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1.Which is the electrophilic site in the following compounds.
A. CH3Cl B.H3C-O-CH3 with two lone pairs around O C. BH3
2.What is the nucleophilic site in each of the following molecules.
A.H3C-O-CH3 with two lone pairs around O B. H2N-CH3 with a lone pair around N C. H2C double bonded to CH2.
Cesium-131 is a short lived radioisotope (t1/2= 9.7 days) used to treat prostate cancer. How much theraputic strength does a Cesium-131 source lose over 60 days? Express your answer as a percent of the strength the source had at the begining of th..
The half-life of C-14 is 5730 years. A fossil was analyzed and determined to have a carbon-14 level that is 50.0 % that of living organisms. How old is the fossil?
Imagine that a chemist has cyclohexanone, triphenylphosphine, butyllithium, and 2-bromobutane. Draw the organic product resulting
7.41g of O2 are combined with 5.23g NH3 , and the reaction proceeds. What mass of NO is produced?
The Party Guy, Mr. Balloon, is making animal figures out of long thin balloons that he twists into different shapes. Assume that the balloons are of uniform thickness.
A 20 mg sample of zinc is heated at 10 K min-1, and the peak on the DSC trace has an area of 0.371 W K. Calculate the latent heat of melting of zinc (in kJ mol-1)?
Draw the Lewis Structure for a Nitrate Ion (NO3-1). Assign the formal charge for the central atom, Nitrogen. What is that formal charge
What is the new boiling point of water if you add 188 grams of magnesium chloride to 1250 g of water.
Butadiene, C4H6(used to make synthetic rubber and latex paints) dimerizes to C8H12 with a rate law of rate=0.038L/(mol*s)[C4H6]^2. What will be the concentration of C4H6 after 2.0 hours if the initial concentration is 0.044M?
suppose a can contains gas at a pressure of 755 mm Hg and a temperature of 25 degrees celsius, what would be the pressure if the can was heated to 1155 degrees celsius ?
For the analyte with pka= 5.6 and 60/40 acetonitrile/water eluent composition what should be the pH of an aqueous portion of the mobile phase to ensure complete ionization
Assuming the multiple internal reflections depicted below, what is the effective path length (um) for measurements in which the sample completely covers the crystal's upper face?
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