LESSON DESCRIPTION:
Using a recloseable plastic bag as a reaction chamber, students explore how chemicals can: 1) absorb or release heat as they dissolve in water, 2) can change colors in the presence of an acid or a base & 3) can react to produce gases such as carbon dioxide.

TIME REQUIRED: One Hour

OBJECTIVES:
Students learn what it means for a chemical to dissolve. Students will learn that as chemicals dissolve, they can absorb or produce heat. Older students can learn how to use an indicator to detect the presence of an acid or a base. As well, older students learn the difference between a chemical simply dissolving into a solution and chemicals reacting.

FACILITIES REQUIREMENTS:
Seated table space for all participants.

SAFETY:
Students are warned not to ingest any of the chemicals used in this experiment. Students are warned to use care in handling their recloseable bags so that none of the chemicals spill. The vinegar, baking soda and cabbage juice used in this experiment are very safe and non toxic. With the calcium chloride (road salt), avoid contact with skin, eyes and clothing.

CALIFORNIA SCIENCE STANDARDS ALIGNMENT

Kindergarden: 1st Grade: 2nd Grade: 3rd Grade: 4rth Grade:   5th Grade: 6th Grade: