Scheme 2 lists a series of 2-methyl-N-heteroaromatics that were tested in this reaction. What is the main difference between the groups of molecules 3a-3d and 3e-3h? Why is it significant that the reaction works about the same with both of these groups of molecules?

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

Compare the equilibrium constants for the systems shown in the table. which favors products the most? which favors products the least? rank these systems in order from most to least in terms of favoring products rather than reactants. d > b > a > c c > a > b > d b > c > d > a a > d > c > b