4. Which ions act as spectator ions in the reaction below? 2X3Y(aq) + 3AB(aq) → 3X2B(aq) + AzY2(s) a. X1+(aq) and Y3-(aq)
b. A2+ (aq) and Y1-(aq)
C. X1+(aq) and B2-(aq)
d. A2-(aq) and B2 (aq)

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.