Observing a Single Chemical Reaction

Topics: Scientific method, Observation, Hypothesis Pages: 3 (792 words) Published: September 11, 2011
Observing a Single Chemical Reaction
Qualitative vs. Quantitative Observations

The purpose of this experiment is to help you sharpen your observational skills.  The aluminum foil was found to rust in the water containing the dissolved Copper Chloride (CuCl₂) crystals. The results of the experiments were determined through close examination and observation of both qualitative and quantitative elements of the changes that occurred when a blue crystal, Copper Chloride, reacted with aluminum foil. In conclusion, aluminum foil is turned into copper when in contact with Copper Chloride (CuCl₂) granules.

Group Members and Contributions:
Priyanka Potdar and Evani Shah both contributed equally to the final lab report of the “Observing a Single Chemical Reaction” lab. They both split up the work and eventually edited the final lab report together on Google Documents. Evani completed the Title Page and Abstract, while Priyanka completed the Discussion questions. They organized their “Observation/Data” section individually. Priyanka and Evani emailed each other for doubts and concerns, finishing their lab report on August 30, 2011

1. From your list of observations, select two that are clearly qualitative and explain why. There were two clearly qualitative observations in Step 2 of the experiment. First, the Copper chloride (CuCl₂) granules were flaky substances. Second, the aluminum foil was high in luster, in other words, shiny. These observations were qualitative because they referred to descriptions or distinctions based on some quality or characteristic rather than on some quantity or measured value.

2. From your list of observations, select clear examples of two that are quantitative and explain why. There were two clear examples of quantitative observations in Steps 2 and 5 of the experiment. First, in Step 2, the rectangular piece of aluminum foil measured 4.5 by 3.5 centimeters. Second, in Step 5, the temperature of the...
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