White Before Your Eyes Lab 1-30-18 No Bell work today.

Success Criteria: I can tell the difference between a physical and chemical change. #TOC: # 11. White Before Your Eyes Lab

#11.White Before Your Eyes! Procedure: . Before you start the lab, put on your safety goggles. . Look at the coffee filters holding the cornstarch. Record your observations about its appearance, such as color and texture, into the column titled “unmixed” on table 1. Repeat this step for the baking powder and the baking soda and record your observations on table 1 under the “unmixed” column. . Use the spoon to put a small amount of cornstarch (about ¼ of the spoon) into the petri dishes. Use the eyedropper to add about 40-50 drops of water to the cornstarch in the first petri dish. Stir the mixture with the stirring rod. Record your observations on table 1 under “mixed with water.” . Use a clean dropper to add 20 drops of vinegar to the cornstarch in the second egg crate Stir. Record your observations in table 1 under the “mixed with vinegar” column. Clean your stirring rod. . Repeat steps 2 – 4 using the baking soda and the baking powder.

Table 1 Observations Substance Unmixed Mixed with Water Mixed with Vinegar Cornstarch Baking Soda Baking Powder Table 2 Mixed with Water Mixed with Vinegar Changes and Properties Change Property Cornstarch Baking Soda Baking Powder

Analysis: What physical properties do all three substances have in common? In table 2, write what type of change you observed, and state the property that the change demonstrates. Predict what type of change you think would occur with the following: sugar and vinegar salt and water Alka-Seltzer and vinegar

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