Week of 2/29

Monday: Today we went over VSEPR theory using these notes. (Video on VSEPR from last year). The 2nd half of class we went over hybridization, but did not cover sigma and pi bonds yet.  HW: finish molecular modeling lab except for c, d, and k (answers) on the instruction part. Work on textbook problems.

Tuesday: We learned functional groups and learned to name carboxylic acids and alcohols. Here’s the notes + answers for packet worksheets.

Wednesday: Today we started with a review of hybridization and shapes and then I introduced sigma and pi bonding.  Here’s the notes. Then we did the candy modeling and for the last 15 min you worked on the organic modeling lab (answers).

HW: Textbook problems

Thursday: Today we worked on the organic modeling lab. Answers.

Friday: Today I lectured on polarity. I wanted to do the activity in your packet using the phet simulation, but it doesn’t work on macs and the wi-fi was down for all of A block! Ugh. Anwyay, here’s the notes. After notes we finished the molecular modeling lab which gave you more practice on lewis structures for expanded valence, hybridization, formal charge, sigma, pi and determining molecular polarity.  Bobby took pics of the answers.

Week of 2/22

Monday: Today we went over melting point trends for metals and ionic compounds and then learned how to draw Born-Haber cycles and calculate lattice enthalpy using them.  Here’s the notes.

HW: Finish Google Classroom essays, read alloy pages of packet and finish Born-Haber problems in packet.

Tuesday: Complex ion naming and start crystallization lab (make slides which we put away in cupboard under lab bench).

Wednesday: Observe crystals and then review.  I went over some common mistakes in essays and then had some practice questions in a google doc that we did in groups (used the carousel technique – groups answered question on big paper and then rotated to see if anything needed to be added/changed).

Thursday: Test

Friday:  Started with organic naming and then review of Lewis structures + more advanced lewis structures (formal charge and exceptions to the octet rule). Here’s the notes including answers to organic naming.

Videos for today:

Week of Feb 15

Monday: President’s Day Holiday

Tuesday: Snow Day

Wednesday: Review! Spent the first bit talking through PT and Coulomb’s law, then evidence for wave mechanical model. 2nd half of class worked on pages in giant packet.

IMG_2345

Thursday: Test

Friday: Started new packet on ionic and metallic bonding. Went over differences in the 3 types of bonding.  See today’s notes for help.  Also talked about transition metal ions – they lose their 4s first (this is because the 4s energy shell becomes higher in energy than the 3d once you start putting e- in the 3d.  The 3d actually shields the 4s electrons. This is hard to understand if you think of electrons in rings, so you’ll need to remember that the 3d are actually in clover shaped orbitals while the 4s is more like a ring!  The gist, is that the 3d electrons can be closer to the nucleus than the 4s and therefore shield the 4s.  All transition metals have a +2 ion, but often they have more than 1 possible charge because they can also lose d electrons.  After about Mn, the transition metals stop losing d electrons because they are too strongly held to the atom.   We also looked at changes in radius for ions.  Atoms that lose electrons get smaller. Electrons that gain electrons get bigger – this is because of the ratio of protons to electrons.  More electrons to protons means a bigger radius.  When looking at trends in ionic radius it is best to consider an isoelectronic series (a set of atoms that all have the same electron configuration…e.g. compare ionic radius of ions that react to be like Neon).  This way you don’t have to compare what happens when both electrons and protons are changing.  See section 9.2-9.3 in textbook.

HW: google classroom essays.

Week of Feb 8

Monday: Buffer and titration test

Tuesday: no class/ Feb Fest

Wednesday: Finish up Bohr model lab (cuz you all had questions about last 3 questions). Then work on packet through page 21, but did not finish CA 3 b/c it was not very good at explaining why potential energy was negative.  So I lectured on that.

Thursday:  How do we know the Bohr model needs to be refined? Starting with review of PES and then analysis of ionization energy. Padlet link.

Week of Feb 1

Monday: Teacher work day/end of quarter  (last week was off b/c of snowzilla).

Tuesday: Titration curve analysis.  I gave some notes and then had you make titration curves on big paper showing calculations for 4 different points.

Wednesday: Finish titration curve analysis – talked about buffering region and location of equivalence point for weak acid and weak base titrations.   Second half of class I did the indicator demo with blue food coloring. Then gave notes on indicators – the gist is that you need to pick and indicator that has a color change at the same pH as the equivalence point and you can do that by making the pKa of the indicator match the pH of the equivalence point +/- 1.  Then we did the indicator lab where we used all of your buffers to see at which pH indicators would change color.

Thursday: Review for acids/base test part 2. Worked on multiple choice questions, textbook problems and drawing pics for titration curve.  Here’s Bobby’s with some edits by me.   Here is the video I made for you on titration problems.

How to find the pH at various points on a titration curve from Maggie Wiseman on Vimeo.

Week of Jan 18

Monday: Today we work on more pages in the buffer packet (7b packet). Went over more on buffers and I don’t really remember.

Tuesday: Worked on buffer problems.

Wednesday: Today we made buffers.

Thursday – Friday and the next week: Snow days.