CHE-126 Lecture Notes - Lecture 2: Antoine Lavoisier, Phlogiston Theory, Chemical Reaction
Document Summary
Not all atoms are the same; each element is a different type of atom and each element has unique chemical/physical properties: if you add protons to atom it creates a new element. About 90 naturally occurring elements on earth. Must be unseen small particle that cannot be subdivided. Called particles atomos: the point at which matter can no longer be subdivided. Real substances mixtures of different kinds of atoms. ~384 bce, aristotle: all matter is composed of four elements and all matter is continuous, not atomistic. Early 1700s lavoisier: law of conservation of mass: during a chemical change, matter is neither created nor destroyed. Phlogiston: a substance supposed by 18th-century chemists to exist in all combustible bodies, and to be released in combustion. The berzelius experiment illustrates the law of definite proportions. John dalton and the atomic theory of matter. 1803, john dalton: series of experiments where he made combinations of compounds.
