PLEASE HELP What are two methods of support used to keep a system operating safely and efficiently

Grade 8 Science

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:

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!

How to calculate the mass of copper