Which of these solutions has the highest freezing point?
a. 1.0 m molecular sucrose (c12h22o11)
b. 1.0 m ionic sodium chloride (nacl)
c. 1.0 m ionic calcium bromide (cabr2)
d. 1.0 m ionic potassium chloride (kci)

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Nonpoint source pollution is difficult to control because it

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.