Preassessment Leavening Agents - Key

Preassessment Leavening Agents - Key

Name Period _ Assign#

1. What is the purpose of leavening agents in quick breads?

To make the quick bread raise.

2. What are two common chemical leavening agents that are used in quick breads?

Baking soda and baking powder.

3-7. Match the following:

D__ 3. Double-Acting Baking Powder

A__ 4. Single-Acting Baking Powder

B__ 5. Baking Soda

C__ 6. Steam

E__ 7. Yeast

A.  Reacts only once-as soon as the chemical is dissolved in liquid.

B.  Must be combined with an acid in order to produce a reaction.

C.  Produced from liquid when the baked product is heated.

D.  Leavens some when dissolved and more when heated.

E.  Forms alcohol and carbon dioxide to cause dough to rise.

8. What two chemicals is sodium bicarbonate made from and why do these chemicals make a basic final product?

Sodium hydroxide and carbonic acid. Carbonic acid is a very weak acid and sodium hydroxide is a strong base: therefore, the final pH is basic.

9. What is baking powder made from?Baking soda, a powdered acid, and a dry substance added as filler (usually cornstarch or calcium carbonate).

10. Why isn't it necessary to add an acid when using baking powder to leaven quick breads?

Because there is already an acid in baking powder.

11. When does most of the chemical reaction take place if one is using double-acting baking powder to leaven quick breads?

When the mixture is heated.