Homework: Behavior of Gases worksheet, chemthink-gases
Most of our class time today was spent reviewing the test, but we did begin our unit on Gases.
Mr. Lieberman conducted a series of demos exhibiting different behaviors of gases. He proved that gases can go directly from the the gas state to solid state. This is called sublimation. He demoed this by heating up a closed flask of iodine and we saw that a purple/pink gas was created.
Gases can also behave like a fluid. Fluids have the characteristics of taking the shape of their container, moving throughout their environments (ex. pipe), they flow, and you can pour them. Mr. Leiberman, exemplified this by setting up two flasks. One with baking soda and vinegar that react to form CO2 and the other, left empty. When a flame was placed in the empty beaker there was no reaction, but when it was placed in the beaker with the baking soda the flame was extinguished. Then Mr. Lieberman poured the CO2 gas in the first beaker into the second one, without pouring any of the baking soda mixture into the second beaker. Then when the flame was placed in the second beaker, the flame was extinguished. This happened because gases can behave like fluids, and the CO2 was poured into the second beaker where it remained and extinguished the flame.
Next scribe: Daniel H.
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