Today we partook in a lab on heat, temperature, and phase change. We monitored the temperature of a mixture of rubbing alcohol and water and noticed that, after a while, the temperature in the mixture stayed relatively steady. Even though we were continuing to pump energy (heat) into the mixture, the temperature didn't change. We then took a look at the graph and noticed that the temperature plateaued (stayed constant). We had a brief discussion as to why this may be the case and concluded with the fact that the rubbing alcohol couldn't take any more energy. Basically, at 80 degrees Celcius rubbing alcohol reaches its boiling point. This means that liquid rubbing alcohol can't take any more energy and changes to gas. We also talked about the fact that once the rubbing alcohol boiled away, the temperature would increase as the water heated up. This temperature would also plateau at 100 degrees Celsius as the water changed from liquid to gas. We will discuss this in more detail next week.
Homework for this week is
Read pgs 22 - 25
Do questions #'s 33 - 40
Never Stop Wondering
"Science Jim" Mueller
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