Thursday October7, 2010

Mr. Henderson began class by jumping right into page 9 in our packet.
We had already started page 9 yesterday. Page 9 is on names and
formulas of ionic compounds. For example we would be given a formula
such as BaSO4 and we would separate it into cation (Ba2+) and anion
(SO2/4-) as well as writing its name (barium sulfate). When you come
across a formula like SO you can look at the back of your periodic
table given out in class. There you can find what name corresponds
with the symbol and how the mass number and atomic number correspond.
Mr H. reminded us multiple times during our work on page 9 that roman
numerals are only used for transition metals as well as tin and lead.
Next we turned to page 11 in our packets. Page 11 is on names and
formulas of molecular compounds. The class found this page far easier.
The first part focused on greek prefixes. For example we would be
given a formula like CF4 and we would find the name(carbon
tetrafluoride) of the compound. Tetra is used as the prefix because
the number 4 was after the symbol F. The second part of page 11 we
were given a name and had to write the formula. For example we were
given the name phosphorus pentafluoride and had to find the
formula(PF5).
The second half of class was spent in the math computer lab working on
other work such as our notebooks which are due tomorrow(Friday). Class
ended with Mr. H handing back graded work and a current grade report.