How many grams of ko2 are needed to form 7. 50 g of o2.

One or more substances changing into one or more substances is an example of a

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

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