Materials: petri dish universal indicator solution sodium
chloride, NaCl, small amount 9 volt battery electrode wires with alligator
clips (preferable red and black)
1.two pencils sharpened at both ends, or two paper
clips distilled water—take pictures.
2.Fill a petri dish with distilled water.
3.Add a small amount of salt and stir until
dissolved. —take pictures
4.Add enough universal indicator to give a rich
green color —take pictures.
5.Attach each of the wire alligator clips to one
end of each pencil lead. Attach the other ends of the electrodes to the battery
poles, the red wire to the positive pole, the black wire to the negative pole.
Turn the projector on.
6.As electrolysis progresses, color changes will
begin to occur.
7.Place a niobium magnet in the middle and discuss
1.Why is the universal indicator green when you
first add it?
2.Why can we use the pencils to run a charge.
3.What is the color at the cathode?
4.What is the color at the anode?
5.What happens when you place the niobium
6.What is the equation for the electrolysis of
water? Without e and volts
It was an impressive showing at the parent meeting as I ran out of handouts--I made 100 copies. I ran out on the way to M5. Really nice to see M6 parents one more time as they're about to graduate. Gam has returned.
Giving alot of assessment this week with most levels having a quiz.
m5 chem/bio have unit tests
m6 chem has their unit test