2. Observing Phase Changes One effect of heat transferring into a material is that the phase changes. What happens to the temperature of the material during this phase change? Three students are discussing what is happens when ice melts. Tony: "We know heat is coming into the ice, so its temperature should increase." Phil: "But it takes energy to melt the ice. Wouldn't that energy be used only for melting, and not changing temperature?" Peggy: "Why stop there? Maybe so much energy is used to change the phase that the temperature would go down!" PREDICTION 1: Which student do you most agree with? Why? If you have access to a metal pot, ice, a stove, and a thermometer, you can do this experiment yourself! Instructions are listed below. Otherwise, watch the video to collect the data. Prepare the temperature sensor by placing it in ice in a cup. Use your thermometer to check the temperature, once the sensor reads approximately 0C, you can proceed with the experiment. Keep the sensor in the ice until you are ready to transfer it to the aluminum can. Set the empty metal pot on a hot stove for a minute or so to warm it up. Remove the pot and set it on a counter (on a pad). . Fill the pot with ice and insert a thermometer. Make sure the thermometer is not touching the sides or bottom of the pot. Record the temperature of the ice every two minutes in the table on the next page, until the ice melts. While you wait for the ice to completely melt, move on to the remaining parts of the lab. Time (min) Temperature (C) Draw the heat diagram for the melting ice. QUESTION 2: Where does the heat come from to melt the ice? ? QUESTION 2: Where does the heat come from to melt the ice? ? Lab #9: Heat Page 4 of 8 Name: O correct? QUESTION 3: What happens to the temperature as the ice melts? Was your prediction ? QUESTION 4: Say you have a cup of ice mixed with water, as you stand outside on a 90 F day. What is the temperature of the water? Justify your answer. 2. Observing Phase Changes One effect of heat transferring into a material is that the phase changes. What happens to the temperature of the material during this phase change? Three students are discussing what is happens when ice melts. Tony: "We know heat is coming into the ice, so its temperature should increase." Phil: "But it takes energy to melt the ice. Wouldn't that energy be used only for melting, and not changing temperature?" Peggy: "Why stop there? Maybe so much energy is used to change the phase that the temperature would go down!" PREDICTION 1: Which student do you most agree with? Why? If you have access to a metal pot, ice, a stove, and a thermometer, you can do this experiment yourself! Instructions are listed below. Otherwise, watch the video to collect the data. Prepare the temperature sensor by placing it in ice in a cup. Use your thermometer to check the temperature, once the sensor reads approximately 0C, you can proceed with the experiment. Keep the sensor in the ice until you are ready to transfer it to the aluminum can. Set the empty metal pot on a hot stove for a minute or so to warm it up. Remove the pot and set it on a counter (on a pad). . Fill the pot with ice and insert a thermometer. Make sure the thermometer is not touching the sides or bottom of the pot. Record the temperature of the ice every two minutes in the table on the next page, until the ice melts. While you wait for the ice to completely melt, move on to the remaining parts of the lab. Time (min) Temperature (C) Draw the heat diagram for the melting ice. QUESTION 2: Where does the heat come from to melt the ice? ? QUESTION 2: Where does the heat come from to melt the ice? ? Lab #9: Heat Page 4 of 8 Name: O correct? QUESTION 3: What happens to the temperature as the ice melts? Was your prediction ? QUESTION 4: Say you have a cup of ice mixed with water, as you stand outside on a 90 F day. What is the temperature of the water? Justify your