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Why is direct nucleophilic substitution a poor method for preparing secondary and tertiary amines from primary amines?
A 15 gram piece of iron is heated to a temperature of 47.0 ?C and then placed in contact with a 275 g piece of copper at 20.0 ?C (Cp = 25.46 J/mol-?C). What was the final temperature of the two pieces of metal?
Calculate the heat change of the calorimeter (Qcal) for this process and report it below with the correct number of significant figures
if 860 liters of neon at 45°C and 800 mm. are decreased to 700 liters at the same pressure, what is the new temperature of this gas?
Determine the center temperature of the product afer 60 minutes if the convective heat transfer coefficient between the product and mbient air is 25 W/m^2 K.
Assume that the electrode follows the Nernst equation, the temperature is at 25°C, and that the activity coefficient of X is 1.
Based on the stereochemistry of the addition of bromine to cinnamic acid, write structure of the dibromide product(s) that you think will be formed as the result of the reaction of Z-2-pentene with bromine
how much energy in kilojoules is released when 33.0 rm g of ethanol vapor at 95.0circ rm c is cooled to -19.5circ rm c?
Calculate the pH at the halfway point and at the equivalence point for each of the following titrations. (a) 100.0 mL of 0.42 M HC7H5O2 (Ka= 6.4 multiplied by 10-5) titrated by 0.42 M NaOH halfway point equivalence point
The elements contained in acetylsalicyic acid are hydrogen, carbon, and oxygen. The combustion of 3.000 g of the pure compound yields 1.200 g of water and 3.72 L of dry carbon dioxide, measured at STP
Calculate the pH of the buffer after the addition of 1.5 g of HCl (36.5 g/mol). (Ka of HNO2 = 7.1x10^-4.)
The net charge of a polypeptide at a particular pH can be determined by considering the pKa value of each ionizable group in the protein. For a linear polypeptide composed of 10 amino acids, how many (alpha-carboxyl plus alpha-amino) groups must b..
The rate constant for the first-order conversion of A to B is 3.33hr-1. How much time will be required for the concentration of A to reach 75% of its original value?
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