41. Ki Tisa-Tablets of stone-Sabbath-Passover-Shavuot-Sukkot-Leavening agent -Fasting 42. The outer dough shell is prepared with flour, water, and a leavening agent such as yeast or baking powder. 43. -- Check expiration dates on leavening agents such as baking powder to avoid ending up with a baking failure. 44. Despite its potential dangers, " C . perfringens " is used as the leavening agent in salt rising bread. 45. Water vapor also expands more than water as a liquid so it can act as a leavening agent as well. 46. It would seem logical that more baking powder, usually the leavening agent added to cakes, would result in higher cakes, right? 47. It is commonly mixed with sodium bicarbonate and is sold as baking powder used as a leavening agent in food preparation. 48. Leavening was known; the Greeks later used an alkali ( " nitron " ) or wine yeast as a leavening agent . 49. What makes the breads quick is that most rely on leavening agents such as baking powder and baking soda for their rising action. 50. When leavening agents were developed in the mid-1800s, they were often promoted as magical, giving boosts to cakes with less butter and eggs.