Day 29 – Modeling Acids and Bases

Mon. Oct 14, 2013

Chemistry 1 – We continued to work on practice density problems.  We did a variety of small group activities to work though Practice Set 2 in our Unit 1 packet.

2013-10-14 15.20.47

Physics 1 – We worked on matching robot motions.  One robot was programmed using a position vs. time graph, and a second used a velocity vs. time graph.  We began with only one segment of motion that needed to be graphed.   Groups had to figure out that the only way to program using a v vs. t graph was to begin with v=0 and end with v = 0.  Since the robots can’t “get up to speed” in 0 seconds graph segments needed to be draw slightly off of vertical.  Once one segment was matched groups created their own four segment motion and programmed both robots using each graph.  Once confirmed that the motions were identical whiteboards were created depicting both graphs.

2013-10-14 13.44.132013-10-14 13.44.17

Chemistry 2 – On Friday lab groups successfully categorized 7 unknown substances into three groups.  Today I gave the class small whiteboards with the formulas of the 7 substances on them.  The class was asked to recreate the three groups from Friday, but this time by only knowing the formulas (not which substance was which formula).  As you can see above the class successfully created a group of acids, bases, and neutrals.  Only after the groups were created did we use the terms acids and bases.  We then discussed what makes and acid an acid (the H+) and a base a  base (the OH-).  Finally we discussed how H2O fits into this picture.  We talked about how in this instance we could represent water as HOH and that would seem to explain why it is neutral.

 

 

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About bradwysocki

I teach high school Chemistry and Physics using Arizona State University's Modeling Method. The school I teach in is Bloomer HS in Northwest Wisconsin. I've been using the Modeling Method for 7 years now and have just recently begun using Standards Based Grading as a way to assess my students learning.
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