Which of the following is a weak base? A. KOH (potassium hydroxide)
B. NaOH (sodium hydroxide)
C. NH3 (ammonia)
D. LiOH (lithium hydroxide)

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

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.

What kind of intermolecular forces act between a hydrogen fluoride molecule and a hydrogen peroxide molecule? note: if there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.