Activity Overview
Students determine how the temperature of water affects the dissolving time of a sugar cube. They create, interpret and analyze graphs of data, find an equation of the line of best fit, and relate slope to rate of change.
Before the Activity
Connect CBL 2™ to the calculator.
Plug the TI temperature sensor into Channel 1 (CH 1) on the CBL 2
Launch the DataMate program
See the attached PDF file for detailed instructions for this activity
Print pages 47 - 48 from the attached PDF file for your class
Transfer files to student calculators using TI-Navigator™ "send to class" feature
During the Activity
Distribute the pages to your class.
Follow the Adventure procedures:
Collect Data:
Place the temperature sensor in the water at 25 oC
Add one sugar cube to the water and start timing
Stir constantly and record when the sugar cube is dissolved completely
Repeat the experiment with water 5oC and 35oC
Plot dissolving time versus temperature of water data
Graph the line of best fit
Determine the slope of the line
Negative slope indicates that as temperature increases, the dissolving time of the sugar cube decreases
After the Activity
Students analyze the results and answer the questions in the worksheet
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary