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22 Cards in this Set
- Front
- Back
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Law of Conservation of Mass
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Mass is neither created nor destroyed during ordinary chemical reactions or physical changes
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Law of Definite Proportions
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A chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound
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Law of Multiple Proportions
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If two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers
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Protons
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Positive, subatomic particle located in the nucleus
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Neutrons
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No charge, subatomic particle located in the nucleus
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Electrons
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Negative charge, subatomic particle found outside of the nucleus
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Atomic Mass Unit (amu)
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A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon 12, which is assigned a mass of 12.
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JJ Thomson
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He discovered the electron in 1897 using Cathode Ray Tubes
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Ernest Rutherford
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He and others used the Gold Foil experiment to obtain detail of the atoms structure. The results of their gold foil experiment led to the discovery of a very densely packed bundle of matter with a positive electric charge. They called it the nucleus.
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James Chadwick
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He discovered the neutrons in the nucleus. Invented a new model of the atom.
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Nuclear Model of the Atom
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Bohr Model?
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Dalton's Atomic Theory
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All matter is composed of extremely small particles called atoms(1808). Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. Atoms cannot be subdivided, created, or destroyed.
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Modern Atomic Theory
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A theory of the nature of matter, which states that matter is composed of discrete units called atoms, as opposed to the obsolete notion that matter could be divided into any arbitrarily small quantity.
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Nuclide
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An atomic nucleus characterized by its specific constitution, i.e., by its number of protons, its number of neutrons, and its energy content.
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Atomic Number
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The number of protons in an atom
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Mass Number
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The total number of protons and neutrons in an atomic nucleus.
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Isotopes
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The same atom of an element, but with a different number of neutrons.
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Ions
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An ion is an atom or molecule where the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge
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Average Atomic Mass
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The ratio of the average mass of atoms of an element.
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Mole
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A unit of amount of substance
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Avogadro's Number
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6.02 times 10 to the 23
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Molar Mass- Gram Formula Mass
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The mass of one mole of a substance
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