Misc: What chocolate is named after a planet?

Questions

Saturn is the only planet that is less dense than ______?

A bird in the hand is worth two in the?

Schwarzenegger what us state was named after french words for "green" and "mountain"?

Schwarzkopf on what game in 1994 did norman schwarzkopf post the highest score?

Scientific study of old age, emphasizing the social and behavioral aspects of aging?