PPT-Dalton’s Atomic Theory

Law of Conservation of Mass The total mass of materials after a chemical reaction is the same as the total mass before the reaction Law of Constant Composition The elemental composition of a compound is always the same. 2:. Atomic Theory. and Structure. (. c. 400 B.C.. ) Democritus proposed that “. atomos. ” are . indivisible. .. Atom. : . smallest particle . of matter that . retains its properties. .. Early Models of the Atom. , Austin. Dalton’s Atomic theory. John . D. alton (1766-1844) developed an atomic theory that proposed that atoms were responsible for the combinations of elements found in compounds.. Who was he?. Who first thought of the atom?. Democritus. Leucippus. Democritus and Leucippus. ~440 BC. They were the first philosophers that believed that atoms existed.. They thought that you could cut something in half , over and over, until you eventually get to a particle so small that it can no longer be cut In half.. by . Tiffany, Katelyn, Veronica, . Kole. John Dalton (1766-1844). John Dalton was born into a Quaker Family.. Born: September 6. th. , 1766 in Cumberland, England. He was an English . Meteorologist and then. Atomic Theory Timeline . Scientific knowledge builds on past research and experimentation.. Democritus. 400 B.C.. Information. Atomic Model. Analogy. Democritus, a philosopher in ancient Greece,. . began the search for a description. Principal Source:. Boltzmann’s Atom. David Lindley, The Free Press, . New York 2001. Atom. Greek ‘Uncutable’ . Universe composed of indivisible objects. Philosophy and Atomic Theory. Titus Lucretius . Review for Quiz. Match the Atomic Model to the Person who designed the model.. Use the Models Above . Niels. Bohr. John Dalton. Ernst Rutherford. J.J. Thomson. Niels. Bohr - D. John Dalton - A. Ernst Rutherford - C. I. Foundations of the Atomic Theory. A. 400 B.C. –Democritus. 1. Defined nature’s basic particles as . atoms. a. means indivisible. B. 350 B.C. Aristotle. 1. said matter was made of the 4 “elements”. The atom: from philosophy to scientific theory . 400 BC . – . Democritus. came up with the idea of the . ________. Nature’s . basic particle. ______________. His ideas were not useful in explaining chemical behavior because . Science is based off of observations.. A Scientific Law is a summary of what is seen in observations. . A Scientific Theory is an explanation of why these observations are occurring.. Both laws and theories are tested by using them to predict what would happen in certain situations.. How and why has the Atomic Theory changed over time? . How can we describe the molecular motion of the states of matter? . Objectives. Students will explain that atoms are the smallest unit of an element and are composed of subatomic particles.. How and why has the Atomic Theory changed over time? . How can we describe the molecular motion of the states of matter? . Objectives. Students will explain that atoms are the smallest unit of an element and are composed of subatomic particles.. Dr John Mitchell. ID1004: Approaches to Reality. For Years People Wondered …. What is the World Made of?. What is Matter?. I. s Water Made of the Same Stuff as Rock?. Is Matter Continuous?. Is Matter Continuous?. In your notes…. Draw a model of an atom that best represents each component of that atom.. Foundations of Atomic Theory. Particle Theory of Matter. Democritus in 400 B.C.. Stated that nature’s basic particle was the atom (“indivisible” in Greek). .