Chem 403 class 3

Card Set Information

Chem 403 class 3
2010-05-27 14:47:18

Notes from class 3 for exam 1
Show Answers:

  1. What are the columns on the periodic table called?
  2. What are the rows on the periodic table called?
  3. Periods are numbered from
    1 to 7
  4. Groups are identified by numbers
    1 to 8 and letters (A or B)
  5. 8 groups designated as A are called
    the main-group or representative elements
  6. the elements in the B groups are known as
    transition elements
  7. inner transition elements
    are located at the bottom and are part of the transition elements
  8. similar chemical properties (group or period?)
  9. have different chemical properties (group or period?)
  10. Group 1A Alkali Metals
    soft highly reactive metals
  11. Group 2A Alkaline Earths
    Highly reactive metals
  12. Group 7A: Halogens
    Highly reactive nonmetals
  13. Group 8A: Nobel gases
    gases that aren't very reactive
  14. Metals
    good conductors of heat and electricity
  15. Nonmetals
    mostly gases or brittle solids; do not conduct electricity or heat
  16. Metalloids
    semiconductors because they conduct electricity but not as well as most metals
  17. Ionic componds
    generally between metal and a non metal
  18. ion
    is an atom or group of atoms that has a net charge because the # of protons doesn't equal the # of electrons
  19. Cations
    + charged ions
  20. anions
    - charged ions
  21. Group 2A elements (alkaline earths) tend to
    lose 2 electrons and formed cations with a +2 charge
  22. What do atoms like to have the same # of electrons as
    the nearest noble gas
  23. Ionic compounds consist of ............ so the charge is........
    Ionic compounds consist of anions and cations (which are balanced) so the charge is neutral
  24. Covalent bonds ................ electrons and have a charge of ..................
    • Covalent bonds share electrons and have a charge of neutral
    • also want to have hte same number of electrons as the nearest noble gas. This is achieved by sharing.
  25. Polyatomic ions:
    2 or more atoms bounded together to form an ion
  26. Empirical formula:
    shows the relative number of atoms in a compound

    Example: Hydrogen peroxide is HO (1 H for every O)
  27. Molecular formula:
    the actual formula with the correct number of atoms

    Example: for Hydrogen Peroxide it is H2O2
  28. Structural Formula:
    this shows how the atoms are connected to eachother

    Example: hydrogen peroxide is H-O-O-H
  29. Naming Ionic compounds
    Cation first then the anion
  30. Names and formulas of binary covalent compounds. Rules:
    • 1. element in the lower group number comes first
    • 2. If both elements are in the same group, the one with the higher period is named first
    • 3. The 2nd element is named with its root and the suffix "ide"
    • 4. Id more than one atom of an element is present, Greek numerical prefixes are used to indicate how many elements are present
  31. Calculating molar mass if you know the formula of a compound
    add up the atomic masses

    ex. CO2 1x 12.01 (for 1C) + 2x 16.00 (for 2 Os)