useless trivia: What Word Means: To Mark Sheep?

Questions

Chemistry : Sodium barcarbonate is better known as ________.?

Chemistry : The process of removing salt from sea water is known as ________.?

Chemistry : The smallest portion of a substance capable of existing independently and retaining its original properties is a(n) __________.?

Chemistry : This ancient attempt to transmute base metals into gold was called ________.?

Chemistry : This is the heaviest naturally occurring element.?