7. For the following reaction, which of the following is a conjugate acid-base pair? H2PO4- (aq) + NH3 (aq) HPO42- (aq) + NH4+ (aq)

Each of the following compounds contains a metal that can exhibit more than one ionic charge. provide systematic names for each of these compounds. (a) cr(clo3)6 (b) mo(cn)6 (c) cr2(so3)3 (d) v(clo2)2 (e) v(cn)5 (f) os(clo2)4

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.