To create a molecular model, a student will use blue spheres to represent nitrogen (N) and white spheres to represent hydrogen (H). Which option correctly describes a model of ammonia, NH3?

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

Calculate the concentration of all species in a 0.165 m solution of h2co3.