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Science
Grade: Middle
Subject: Science

#193. Chemical Recaction

Science, level: Middle
Posted by Donnie Bradshaw (Dbradshaw@cc.memphis.edu).
Snowden Middle, Memphis, TN.
Materials Required: vinegar, baking soda, measuring spoons, water, cup, thermometer, graph paper, ruler, calculator
Activity Time: 15 minutes
Concepts Taught: Chemical Recaction

OBJECTIVE
Students will determine if a chemical reaction has occured based on temperature change.

PROCEDURE
1. Divide the class into groups and distribute the materials. Instruct each group to make a chart to record the temperature and time (seconds).

2. Next, tell students to place 2 tablespoons of vinegar in the cup and put in the thermometer. Instruct students to read and record the temperature in the chart under Time 0.

3. Now, have students to measure and dump one teaspoon of baking soda in the cup. ne student should swirl the cup while another student record the temperature every three seconds.

4. Tell students to collect ten readings and then graph their results.

5. Have each group to use the TI-82 graphing calculator to verify their graphs.

6. Discuss with students if a chemical reaction occured. Students should be able justify their responses.

EXTENSION
A CBL data collector may be used for the traditional thermometer.