What event is foreshadowed by macbeth's aside in this scene

Find the mass in grams of 1.37x1020 particles of h3po4

Drug abuse will not lead to physical and psychological dependence. true or false ?

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.