9. Razona (en al menos dos líneas) la verdad o falsedad de las
afirmaciones siguientes. (0.5 puntos)
a. Todas las sustancias covalentes están formadas por moléculas.
b. Las moléculas de los metales tienen muchos átomos.
c. Un enlace covalente consiste en un par de electrones
compartido por dos átomos.
d. Un compuesto iónico sólido es un buen conductor de la
corriente eléctrica en cualquier situación.

Achemist at a pharmaceutical company is measuring equilibrium constants for reactions in which drug candidate molecules bind to a protein involved in cancer. the drug molecules bind the protein in a 1: 1 ratio to form a drug-protein complex. the protein concentration in aqueous solution at 25 ˚c is 1.74 x10-6 m . drug a is introduced into the protein solution at an initial concentration of 2.00 x10-6m. drug b is introduced into a separate, identical protein solution at an initial concentration of 2.00 x10-6m. at equilibrium, the drug a-protein solution has an a-protein complex concentration of 1.00 x10-6m, and the drug b solution has a b-protein complex concentration of 1.40 x10-6m.a. calculate the kc value for the a-protein binding reaction.b. calculate the kc value for the b-protein binding reaction.c. assuming that the drug that binds more strongly will be more effective, which drug is the better choice for further research?