Which of the following observations is evidence used to imply that a chemical reaction has occurred? a. gas evolution b. a precipitate forms c. the color changes d. the temperature changes e. the odor changes f. a sound is produced g. change in taste

Why do sodium and neon have vastly different chemical and physical properties despite having similar atomic masses?

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.