Why do mentos react to coke? also is this a chemical or physical reaction?

Mentos reacts to coca-cola because of the sugars and then they expand which causes the soda to explode out of the open container. this is a chemical reaction because it cause the sugars to expand which you can't see happen.

The mentors react to the coke because of the acid in the two. And it's a chemical reaction

Because a model would make the investigation easier to understand