Phase Change Lab

Today, groups continued the experiment that was planned last week. Each group member should create a graph from the data to turn in on Thursday.

Graph Analysis:

• Describe the data in your graph. Please make sure that you are clearly explaining the relationship between temperature (plotted on the y-axis) and time (plotted on the x-axis)
• How does the graph of your data compare to the Graph "C" in the warm-up (returned today)?
• Please explain what is happening at each line segment on the graph. What does a straight line mean? What does the rising line mean?

Support Reading: Please read ME p. 103-108 and then identify on the graph where you would find the following points:

• Freezing Point
• Melting Point
• Boiling Point

What is the state of matter for each line segment? - please identify on the graph


Analysis Questions:

1. Graph C shows a horizontal line at the beginning and end of the experiment. What does that horizontal line mean? Why does it happen in this situation?
2. If the steam was captured and heat continued to be added after all the liquid turned to vapor, what would happen to the temperature?
3. Did your beaker lose water before “boiling” occurred? Why do you think this is the case?
4. Look back at Graph B on the warm-up. What do the vertical (straight up) line segments mean? Did this happen in your experiment? Please discuss why or why not.
5. Look back at Graph A. What error is found in this graph?