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The investigator imagines several likely scenarios that may have led to to the accident. Maybe the driver was intoxicated, fell asleep or was speeding; maybe mechanical failure or bad weather conditions.
CHEMISTRY. Warmup: Survey: How many of the assigned conversions did you attempt? How many did you complete with confidence?
Scientific Method Review.
Lab Assignment: Compare survey results to actual performance on this weekend’s mole conversion problems. Groups formulate a hypothesis, graph data, etc.
Homework: Complete Conclusion and Analysis; plan to present completed lab in class tomorrow. All teams will discuss lab and quality; all will include commentary on our discussions in the final draft analysis due Weds.
PHYSICAL SCIENCE . Warmup: In your own words, explain how heat is transferred in each of the three methods (convection, conduction, radiation) from a fireplace.
Notes: convection, conduction, radiation
Homework: Create a lab: demonstration of convection, conduction, or radiation for the classroom. Groups of 2 – 3 students (assigned). ROUGH DRAFT IS DUE TOMORROW, PLAN TO PRESENT YOUR PROGRESS IN CLASS.
A thermal infrared image of a coffee cup filled with a hot liquid. Notice the rings of color showing heat traveling from the hot liquid through the metal cup. You can see this in the metal spoon as well. This is a good example of conduction.
Conduction is the movement of heat through a substance by the collision of molecules.
At the place where the two objects touch, the faster-moving molecules of the warmer object collide with the slower moving molecules of the cooler object. As they collide, the faster molecules give up some of their energy to the slower molecules. The slower molecules gain more thermal energy and collide with other molecules in the cooler object. This process continues until heat energy from the warmer object spreads throughout the cooler object.
Some substances conduct heat more easily than others. Solids are better conductor than liquids and liquids are better conductor than gases. Metals are very good conductors of heat, while air is very poor conductor of heat.
This thermal infrared image shows hot oil boiling in a pan. The oil is transferring heat out of the pan by convection. Notice the hot (yellow) centers of rising hot oil and the cooler outlines of the sinking oil.
Image courtesy of K.-P. Möllmann and M. Vollmer, University of Applied Sciences Brandenburg/Germany.
A thermal infrared image of the center of our galaxy. This heat from numerous stars and interstellar clouds traveled about 24,000 light years (about 150,000,000,000,000,000 miles!) through space by radiation to reach our infrared telescopes