A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following would correctly represent the result? Justify your choice.
Question
A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following would correctly represent the result? Justify your choice.
Solution
The result would be a graph that initially shows a steady increase in temperature over time as the ice absorbs heat and begins to melt. This is the phase where the ice is turning into water, which occurs at 0 degrees Celsius.
Once all the ice has melted, the temperature will again start to rise until it reaches 100 degrees Celsius, the boiling point of water. At this point, the temperature will again plateau as the water begins to evaporate. This is because the heat energy is being used to break the bonds between the water molecules, turning it into steam, rather than increasing the temperature.
So, the graph would show a steady rise, a plateau at 0 degrees Celsius, another steady rise, and then a second plateau at 100 degrees Celsius. This is due to the phase changes of water, which require energy but do not cause a change in temperature.
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