Chemical and Physical Change Lab – 1/15/14

In class, we performed an experiment in which we mixed samples of baking soda, baking powder,and corn starch with small amounts of water,vinegar,and iodine to observe their chemical reactions. Each powder was mixed with each liquid, and all changes both physical and chemical were recorded.
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Now, when given the three powders, you would not be able to tell them apart just by their looks. However, after observing the chemical reactions with the liquids, we discovered that through observing the different chemical and physical reactions, you could tell each substance apart based on its reaction to a liquid. Below are our results.
————————————–
Baking Soda + Water = No Reaction
Baking Soda + Iodine = No Reaction, Baking Soda retained yellow color of Iodine
Baking Soda + Vinegar = Fizzing/Gas
————————————–
Baking Powder + Water = Fizzing/Gas
Baking Powder + Iodine = Fizzed, Iodine turned black
Baking Powder + Vinegar = Fizzing/Gas
—————————————
Corn Starch + Water = No Reaction
Corn Starch + Iodine = Became black in color
Corn Starch + Vinegar = No Reaction

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