CHEM 105 Lecture Notes - Lecture 3: The Fuller Brush Girl, Rare Earth Element, The Sceptical Chymist
Document Summary
John dalton and the atomic theory of matter. All matter is composed of extremely small particles called atoms. All atoms of a given element are alike and differ from the atoms of any other element a. If you isolate copper from two different places in the world, they will still be the exact same. Compounds are formed when atoms of different elements combine in fixed proportions a. Co2 and ch4- physical properties are similar but composition is different. A chemical reaction involved the rearrangement of atoms. Wooden balls were used by dalton to demonstrate his atomic theory (they represented the atoms) Much of dalton"s atomic theory has been modified. Dalton assumed that all atoms of an element are alike. He did not understand the existence of isotopes. Isotopes are atoms of the same element with different relative mass. All have the same amount of protons but differ in the number of neutrons.
