Detecting Signs of Chemical Change

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Detecting Signs of Chemical Change REAC 399 Prepared by: Elizabeth G. Perez Date of experiment: October 3, 2006 Course: Chemistry 100/60 Abstract: The objective of this experiment will be to combine various substances, liquids and metals, and to observe their behavior when they are combined. The types of reactions observed shall determine the nature of these reactions: physical or chemical. Introduction: An elements¡¦ reaction to certain substances may be predicted by its placement on the Periodic Table of Elements. Across a period, an element on the left will react with more vigor than one on the right, of the same period. Vertically, as elements are sectioned into groups, the reaction of each element increases…show more content…
Discard the solution in the appropriate container as directed to you by your lab instructor. E. Wash your hands and all of the equipment with mild soap and water. As a final rinse on the equipment, use deionized water. Dry all equipment thoroughly. Data Table Substance Observations Was there a chemical change? 1 0.1M cobalt (II) chloride hexahydrate 95% ethanol Product turned deep blue in color yet remained clear of precipitate. Yes. 2 0.1M cobalt (II) chloride hexahydrate dissolved in 95% ethanol Water Product turned medium pink in color yet remained clear of precipitate. Yes. 3 Zinc 1M hydrochloric acid solution Product bubbled upon addition to the hydrochloric acid; liquid turned cloudy ¡V precipitate was present; zinc sample disintegrated slowly and turned black in color. Yes. 4 Zinc 0.1M copper (II) sulfate solution No vigorous reaction occurred; rather, the zinc sample disintegrated slowly and turned red in color. Yes. 5 0.1M copper (II) sulfate solution 1M hydrochloric acid solution No reaction occurred. No. 6 0.1M copper (II) sulfate solution 0.5M sodium hydrogen carbonate solution Heavy precipitate emerged immediately and solution turned white in color; solution then became opaque and turned light, bright blue in color. Yes. 7 0.1M copper (II) sulfate solution 1M ammonia solution Medium amount of precipitate became present; solution then became opaque and turned medium blue in

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