Photons are emitted as electrons in the atom jump up in energy. true or false?

Iknow #2 is d. i just need to know why

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

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?