We did a round the lab trip for density stations this week, the seventh week of school (thus the 6th lab). We saw moth balls in vinegar get raised with air bubbles, saw that hot water is less dense than cold water (with a density ball--a ball with a density very close to 1 g/cc), ranked cylinders from least dense to most dense, and tested antifreeze concentrations. I had students wear safety goggles and aprons, which they don't like that much, but which is much, much safer and better practice for a scientist.
Sweet j.
October 20, 2008
Lab 5--density
Catching up a bit with labs . . .
Lab 5 was a density lab where we computed mass and volume at 8 different stations. It was the first chance to use the new digital scales. It was also the lab where one was stolen. Yikes. Now I only have 7.
Not so sweet j.
Lab 5 was a density lab where we computed mass and volume at 8 different stations. It was the first chance to use the new digital scales. It was also the lab where one was stolen. Yikes. Now I only have 7.
Not so sweet j.
Day 4, 5, 6--Unit 3
Well, where did the time go? How did I get to day 7 already in class, but I haven't blogged days 4, 5, and 6 yet?
I will blame the magazine dance, as well as my wife running the Nike Women's Marathon in San Francisco this weekend. Both kept me off of my game after school, so to speak, the time when I normally devote a bit of time to this blog.
I will also blame the YouTube/Google connection at school which prohibits me (for some reason) from connecting and uploading pictures. I have a video from the O section to post, but cannot get it on. I will persevere.
Day 4 was a bit different for each section. The W, L, and S sections got to see the vacuum pump in action, showing how Boyle's law works. As the pressure around the outside of the marshmellows/peeps/balloons got less, the volume increased. Pressure up, volume down and vice versa.
For the O section, this was dry ice day--finally I was able to put together a system that actually created dry ice (frozen carbon dioxide) in class. I made bubbles with it, put it into acetone, tried to freeze a bouncy ball, and all in all showed how sublimation looked. It is a bit confusing to know that when you see a cloud or fog, you are not seeing a gas, you are seeing the condensation in the air. Tricky.
Sweet justice.
I will blame the magazine dance, as well as my wife running the Nike Women's Marathon in San Francisco this weekend. Both kept me off of my game after school, so to speak, the time when I normally devote a bit of time to this blog.
I will also blame the YouTube/Google connection at school which prohibits me (for some reason) from connecting and uploading pictures. I have a video from the O section to post, but cannot get it on. I will persevere.
Day 4 was a bit different for each section. The W, L, and S sections got to see the vacuum pump in action, showing how Boyle's law works. As the pressure around the outside of the marshmellows/peeps/balloons got less, the volume increased. Pressure up, volume down and vice versa.
For the O section, this was dry ice day--finally I was able to put together a system that actually created dry ice (frozen carbon dioxide) in class. I made bubbles with it, put it into acetone, tried to freeze a bouncy ball, and all in all showed how sublimation looked. It is a bit confusing to know that when you see a cloud or fog, you are not seeing a gas, you are seeing the condensation in the air. Tricky.
Sweet justice.
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