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105B Fall 2007 Experiment #3 Overall goal: To re-interpret laboratory observations in light of Le Chatelier’s Principle. Subgoals: Classify reactions as: o acid-base o oxidation-reduction o replacement/substitution Write clear concise observations
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Scoring the lab report Boilerplate – ( 0-1) points Example of a one pointer Title Purpose – one sentence Procedure – no more than three sentences “Use the highest level of vocabulary!” Observation Table – “Think Excel not Word” Results - Conclusion- “Did I do what I said I was going to do in the Purpose?” Example of a zero pointer Title Purpose Procedure one or more elements missing Observation Table Results Conclusion Observations and Interpretations – 2 points For each experiment, color changes or lack thereof, changes in number of phases present or lack
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Unformatted text preview: so that it is not necessary to add observations to interpret the result. Prepare yourself for the lab: Exercise #5 (p. 21) ( 1 point) CrO 4 2-(aq) ⇔ Cr 2 O 7 2-(aq) Balance the above reaction but first determine the oxidation state for each element in the reaction. Is this an example of an oxidation-reduction reaction? Even if you discover that it is not, you will find the the rules for materially balancing oxygen and hydrogen from the methods applied in balancing redox reactions to be useful in balancing this equation. Zumdahl Reference 4.10, Sample Exercise4.19 Prepare yourself for the lab quiz (p. 26) (2 points) Independently answer the two questions labeled 8 and 9 on page 26....
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