chemistry of life day 2

We spent a long time today on daily questions in order to make sure you really understand the atomic basis of life.  Here was what i had you do as a warm up.

First I guided you to your notes about protons which mentioned that the atomic # corresponded with the # of protons, so quickly you  should have been able to fill in the number of protons the whole way down 

We then saw that the number of protons equals the number of electrons in a NEUTRAL (no charge) atom.  So you would also put that as the # of electrons on all of these EXCEPT the two ions.  I guided you  at that point to your notes on IONS and you should have found that an atom that has LOST an electron is POSITIVELY charged.  So that means our Sodium Ion (Na+) must have one LESS electron.  An atom that has GAINED an electron is Negatively Charged, so our Chloride Ion (Cl-) must have an extra electron. 

Next we discussed electron shells.  This is were electrons are found.  The first shell can hold 2 electrons, while each shell after can hold 8 each.  Valence electrons are those found in the outer most shell.  The easiest way to go about that is figure out how many electrons are in each shell, and the outer most shell is considered the "valence shell"  notice the smiles next to NA+ and Cl... this is because they are Happy to have 8 electrons in their valence shell.

Finally we moved to the last question.  The answer ended up being a math problem?!?!?!?!  What was I talking about here??? since oxygen has 6 valence electrons and wants 8, it will gladly bond with two hydrogen which each have 1 valence electron so it can be happy with 8 electrons!!!

WHEW!!!!!  That was an intense daily question for sure but laid the ground work for the rest of this VERY important chapter!!!
Today's notes

Now that we went through the daily question this slide should have made MUCH more sense.... and required me to play I need a dollar....... ;) 

So what happens when two ions come in contact.... this love story ends in the formation of salt!!!

I had you listen to the following podcast and we had a nice discussion about electrolytes

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