What causes surface water to move

What is the relation between concentration of reactants and the rate of chemical reaction?

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.

Drug abuse will not lead to physical and psychological dependence. true or false ?