CH 105L Exp. 4 Post Lab

CH 105L Exp. 4 Post Lab - Skidmore College CH 105L Chemical...

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Name: Sara Geiger Date: October 5, 2007 CH 105L/Section # 2 Instructor: Prof McCluan Directions : Type answers below each question. Use 1.5 line spacing. To format a subscript or superscript, highlight the number, select “Font” from the Format menu, and check the appropriate box. To insert an arrow, select “Symbol” from the Insert menu, and select an arrow from the pop up window. (100 points total) 1. What evidence of a chemical reaction might you see in the following cases? Explain your answer clearly, using complete sentences, third person, passive voice. (12 points) a. dropping an Alka-Seltzer TM tablet into a glass of water When dropping Alka-Seltzer into a glass of water, bubbles immediately appear and the solid substance “disappears”, dissolves, into the water. This forms a new compound, a liquid, which mean a reaction took place. In order for a compound to be broken down, that compound must react with another compound because this breaking down cannot be done by physical means. The reason why this is not a physical change is because the Alka-Seltzer tablet broke down on the chemical level to form a new liquid, it did not merely change to a gas or liquid.
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