Education Technology

# Activities

• ##### Subject Area

• Science: Chemistry: Physical Changes

6-8

60 Minutes

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

TI Connect™
TI-GRAPH LINK™

• ##### Accessories

CBL™/CBL 2™
Sensor - Temperature
TI Connectivity Cable
TI-GRAPH LINK™ Cable
Unit-to-Unit link cables

• ##### Other Materials
This is Activity 6 from the EXPLORATIONS Book:
Activities for Middle Grades Science with the CBL 2™ and TI-73.

The following materials are required for this activity:
• Three 350 mL beakers
• Graduated cylinder
• Timer or watch with second hand
• Three sugar cubes
• Water at 5' C, 25' C and 35' C
• Data Collection and Analysis pages (52-53)
• ##### Report an Issue

The Effect of Temperature on the Rate of Dissolving

#### Activity Overview

In this activity, students' will use a Temperature Sensor to collect data and then analyze that data to determine the effect of temperature increases on the rate of dissolving. They will identify temperature as a factor in dissolving rate of reaction.

#### Before the Activity

• Connect the Temperature Sensor in channel 1 of the CBL 2
• Download DataMate™ program
• See the attached PDF file for detailed instructions for this activity
• Print pages 49 - 53 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to your class.

• Complete the Hypothesis section on the Data Collection and Analysis page and predict the effect of water temperature on the dissolving time of a sugar cube

• Follow the Activity procedures:
• Place the temperature sensor in the first beaker with water and verify that the temperature is at 25' C
• Add one sugar cube and start timing
• Stir constantly
• When the sugar cube dissolves stop the timer
• Calculate the time taken to dissolve
• Repeat the activity with water at 5' C and 35' C
• Record the time and temperature data
• Graph the data using the linear regression function
• #### After the Activity

Students' will complete Student Data Collection and Analysis Sheet.

Review student results

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary