pk chem 2 - The Greek Concept of Atomos: The Indivisible...

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The Greek Concept of Atomos: The Indivisible Atom All matter is made of tiny indestructible units called atoms. Characteristics of substances are determined by shape of atoms. For example sweet things are made of smooth atoms. No experimental evidence.
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Galileo Did believe in atoms. But thought that atoms were infinitely small like a mathematical point Isaac Newton A more modern perspective of atoms and interatomic forces Lavoisier One of his greatest discovery was law of conservation of mass
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Early chemical laws Law of conservation of mass: Total mass of substances present after a chemical reaction is same as the total mass of substances before the reaction. Law of constant composition: All samples of a compound have same composition- the same proportions by mass of the constituent elements. Law of multiple proportions: If two elements form more than a single compound, the masses of one element combined with a fixed mass of the second are in the ratio of small whole numbers.
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Dalton’s atomic theory 1. Elements are made up of tiny particles called atoms. Atoms can neither be created nor destroyed during a chemical change. 2. All atoms of an element are alike and are different from atoms of other elements.
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pk chem 2 - The Greek Concept of Atomos: The Indivisible...

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