CHM110H5- Midterm Exam Guide - Comprehensive Notes for the exam ( 13 pages long!)
Document Summary
Read chapter 3. 1 from your textbook and answer the questions on the worksheet individually. After completing it return the textbooks if you have any questions please ask. Indivisible : although greeks proposed the concept of atom in 300 b. c. , it was reintroduced by john dalton in 1805. Matter is composed of indestructible, indivisible atoms, which are identical for one element, but different from other elements. His theory was successful at that time since it explained the laws of definite and multiple proportions; and also the law of conservation of mass. Discovery of subatomic particles electrons (thompson & milliken), protons (rutherford), and neutrons (chadwick) proved that atom is further broken down into smaller particles. Thompson"s model of atom (1897: also called as the raisin bun model or the plum pudding model, matter is composed of atoms that contain electrons (-ve) embedded in a positive material. The kind of element is determined by the number of electrons in the atom.
