Is activated charcoal mixed with toothpaste a physical or chemical change?

Which of these best describes an ionic bond?

The continuous release of nuclear energy caused when one fission reaction triggered more nuclear reactions is a

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?