'Whole number ratios' presentation slideshows

Atomic Structure. Mass Number. Actual masses of atoms are frustrating to work with.Therefore we use relative comparisons of the masses of atoms. We use the atomic mass unit (amu) which is one-twelfth the mass of a carbon atom that contains six protons and six neutrons.

Chapter 4. Atoms and their structure. History of the atom. Not the history of atom, but the idea of the atom. Original idea Ancient Greece (400 B.C.) Democritus and Leucippus- Greek philosophers. History of Atom. Smallest possible piece? Atomos - not to be cut. Looked at beach

History of Atom Flip Book. The atom Picture, parts including charge and location Chadwick Discovered the… Rutherford Gold Foil Experiment JJ Thomson Cathode Ray Tube Millikan Oil Drop experiment Dalton Dalton’s Atomic Theory Democritus His 5 ideas Aristotle

Atoms and Elements Chapter 4. Tro, 2 nd ed. ELEMENTS AND ATOMS. All known substances on Earth and probably the universe are formed by combinations of more than 100 elements.

Regents Chemistry. Tyna L. Meeks. 1. Introduction. This course will be following these guidelines: Organized by related techniques, called a spiral curriculum 15 Unit exams

Regents Chemistry. Tyna L. Meeks. 1. Introduction. This course will be following these guidelines: Organized by related techniques, called a spiral curriculum 15 Unit exams

Early Early Atomic ideas. 400 BC, Democritus – said world was made up of two things air and a basic particle called an atom. Atom was the smallest piece of matter and could not be broken down further. Not supported by experimental evidence

Law of Definite Composition and Law of Multiple Proportions. Chemistry Mrs. Coyle. Joseph Proust (France 1799). Law of Definite Proportions: A given compound always contains elements in a certain proportion by mass. (Constant composition).

Chapter 5: Atomic Structure. Early Models of Atoms. Democritus (460-400B.C.) first suggested the existence of these particles, which he called “atoms” for the Greek word for “uncuttable”. They lacked experimental support due to the lack of scientific testing at the time.

Atomic Theories- Part I. Chemistry Mrs. Coyle. A) Early Atomic Theories. Atom. The word atom comes from the Greek and means “indivisible”. Atom. The smallest particle in an element that retains its identity in a chemical reaction. Democritus – Greek philosopher 4 th Century BC.

History of the atom. Atoms (created by the Big Bang) are the smallest unit that makes up matter . Atoms. All life, whether in the form of trees, whales, mushrooms, bacteria or amoebas , consists

CHEMICAL REACTIONS. SAVE PAPER AND INK!!! When you print out the notes on PowerPoint, print "Handouts" instead of "Slides" in the print setup. Also, turn off the backgrounds (Tools>Options>Print>UNcheck "Background Printing")!.

To Understand The Atom Is To Understand Chemistry: Mileposts on the road to the atom. All matter is made from elements What makes elements unique? A component unique to each element A common component but assembled in a different way. Learning Objectives. Describe what is meant by “atom”

Review from Thursday:. What is a mole?. Chemical Quantities. Chemical Quantities. Chemical formulas give essential information about the exact ratio of atoms that form a substance. Ex. CO 2 - carbon dioxide contains a 1:2 ratio of carbon to oxygen atoms.

CHEMICAL REACTIONS. Chem I: Chapter 6 Chem IH: Chapter 11. Reactants: Zn + I 2. Product: Zn I 2. Chemical Reactions… . occur when bonds between valence electrons of atoms are formed or broken involve changes in matter, the making of new materials with new properties & energy changes.

~400 B. C. Ancient Greece. Democritus: . “All matter is made of tiny, unbreakable particles; atomos ”. Aristotle: “All matter is made of 4 elements; earth, air, fire and water”. Aristotelian viewpoint triumphs for 2000 years…. 2000 years later….

Chapter 2. Ancient Greek and Roman concepts of Nature. 1. Continuists – Aristotle. 2. Atomists – Leucippus, Democritus & Lucretious. Dark & Middle Ages – Little change. Late Middle Ages – Reformation & Renaissance Beginnings of Modern Science – Experimentation and questioning.

Chapter 3 “ Atomic Structure”. or, “How did we get here from there?”. Sept. 2006. OBJECTIVES. Define the term “atom.” Review the early history of Atomic Theory. List the postulates of Dalton’s Atomic Theory. “A Brief History of Chemistry” by Mr. Matt Davis & Dr. Tom Witherup.

Dalton. Thomson. Schrodinger. Bohr. Rutherford. John Dalton. John Dalton. All elements are composed of atoms Atoms are indivisible Atoms of a given element are identical Compounds are composed of a combination of elements. The combination of elements in a given compound are identical

Molar Mass and Formulas. Chapter 3 (sections 3.1-3.5). What is a mole?. A mole is used to represent the quantity 6.02 x 10 23 . It can be used to represent that amount of ANYTHING: -atoms -molecules -ions -compounds -particles -items (ex: students, homework assignments).