Temp Vs
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Phase Change and Energy Mr. Bartelt’s Chemistry Class
Introduction: We’ve learned a lot about the states of matter in the last two weeks, especially the gas phase. In today’s lab we will take a closer look at phase change and it’s relationship with energy. Procedure: 1) Obtain all necessary materials from your instructor 2) Place the beaker filled with ice on the wire tray on the ring stand above the Bunsen burner. Set up the thermometer as instructed. 3) Designate a group member to be the recorder, and another to be the time keeper. 4) Start the time when the Bunsen burner is ignited. 5) Record the temperature every 30 seconds until the water has reached a rolling boil for over two minutes. 6) Clean your lab station Data: Time
Analysis: Temp.
Time
Temp
Create a graph of temperature vs. time. 1) Label the x-axis time and the y-axis temperature. 2) Determine an appropriate step for each, or use Excel, which will do it for you. 3) Use your data to plot all the points on your graph. 4) Connect all the points on your graph Conclusion: 1) What are the melting and boiling points of water 2) How do you know? 3) Why would it take less energy to raise the temperature of water from 50 ºC to 90 ºC than it would to raise the temperature from 90 ºC to 110 ºC even though 50 to 90 is a greater temperature increase?
Introduction: We’ve learned a lot about the states of matter in the last two weeks, especially the gas phase. In today’s lab we will take a closer look at phase change and it’s relationship with energy. Procedure: 1) Obtain all necessary materials from your instructor 2) Place the beaker filled with ice on the wire tray on the ring stand above the Bunsen burner. Set up the thermometer as instructed. 3) Designate a group member to be the recorder, and another to be the time keeper. 4) Start the time when the Bunsen burner is ignited. 5) Record the temperature every 30 seconds until the water has reached a rolling boil for over two minutes. 6) Clean your lab station Data: Time
Analysis: Temp.
Time
Temp
Create a graph of temperature vs. time. 1) Label the x-axis time and the y-axis temperature. 2) Determine an appropriate step for each, or use Excel, which will do it for you. 3) Use your data to plot all the points on your graph. 4) Connect all the points on your graph Conclusion: 1) What are the melting and boiling points of water 2) How do you know? 3) Why would it take less energy to raise the temperature of water from 50 ºC to 90 ºC than it would to raise the temperature from 90 ºC to 110 ºC even though 50 to 90 is a greater temperature increase?
