The value of ksp for pbcl2 is 1. 6 ×10-5. What is the lowest concentration of cl-(aq) that would be needed to begin precipitation of pbcl2(s) in 0. 010 m pb(no3)2 ?.

Which two statements are true about a system? 1. a system is a group of objects analyzed as one unit. 2. energy that moves across system boundaries is conserved. 3. there’s only one way to define the boundaries of a system. 4. all systems are made by humans.

What percentage of the earth's water is available for use by living things?

Which scenario describes intraspecific, indirect competition? a. a peacock defends its territory against another peacock. b. lions and hyenas compete for the same prey animals. c. a male black bear eats fish in an area of a lake, so other black bears can’t. d. different species of birds fight over spilled popcorn on the ground.