Craig, Marsha A. Everett Elementary

OBJECTIVES: 1) Students will be expected to take various substances and make their own chemical reaction. 2) Students will be expected to recognize the forming of a chemical reaction and record their findings. 3) Students will be able to understand the many properties and uses of carbon dioxide. MATERIALS NEEDED: 50 mL bleach 1 hot plate 50 mL vinegar 1 teaspoon of sugar 2 tablespoons of pure baking soda 1 teaspoon of pure baking 1 tablespoon of dish washing detergent soda 1 glass beaker 1 tin can of piece of foil folded 1 glass beaker OPTIONAL
2 cups of water box of pure baking soda
1 tablespoon of pure baking soda small pyrex dish
2 to 5 drops of liquid dish washing cooking oil (hot)
detergent fire extinguisher
baby bottle
sealed nipple
1 can of carbonated soda

RECOMMENDED STRATEGIES: 1. Review with the class the different gases found in the air. Discuss and list some of the properties of carbon dioxide. Explain that pure baking soda (bicarbonate of soda) can be used to produce carbon dioxide gas. 2. Divide class into three groups. Give each group the materials needed for one complete set up. Each group will combine their substances one at a time until a chemical reaction occurs. One member will be responsible for recording the reactions each time a substance is combine. After each group has completed their experiment, have one representative from each group display and discuss what they saw occuring after adding each substance. 3. Demonstrate by placing a nipple over a baby bottle containing carbonated soda. Gently shake bottle and have class observe how the nipple will expand. Explain when the bottle was shaken the motion forced the carbon dioxide gas out of the solution and the gas gradually inflated the nipple. Further explain and discuss how we depend on carbon dioxide gases when we prepare breads, cakes, and cookies. Acquaint students with products like yeast and baking powder, and baking soda which produce carbon dioxide gas needed to cause dough and batters to rise before and during the baking process. 4. With the hot grease in pyrex dish start a grease fire. Explain how to extinguish the fire using baking soda. Emphasis should be placed on avoiding using water or flour, but instead using baking soda or salt to extinguish fire. Elaborate that baking soda is particularly effective in smothering the oil and cuts off oxygen. Hot baking soda releases carbon dioxide and thus act like a tiny CO2 fire

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