Task:

At this station, you will observe two types of interactions, and then be asked to answer some questions about the interactions.

Materials: 2 resealable plastic bags 2 twist ties 1 half teaspoon measure 1 - 50 mL graduated cylinder baking soda vinegar water paper towels safety goggles

Background:

Directions:

Part A

1. In one of the bags, put 1/2 teaspoon of baking soda into one corner.
2. Tie off the corner of the bag with a twist tie as shown in the diagram.
3. Measure 30mL of WATER and pour it into the empty corner.
4. Remove as much air as possible and seal the bag tightly.
5. Remove the twist tie from the bag and gently mix the baking soda with the water.
6. Describe what you observed after you mixed the contents of this bag. List 2 observations.

1. In the other bag, put 1/2 teaspoon of baking soda into one corner.
2. Tie off the corner of the bag with a twist tie as shown in the diagram.
3. Measure 30 mL of VINEGAR and pour it into the empty corner.
4. Remove as much air as possible and seal the bag tightly.
5. Remove the twist tie from the bag and gently mix the baking soda with the vinegar.
6. Describe what you observed after you mixed the contents of this bag! List two observations.