Education Technology

# Activities

• ##### Subject Area

• Science: Chemistry: Thermochemistry

6-8

60 Minutes

• ##### Device
• TI-73 Explorer™

TI Connect™

• ##### Accessories

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

• ##### Other Materials
This is Activity 10 from the EXPLORATIONS Book:
Data Collection Activities for the Middle Grades with the TI-73, CBL™, and CBR™

The following materials are required for this activity:
• Five congruent containers
• 500 ml water
• 100 cu cm washing soda
• Measuring cup
• Spoon

## Warming a Solution

#### Activity Overview

In this activity, students use a temperature sensor to measure the temperature of water samples before and after adding washing soda. They understand concepts of dependent and independent variables and study the relationship between them.

#### Before the Activity

• Install the CBL/CBR Application on the students' graphing calculators using TI Connect™, TI Connectivity cable and the unit-to-unit link cable
• Connect the TI-73 to the CBL 2 unit
• See the attached PDF file for detailed instructions for this activity
• Print pages 141 - 148 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to your class.

• Pour 100 ml of water in each of the 5 containers and record the initial water temperature
• Use the first container without washing soda as a control and record the temperature
• Add 2 teaspoons of washing soda to a container and note the temperature
• Repeat the activity by adding 3 teaspoons, 4 teaspoons, 5 teaspoons, and 6 teaspoons of washing soda and record the final temperature
• Create a list with the amount of soda added, the initial and the final temperatures
• Generate a triple bar graph and create a scatter plot to compare the changes in temperature after the soda is added
• #### After the Activity

Students will complete the Data Collection and Analysis Sheet and answer the questions listed in it.

Review student results:

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