Experimental objectives:

　　1 to stimulate children's desire for exploration and knowledge.

　　2 improve children's observation, practical ability and imagination.

　　Experimental preparation: white vinegar, baking soda, red beans, an empty plastic water bottle, a chopstick and a small spoon.

　　Experimental process

　　We add two spoonfuls of baking soda to the glass, and then add a little water.

　　2. Start stirring with chopsticks. After the quick stirring, we add a small amount of white vinegar several times. Wow! There are a lot of bubbles. At this time, we add red beans. Do the children see them? Red beans really danced, and in the process of dancing, bubbles kept surging!

　　Children, the experiment has been finished, and we have seen many magical phenomena. Red beans can really dance! Why is this?

　　Experimental principle: baking soda reacts with white vinegar to produce carbon dioxide, and bubbles attach to red beans, which increases buoyancy and becomes a swimming ring of red beans. Coupled with continuous reaction, the upward bubbles float to the water with red beans, and the bubbles break after touching the air or hitting other red beans. In addition, the gravity of red beans keeps falling, which produces the phenomenon of red beans dancing.