Chapter 3 the atom
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Chapter 3: The Atom. Atomic Theory. States that atoms are the building blocks of all matter This idea was developed before scientists could even see atoms !. Law of Definite Proportions.

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Atomic theory
Atomic Theory

  • States that atoms are the building blocks of all matter

  • This idea was developed before scientists could even see atoms!


Law of definite proportions
Law of Definite Proportions

  • States that two samples of a given compound are made of the same elements in exactly the same proportions (ratios) by mass regardless of the size of the sample or source of the compound

  • Each molecule of a compound is made up of the same number and type of atoms


Law of conservation of mass
Law of Conservation of Mass

  • States that matter cannot be created or destroyed during ordinary chemical or physical changes

    • The total mass of a system (reaction) remains the same whether atoms are combined, separated, or rearranged

      Mass of the reactants = mass of the products


Law of multiple proportions
Law of Multiple Proportions

  • If two or more different compounds are composed of the same two elements, the ratio of the masses of the second element is always a ratio of small whole numbers


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