deci-cat experience (ffdoh) wrote in apchemorbust,
deci-cat experience

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Welcome all!

This is the grand opening of the chemistry community. This place is for those of us that want a little more information, help, or just want some interesting tidbits about chemistry to grace our friends page every once in a while, and for those who wish to post questions or comments about the class. In general it will follow the Honors chem course, but i plan to fill in a few holes when necessary, review if people have trouble recalling things, and later in the year we will surge ahead in order to have a winning "concept toolbox"(analogies are not a gift of mine) for those who wish to take the AP test. In any case, all of this has already been addressed in the bio./rules section of the userinfo.

Current stuff: naming compounds is easy stuff so far, doesn't deserve coverage. What does is the "memorization" of radicals. I suggest first considering the oxygen-bearing ions in this task. They all have the exact same rule! Name=(di or hydrogen at the beginning if it contains hydrogen)+(name of element minus last syllable)+(suffix: ite < ate) If you use this, you will not need to memorize any of those ions, because you will be able to deduce the name, and(excluding some exceptions) the charge on these ions is always negative one.

Remember; all sulfur ions have charge of negative two, chlorine ions can contain 1,2,3, or 4 oxygen atoms, which become represented in the name as a prefix hypo- if containing one oxygen(suffix -ite remains) or utilizing the per- prefix seen in oxygen rich ions such as permagnate and peroxide. Also, easy ions to commit to memory are ammonium, NH4, one of the few stable polyatiomic cations, CN, cyanide, which is damn close to being phonetic, and of course OH, hydroxide, commonly seen in EVERY basic(ph > 7)substance. If you use all the things i have went over in this entry, you will ONLY HAVE FOUR MORE Polyatomic ions to remember!!!(maybe six if you count some of the crazy ones that she doesn;t really care about, but are fair game for the AP test)

Before i leave, it's also important that we all can do the problems from the previous chapter and no one is left behind. So, make sure you understand how to do this sample problem (pretty much as hard as basic DA gets, you don't actually have to do it if you know you get it) and if anyone can;t do it, it will be explained so we're all on the same level:

The aluminum in a package containing 75 ft2 of kitchen foil weighs approximately 12 oz. Aluminum has a density of 2.70 g/cm3. What is the approximate thickness of the aluminum foil in millimeters? (1 oz = 28.4 g.)

Keep thinking, guys. The key to this is to not take the notes blindly and ignorantly, but interpret them.
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