Ch.3 Chem

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8thgradeclass
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290832
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Ch.3 Chem
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2014-12-06 20:52:56
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  1. States that mass neither created nor destroyed during ordinary chemical reactions or physical changes.
    Law of Conservation of Mass
  2. States that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample pr source of the compound
    Law of Definite Proportions
  3. States 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.
    Law of Multiple Proportions
  4. What are the five key points in Dalton's atomic theory?
    • 1. All matter is composed of atoms.
    • 2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in those properties.
    • 3. Atoms cannot be subdivided, created, or destroyed.
    • 4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
    • 5. In chemical reactions, atoms are combined, separated, or rearranged.
  5. The smallest particle of an element that retains the chemical properties of that element.
    atom
  6. a very small region located in the center of an atom
    nucleus
  7. A nucleus is made up of at least one ____ and one or more _____.
    protons and neutrons
  8. Supplied evidence of the existence of electrons
    Cathode- Ray Tubes
  9. Negatively charged subatomic particles that have relatively little mass
    electrons
  10. Found evidence for the existence of the atomic nucleus by bombarding gold foil with a beam of positively charged particles
    Rutherford
  11. Equal to the number of protons of an atom of that element
    atomic number
  12. Equal to the total number of protons and neutrons that make up the nucleus of an atom of that element.
    mass number
  13. protons equal ____
    electrons
  14. Atoms of the same element with different masses
    isotopes
  15. a general term for a specific isotope of an element
    nuclide
  16. short-range proton-neutron, proton-proton, and neutron-neutron forces hold the nuclear particles together and are referred to as ___ ____.
    Nuclear Forced

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