Calculate the mass percent of each component in the following solution. 159 g NiCl2 in 500 g water
% Nicla
% water

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.

Most metamorphosis processes take place

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold