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No Mac today so I riffed on the bboard. Started stoichiometry but forgot to mention conservation of CHARGE in balancing equations. Start with a single replacement example in solution tomorrow...and a DEMO!!! of Al in Cu2+ solution.
Remind them that , if they ever get lost on the magic triangle, to go back to the basic C12 example!

AP: the two failing students were out today. How convenient. Remind them of bonding mistakes: Zeff has NOTHING to do with ionic bonding; neither do valence electrons.
Give them the W/audit option or they may go to summer school.