1. Start Up Activity Chemical Changes and Energy

2. Procedure  1. Place a small thermometer completely inside a jar, and close the lid. Wait 5 minutes, and record the temperature.  2. While you are waiting to record the temperature, soak ½ of a steel wool pad in vinegar for 2 minutes.

3. Procedures cont’d.  3. Squeeze the excess vinegar from the steel wool. Remove the thermometer from the jar, and wrap the steel wool around the bulb of the thermometer. Secure the steel wool to the thermometer with a rubber band.

4. Procedures cont’d.  4. Place the thermometer and the steel wool inside the jar, and close the lid. Wait 5 minutes and record the temperature.

5. Analysis  1. How did the temperature change?  2. What do you think caused the temperature to change? Hint: Think about your vocabulary terms.  3. Do you think vinegar is a reactant or product? Why?