Please write a lab report on physical and chemical changes, please

After cloud droplets form, what must happen to them for precipitation to occur?

What is the mass of each element in a 324.8 sample of co2

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.