approximate zeff felt by a valence electron
  Shielding of electrons The shielding of electrons gives rise to an effective nuclear charge,Zeff , which explains why boron is larger than oxygen. Estimate the approximate Zeff felt by a …
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The known compounds containing the generic elements x and y
  Suppose there are two known compounds containing the generic elements X and Y. You have a 1.00-g sample of each compound. One sample contains 0.32 g of X and the other contains 0.41 g of X. …
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How many moles of carbon, c were in the original sample
  An unknown compound contains only carbon, hydrogen, and oxygen (CxHyOz). Combustion of 3.50 g of this compound produced 5.13 g of carbon dioxide and 2.10 g of water. How many moles of car …
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Define the solubility of m(oh)2 in a solution buffered at ph
  Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic metal. Estimate the solubility of M(OH)2 in a solution buffered at pH = 7.0, 10.0, 14.0?   …
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Explain that a chemist has cyclohexanone
  Imagine that a chemist has cyclohexanone, triphenylphosphine, butyllithium, and 2-bromobutane. Draw the organic product resulting from using these chemicals in the Wittig reaction.   …
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Find the molecular formula of formic acid
  Formic acid is responsible for the sting you feel when stung by fire ants. By mass, formic acid is 26.10% C, 4.38% H, and 69.52% O. The molar mass of formic acid is 46.02 g/mol. Find the mol …
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Depict the lewis dot structure of cnno2
  Draw the Lewis dot structure of CNNO2 along with all possible resonance structures, labeling formal charges.   …
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Depict a six-carbon alkyne that can exist as diastereomers
  Draw a six-carbon alkyne that can exist as diastereomers. The molecule should contain only carbon and hydrogen atoms.   …
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Compute the molar solubility of nioh2
  A) Calculate the molar solubility of Ni(OH)2 when buffered at pH=8.0 B) Calculate the molar solubility of Ni(OH)2 when buffered at pH=10.0 C) Calculate the molar solubility of Ni(oh)2 when b …
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Explain a structure unambiguously
  The following label was found on a bottle of liquid hydrocarbons in the laboratory of Dr. Ima Turkey following his disappearance under mysterious circumstances. Although the name defines a s …
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Compute the number of molecules in 7.00 moles h2s
  Calculate the number of molecules in 7.00 moles H2S Using Avogadros number calculate the number of molecules in 7.00 moles H2S Calculate the number of moles of Cl atoms in 3.6x10^24 form …
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Calculate the volume of household bleach
  Question- A solution of household bleach contains 5.25% sodium hypochlorite, NaOCl, by mass. Assuming that the density of bleach is the same as water, calculate the volume of household bleac …
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Compute the energy gap between the excited and ground state
  If you put 120 volts of electricity through a pickle, the pickle will smoke and start glowing an orange-yellow color. The light is emitted because the sodium ions in the pickle become excite …
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Explain why is it quantitatively not acceptable to titrate
  Why is it quantitatively not acceptable to titrate each vinegar samples with NaOH titrant to the same dark pink endpoint?   …
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Explain size of an axial substituent always result in higher
  Does increasing the size of an axial substituent always result in higher relative strain energies for the axial conformation   …
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Explain the pkb values for the dibasic base
  The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.8. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.75 M B(aq) with 0.75 M HCl(aq). (b …
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Which is the most acceptable electron dot structure
1. Which is the most acceptable electron dot structure for N2H2?   2. How many lone pairs of electrons are on the Xe atom in XeF6? a. 1 b. 2 c. 0 d. 3 3. Which element, indicated b …
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Explain a reagent bottle on the shelf labeled
A reagent bottle on the shelf labeled 0.5 M NaCl was used in place of the 0.5 M CaCl2. Assuming C2O42- to be in excess, what would be observed as a result of using this reagent in this test   …
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Explain the lewis structure for -ch2cn
The lewis structure for -CH2CN (that should be a superscripted negative sign to the left of the 1st C)   …
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Original concentration
How many half lives will it take the c4h6 to decrease to 3.1% of its original concentration? the relationship of At/ A0= 0.50   …
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