2nd grade Activities for V.2.E.1

Activity: Air Takes Up Space and Has Weight
Materials:
vinegar
baking soda
balloon
24 oz soda bottle (empty)
Activity: Put about 1 tsp of baking soda into an empty balloon.
Tie balloon lightly with a piece of yarn. Add about a 1/2 cup of vinegar to a 24 oz soda bottle. Stretch the balloon over the soda bottle without releasing the baking soda. Dump baking soda while holding the balloon over the bottle neck. Observe!!!

Activity: Does Air Have Weight?
Purpose: To show that air has weight
Materials: yard/meter stick, 2 tacks, 2 balloons, fulcrum
On a fulcrum, balance a yard/meter stick. Tack an empty balloon on to each end of the stick. The stick should balance on the fulcrum. Ask students for their predictions to the question: If one balloon is filled with air, will they still balance? Have students record their predictions. Blow up one balloon, tack it on one end, leave the other empty balloon on the other end of the stick. Place the yard/meter stick on fulcrum. Record observations.

Students record whether their prediction matched or didn’t match the result. Stress that all predictions do not always match the result, and that they are not wrong if their prediction didn’t match.

Activity: What’s in a Cloud?
Purpose: To understand how clouds form and what’s inside them.
Materials: 2 small clear plastic cups, hot water, flashlight (optional), magnifying lens, student activity sheet
Procedure:
1. Put 1/3 cup of hot water in a plastic cup.
2. Place a second plastic cup upside down on the first cup. Make sure the rims meet evenly and that the cups are sealed.
3. Observe what’s happening in the cups. Turn the lights out and use a flashlight to observe the formation of a cloud. A better view can be seen by using a magnifying lens.
4. Students document their findings and discuss how the experiment relates to cloud formation in nature.
**How Does It Work? A cloud contains billions of tiny water or ice droplets that form around dust or salt. Clouds form when water vapor (a gas) changes into liquid and warm and cold air meet. In the activity, the warm, moisture-saturated air in the bottom of the cup moved upward and met the cooler air at the top of the cup.

AIMS - “A Crazy Colloids” (July/August 1991) AIMS Education Foundation