The reaction between copper and sulfur is represented by the chemical equation shown below. What is the theoretical mass in grams of Cu2S, 159.16g/mol, formed from 4.28 moles of copper? report in three significant figures. 2 Cu + S -> Cu2S​

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.

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.