It seems like everyone has a cell phone these days. sounds, images, and the written word can all instantly be sent using this technology. how do cell phones send information from one person to another? a) sound waves are sent through the air. b) sound waves are sent through overhead cables. c) the signals are sent through underground cables. d) the signals are sent through communication satellites.

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

How many moles are in 1.26*10^24 particles in significant figures

An atom of element x has one more shell of electrons than an atom of beryllium, but it has one less valance electron than beryllium. which element is x