Dancing Raisins

The Superheroes are very excited about our new planner:  How The World Works.  We get to explore matter and what changes matter.  This week our experiment involved dancing raisins!  It was quite exciting to see what would happen when you put raisins in Sprite.  And because we are scientists, we began to hypothesize what would happen if we used other types of food.   We tried the experiment again, this time with pasta, rice, candy and chocolate chips.  We were quite surprised to find out that the chocolate chips danced and they danced for a long time!! 
 Now, we are wondering WHY because the raisins are rough  and the chocolate chips are smooth. 
 So, why do the bubbles adhere to the chocolate chips??

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