Chem 1011 Chapter 2 Questions With Complete Solutions

Dalton's Atomic Theory correct answer: 1. Each element is composed of atoms 2. all atoms of a given element are identical all same in each individual element but no two elements are the same 3. Atoms can not be recreated by a reaction. Atoms can not be created or destroyed (law of conservation of mass) 4. A given compound always has the same relative number of atoms (law of constant proportions) JJ Thompson correct answer: did a series of plum pudding experiments with cathode ray tubes and discovered electrons Millikan correct answer: Conducted the Oil Drop Experiment which measured (the charge of an electron) and discovered the mass of an electron Marie Curie correct answer: did experiments to discover what caused radioactivity (positive particles from the nucleus) Rutherford correct answer: further studied radioactivity and discovered 3 different types of radiation Gold Foil Experiment he discovered the presence of a centrally located nucleus Atomic Number correct answer: # of protons electrons (Protons and electrons are the same #) bottom # on element Atomic Mass correct answer: = Protons + Neutrons top # on element Isotope correct answer: Atoms with the same atomic # but different atomic mass ex: 12 C and 13 C