Tuesday, December 12, 2006
Tuesday 12/12
Honors: we reviewed the structure and formulas of binary ionic compounds (salts). We then discussed polyatomic ions and how to write formulas of ternary compounds, which are salts that are partially or completely made up of polyatomic ions. Do not forget the parentheses rule: e.g. Na2SO4 - no parentheses but Al2(SO4)3 must have parentheses because there is more than one of the polyatomic ions in the "formula unit".
We will cover covalent bonding tomorrow: covalently bond atoms generally form molecules, not "salts".
Regents: these quizzes are taking up some class time but I am seeing how few of you are taking the time to reinforce the class material by studying/re-writing the notes. Today's quiz, even with the advice given SECONDS before the exam resulted in unprecedented low grades (though some dramatically improved). It is absolutely unbelievable to me that, ten seconds after I warned the class to copy the polyatomic ions EXACTLY from the table, some students made the SAME EXACT mistakes that I explicitly warned them NOT to make; the resulting answers were totally wrong. There is no helping those who refuse to be helped. The irony is that, if you are reading this, you probably are doing fine because you care enough to check the site and review what we do in class.
Reminder: if you miss a quiz, the day that you return, you have to make up the quiz after school or you will receive a zero.
AP: we almost finished our elaborate molecular geometry/orbital hybridization chart. Try to write out the chart from scratch until you know all of the electronic and molecular geometries with the accompanying orbital hybridizations. Keep reviewing the videos, also. MOST of the next exam covers the aforementioned info.
We will cover covalent bonding tomorrow: covalently bond atoms generally form molecules, not "salts".
Regents: these quizzes are taking up some class time but I am seeing how few of you are taking the time to reinforce the class material by studying/re-writing the notes. Today's quiz, even with the advice given SECONDS before the exam resulted in unprecedented low grades (though some dramatically improved). It is absolutely unbelievable to me that, ten seconds after I warned the class to copy the polyatomic ions EXACTLY from the table, some students made the SAME EXACT mistakes that I explicitly warned them NOT to make; the resulting answers were totally wrong. There is no helping those who refuse to be helped. The irony is that, if you are reading this, you probably are doing fine because you care enough to check the site and review what we do in class.
Reminder: if you miss a quiz, the day that you return, you have to make up the quiz after school or you will receive a zero.
AP: we almost finished our elaborate molecular geometry/orbital hybridization chart. Try to write out the chart from scratch until you know all of the electronic and molecular geometries with the accompanying orbital hybridizations. Keep reviewing the videos, also. MOST of the next exam covers the aforementioned info.
# posted by C @ 10:18 AM 
