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Atomic nucleus

Bob Jones PPT Notes -- Chapter 4a

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The Development of Atomic Models: A Historical Perspective 1 Model of an Atom An IDEA of what it looks like (a working representation) 2 Atomic Models Democritus? Idea An object CANNOT be divided indefinitely. There is a smallest particle. atom: (Gk. atomos?indivisible) 3 Democritus ? Chemistry textbook p. 73 (BJU Press) Atomic Models There is a basic unit of matter?the atom. Chemists found this out by looking at the mass ratio of substances. But the atom is NOT indivisible. Democritus? Idea was CORRECT! 4 Democritus ? Chemistry textbook p. 73 (BJU Press) Continuous: Matter can be subdivided forever. Particulate: A smallest particle exists. 2 Theories Atomic Models 9 grams of H2O: 8 grams of oxygen 1 gram of hydrogen Ratio is 8:1 Mass Ratio 90 grams of H2O:

Chem Scientists and Definitions

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Democritus Greek; said that everything in the universe starts with small pieces of un-cuttable (atomos) pieces of matter but had no proof ? Aristotle Greek; said there was no such thing as the smallest piece of matter; he was the good speaker therefore people of his time believed him John Dalton created the Atomic Theory in the 1800's The Atomic Theory says that all things in the world are made of atoms, and if the materials are the same, the atoms are identical especially in their mass; different elements have different atoms and a chemical reaction is a rearrangement of atoms William Crookes

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Question 1?(Worth 1 points) [02.01]Which of the following is essential for a theory to become widely accepted within the scientific community? ?A theory must include a valid scientific model. ?A theory must be supported by many different experiments. ?A theory is an educated guess based on multiple observations. ?A theory must change over time regardless of the scientific data. Points earned on this question: 1 Question 2?(Worth 1 points) [02.01]Which of the following is the?best?definition of a scientific model? ?any visual representation of scientific experimental findings ?a 3-d object used to demonstrate key scientific theories and data ?a visual, verbal, or mathematical explanation of experimental data ?an explanation of any scientific idea, theory, or experimental results

Chemistry Chapter 4,25

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Lecture 2 (Chapter 4 & 25) Atomic Structure Democritus (400 BC) ? Postulated there must be some basic unit of matter that could not be divided any further. ? Basic unit ? atomos (Greek = indivisible) Dalton Dalton?s Atomic Theory ? All matter is composed of extremely small particles called atoms ? All atoms of a given element are identical having the ame size, mass and chemical properties. Atoms of a specific element are different from those of any other element ? Different atoms combined in simple whole number ratios to form compounds ? Ina chemical reaction, atoms are separated, combined, or rearranged ? Atoms cannot be created, divided into smaller particles or destroyed. Scientist and Experiments Cathode Ray Tube Experiments ? Plum pudding model ?
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