Which of these is a mixture water sugar carbon dioxide popcorn and salt

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?

Wind and moving water provide energy. chemical mechanical thermal none of the above

Ahelium balloon contains 16.9 l of helium at stp. how many atoms of helium are in the balloon