How can you use kinetic energy to complete a step in your contraption such as a rolling ball hitting a lever or switch

What is the number of atoms in 3.54 mol s

Select all that apply. using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 (s) pb+2(aq) + 2cl -(aq). the concentration of the products yield a ksp of 2.1 x 10-2:

What does the symbol (–hfus) indicate in a phase change?