Education Technology

# Activities

• ##### Subject Area

• Science: Chemistry: Chemical Equations and Reactions
• Math: Algebra I: Linear Functions
• Math: PreAlgebra: Linear Functions

6-8

45 Minutes

• ##### Device
• TI-73 Explorer™
• TI-Navigator™

TI Connect™

• ##### Accessories

CBL™/CBL 2™
Sensor - Temperature
TI Connectivity Cable

• ##### Other Materials
This is Adventure 7 from the EXPLORATIONS Book:
Adventures in Data Collection with TI-73 Explorer.

The following materials are required for this activity:
• Three 350 ml beakers
• Timer or watch with second hand
• Three sugar cubes
• Water (5oC, 25oC, 35oC)

## A Sweet Drink - Adventure 7

#### 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.

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