Why is a stirrer used during boiling?

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

Which of the following describes a situation where competition between producers exists

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: