What is it called when particles travel from an area of high consentration to an area of low consentration?

Can someone me with 1 to 4 plz. fast

What happens when the temperature of a solution increases?

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.