Today: PowerPoint on leavening agents. Lab Predictions.

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Presentation transcript:

Today: PowerPoint on leavening agents. Lab Predictions

Coming Up… Tomorrow: Cupcake Prep Monday: Cupcake Bake Tuesday: Leavening Agent Quiz

Baking & CHEMICAL Leavening Agents

What is a Leavening Agent? Leavening Agent – a substance which when combined with a trigger, (moisture, heat, acidity) causes a chemical reaction, releasing gas and causing an expansion of dough/batter. Simple terms: An ingredient used in baking which causes dough/batter to rise!

Leavening Agents There are two main types of Leavening Agents used in baking: 1.Yeast 2.Chemicals. Yeast is a microorganism that feeds on sugars, creates gas, and pushes out on the surrounding dough to make it rise. Chemical leavening agents do the same thing as a chemical reaction. The basic reaction is: ACID + BASE = A GAS (CO2)

How do Leavening Agents work? When combined with a trigger (moisture, heat, acid) gas is released gas becomes trapped in the dough/batter, creates bubbles Bubbles trapped inside makes the dough expand, or rise! What does it mean to “rise” in baking?

How the reaction works:

Examples of Acids & Bases Acids Bases Vinegar Baking Soda Buttermilk Cream of Tartar (not tarter sauce) Brown Sugar Molasses Baking Powder = Baking Soda + Cream of Tartar (includes Acid and Base!)

Single vs Double acting Baking Powder: Single Acting Double Acting Used for FAST reactions! Only react ONCE The gas can release at room temperature Used when slower reactions are needed React TWICE! A small amount of gas released when substances mixed, and again when heat is added

How do Leavening Agents effect Baking? Let’s Find Out! The experiment we are going to do on Friday/ Monday is designed to show you how various leavening agents work in the baking process. Follow the directions on the lab, using the appropriate leavening agent and measurements assigned to your kitchen group.

Predictions Make predictions on the turnout of the cupcakes depending on their leavening agent or lack of. You will receive points for doing so.

Example: Save this part for THURSDAY!!! 1 I predict… None