The quiz on Monday (will be given at the start of lab) will cover all of the material I have lectured on since the start of the semester. Most likely there will be a question or two concerning simple dimensional analysis, such as a finding the mass of a substance given its volume and density, which will require you to use units and pay attention to significant figures. Also, at least half the quiz will cover nomenclature and formulas for salts.
For every quiz from now on, the subject material will be anything that has been covered since the previous quiz. I will avoid asking questions on the quiz about material I have not lectured on. What that means for Monday's quiz is that I will not ask about binary non-metallic compounds, which I did not get to on Friday's lecture. Questions about that material, will be on the next quiz. Also, remember there will be a quiz every Monday unless there is an exam that week.
Common Ions Handout
A list of common ions, charges, formulas, and names that you must memorize (important for Monday's quiz) can be found here and here.
Extra-Credit
Bromine has two naturally occurring isotopes, 79-Br with a mass of 78.9183361 g/mol and 81-Br with a mass of 80.916289 g/mol. Given that the average mass of bromine is 79.9041 g/mol, find the relative natural abundances of the two isotopes. You can simply look up the percentages, but that is not what I am looking for. I want to see your calculation, including a careful observance of units and significant figures. This is worth 4 points, and is due Monday at the start of lecture.
Bromine has two naturally occurring isotopes, 79-Br with a mass of 78.9183361 g/mol and 81-Br with a mass of 80.916289 g/mol. Given that the average mass of bromine is 79.9041 g/mol, find the relative natural abundances of the two isotopes. You can simply look up the percentages, but that is not what I am looking for. I want to see your calculation, including a careful observance of units and significant figures. This is worth 4 points, and is due Monday at the start of lecture.
Lecture Attendance:
On Friday, roughly a quarter of the class left at the break. This was probably not a good idea for those of you who left. I know it was a beautiful day, and a Friday at that, but after the break, I covered a large amount of material on nomenclature which will be on the quiz. While lecture attendance is not required, it is definitely recommended if you want to pass the class with a decent grade. My fear is that those of you left half way through lecture will be the same students who drop in a few weeks because they keep getting low scores.
File-Sharing Website
The file sharing website I have been using to distribute documents to the class seems like it is not reliable, in that the links only work some of the time, and there are low limits to numbers of downloads per day. I am looking for a better one, and am open to suggestions. In the meantime, I will be emailing out all important documents as well as putting them on the file sharing sites.
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