NSCI 310 Homework 6 Due 2/15/07 Describe your observations for your chemical reactions experiments. Discuss what happened during your chemical reactions.

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NSCI 310 Homework 6 Due 2/15/07 Describe your observations for your chemical reactions experiments. Discuss what happened during your chemical reactions using the terms introduced for heat in class. Convert your temperatures to Fahrenheit.

Rattlebacks: Disequilibrium Ch. 2 p. 34

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The reasoning--though incomplete--is based on the Bernoulli effect, which correctly correlates the increased speed with which air moves over a surface and the lowered air pressure measured at that surface. In fact, most airplane wings do have considerably more curvature on the top than the bottom, lending credence to this explanation. But, even as a child, I found that it presented me with a puzzle: how can a plane fly inverted (upside down). When I pressed my 6th grade science teacher on this question, he just got mad, denied that planes could fly inverted and tried to continue his lecture. I was very frustrated and argued until he said, "Shut up, Raskin!"

Here's what happened: he sent me to the principal's office when I came in the next day with a balsa model plane with dead flat wings. It would fly with either side up depending on how an aluminum foil elevator adjustment was set. I used it to demonstrate that the explanation the class had been given must have been wrong, somehow. The principal, however, was informed that my offense was "flying paper airplanes in class" as though done with disruptive intent. After being warned that I was to improve my behavior, I went to my beloved math teacher who suggested that I go to the library to find out how airplanes fly--only to discover that all the books agreed with my science teacher!

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Chemical Reactions and Heat A. A chemical reaction the gives off heat to its surroundings is exothermic. B. A chemical reaction the takes heat from its surroundings is endothermic.

Chemical Reactions A. Stir your solution and wait for it to come to equilibrium before recording the “before” temperature. Why? B. Take your “after” temperature reading as soon after adding and stirring the ingredients as is reasonable. Don’t hold the base of your cup while stirring! Why? C. Stir your solution while you are waiting 3 minutes to be sure everything has a chance to react. Record your “ending” temperature after 3 minutes.