Looking for a fun hands on-activity that allows your students to see the leavening process visually? Included in this freebie are pages from our full Leavening Laboratory lesson. The freebie experiment download shows how gas is produced when leavening agents like baking powder and baking soda come into contact with a catalyst, such as water or vinegar. This free version includes step-by-step instructions for the experiment, as well as an experiment observation printable page to help students ret