Question

what happens when flour is added with yast powder

Answer 1

you find out that flours make the best dough

Answer 2

When put in the oven this process speeds up (puffing up the dough some more) and then fairly quickly the Yeast dies. The reactions in this kind of dough happen more quickly (when baking.) Both Baking Powder and Baking Soda react with chemicals in dough during heating to also produce carbon dioxide.