Labs 18 -...

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Phase Changes: Does Temperature Rise During a Phase Change? June 30, 2009 Hypothesis During a phase change, the temperature will not change because during a phase change,  the temperature stays the same even though the heat energy changes. Data Time (seconds) Temperature (Celcius) 0 0.4 1 0.4 2 0.4 3 0.4 4 0.4 5 0.7 6 0.9 7 0.7 8 4.1 9 5.5 10 13.6 11 21.5 12 30.2 13 39.0 14 47.5 15 57.5 16 65.1 17 73.9 18 81.6 19 87.7 20 91.3 21 100.3 22 101.7 23 100.7 Questions 1) When the ice is melting, the temperature rises significantly. As the ice is melting,  the water is getting warmer, thus causing the temperature to rise. 2) After the ice melted, the temperature rose because the water got significantly  warmer and started boiling after the ice melted. 3) The temperature definitely rose when the water boiled, but at one point it stopped  because a ll the heat supplied to it will be used to change the state of the water  from liquid to gas (vapor). 4) Using melting and boiling points are relatively easy to measure to identify  substances because they are fixed points and physical constants. In addition, on  graphs, when it is changing state, the temperature would be straight. Also, when 
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evaporating, the liquid would usually bubble. When melting, you will usually see  liquid. 5) A lot of energy was required to vaporize water because it was changing the phase  state. Sweating is an important means of temperature regulation because water  from in the body is evaporating out, thus cooling down the body and preventing it  from overheating. A first marathon runner can die because of heatstroke after  suffering dehydration because he will have lost all the water in his body, thus  making sweating impossible. Without the sweat, he will not have a means to cool  down or have body temperature regulation and will overheat and die.
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Phase Changes: Can Water Boil by Cooling It? June 30, 2009
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Labs 18 -...

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