Chemistry Study Guide Test #5

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gerardcb
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38528
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Chemistry Study Guide Test #5
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2010-09-29 20:43:54
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  1. What is an atom?
    Smallest particles of an element that retains the chemical identity of that element
  2. State the Law of Constant Composition
    A given compound will always have the same elements in the same proportions by mass.
  3. State Dalton's Atomic Theory of Matter
    • 1. Each element is composed of small particles called atoms.
    • 2. All atoms of a given element are identical but differ from those any other element.
    • 3. In a chemical reaction, atoms are neither created nor destroyed.
    • 4. A given compound always has the same relative numbers and kinds of atoms.
  4. How many elements are there approximately?
    100
  5. Faraday first suggested a relationship between atoms and _____________.
    Electricity
  6. Where does static electricity come from?
    From electrical charges NOT in motion
  7. A ___________ consists of electrons
    Cathode Ray
  8. Who discovered the electron?
    J.J. Thomson
  9. Who discovered the charge of the electron?
    Millikan
  10. Who discovered radioactivity?
    Berquerel
  11. Who named the core of the atom the nucleus?
    Rutherford
  12. What are the 3 parts of the atom and their charges?
    Proton (+), Neutron (0), Electron (-)
  13. Which part of the atom has the same number as the atomic number?
    Protons
  14. How is the charge of an ion found?
    Number of protons - number of electrons
  15. How is the mass number of an element calculated?
    Number of protons + number of neutrons
  16. What is an ion?
    Atom with unequal number of protons and electrons
  17. What type of force holds protons together?
    Strong nuclear force
  18. What are isotopes?
    Atoms with the same number of protons, but different number of neutrons and atomic mass.
  19. What are the 3 types of radioactive decay?
    Alpha, Beta, Gamma
  20. Which atomic particle has atomic number -1 and mass number 0?
    Beta
  21. Which atomic particle has atomic number 2 and mass number 4?
    Alpha
  22. An alpha particle has atomic number _____ and atomic mass number ______.
    2, 4
  23. A helium nucleus is the same as a(n) _____________ particle.
    Alpha

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