Tuesday, March 15, 2011

Fun While Grading Quiz 3


Lots of anthropomorphizing of atoms and elements.  It seems oxygen gets real agitated when heated, so don’t mess!

Same question on gas solubility decrease when temp increases

“When water temperature increases, the level of O2 decreases because combustion occurs and O2 is released in this combustion reaction.  If you think about it as the water temp increases the water molecules become more excited and a gas is released.”

“…the molecules of H2O move faster leaving less room for dissolved oxygen between them.”
“When water temperature increases it becomes more difficult for aquatic organisms to get enough oxygen because the oxygen molecules become smaller.”

Something along the lines of “because as temperature increases water begins solidifying…”

I think it was very common for people who weren’t sure to restate the question in the sentence because that’s what they were taught to do since 2nd grade.

Circular logic to explain when you heat water the temperature increases… therefore oxygen decreases

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