A flask of ammonia is connected to a flask of an unknown acid HX by a 1.48 m glass tube (where "X" represents a halogen). As the two gases diffuse down the tube, a white ring of NH4X forms 101 cm from the ammonia flask. Identify element X (Name or symbol).

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

What best discribes the relationship between wavelength and frequency in a electromagnetic wave