chem definitions

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  1. element
    a substance that cannot be decomposed into simpler substances by chemical means
  2. compund
    a substance of 2 or more combined elements in a fixed proportion
  3. atom
    smallest particle of an element
  4. molecule
    smallest particle of a compund (covalently bonded)
  5. ion
    chrged particle
  6. electron
    negative subatomic particle, mass=0 charge -1, orbits nucleus
  7. proton
    positive subatomic particle , mass=1 charge 0, found in the nucleus
  8. nucleus
    central part of atom where mass of atom occurs
  9. energy level
    a region of the atom around the nucleus of specific energy in which electrons are found
  10. periodic table
    arrangment of elements in order of increasing atomic #
  11. metal
    element with distinctive properties on LHS of periodic table
  12. non metals
    elements with different properties than metals (insulators) RHS
  13. metalloids
    elements with metallic and non metallic properties
  14. noble gas
    group 18 of periodic table COT unreactive gases
  15. atomic mass
    mass of the atom
  16. atomic #
    # of protons in an atom
  17. bonding
    atoms bond together chemically involving electrons
  18. ionic bonding
    bonding by transfer of electrons
  19. covalent bonding
    bonding by sharing of electrons
  20. hydrogen bonding
    dipole interaction between molecules containing hydrogen and a small highly electronegative atom
  21. reaction
    chemical interaction between substances
  22. acid
    produces H+ ions
  23. pH
    measure of acidity
  24. base
    produces OH -1 ions
  25. soluble
  26. insoluble
    does not dissolve
  27. solute
    that which dissolves
  28. solvent
    the dissolving medium
  29. solution
    the result that occurs when a solute dissolves in a solvent
  30. scientific method
    • 1.question,observe,hypothesis,expirement,conclusion
    • 2.theory
    • 3.further expirements
Card Set:
chem definitions
2012-01-11 23:17:24

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