1.) what is NaF formula

Which statement describes james chadwick’s discovery.

Achemist 16 drop copper metal from copper chloride solution. the chemist place is 0.50 g of aluminum foil in a solution containing 0.75 g of copper (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction?

Can someone me with 6 to 10 plz this is for masteries test.