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7-13 - Chapter 7 Solutions and Reactions Section F A...

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Unformatted text preview: Chapter 7 Solutions and Reactions Section F. A Chemical Reaction Surve : The [on Reaction Chart Goals: (1) T 0 binary-mix the solutions. {2) To describe and record chemical changes. (3) To write net ionic reactions and identify the type. (4) To name the products ofchemtcai reactions. (5) To correlate reactivity with trends in the periodic table. NOTE: Before beginning with Step 1, read Section F completely. Experimental Steps: Binary-mix the 14 solutions provided in Section A (mix one solution with one other) in a dropwise manner on the rectangles (not the test area) of the plastic reaction surface (with the inserted reaction matrix chart). NOTE: Each rectangle corresponds to one mixing. The background is white and black. The idea is to put the drops in each rectangle so that they are partially over a black area, and partially over a white area. This is because the white background is best for viewing colors, but a black background is best for observing white precipitates. - Located in your Student Packet is a version of the reaction chart without the black regions. This should be taped into your notebook and used to record what you see (the phenomenology) in the binary mixing. 0 Devise an accurate code that can be used to describe color changes, precipitate formation or disappearance, textures of precipitates, gas evolution, etc. 0 Try to think about what you expect to see before you mix each pair of drops. NOTE: The best way to mix is to drop 1 drop of a solution onto the rectangle. Then add 1 drop of the second solution, stir, add a second, stir. If you are in doubt about a reaction, feel free to play in the test area. Make sure you understand the arrangement of the reaction chart before you start! Use cotton swabs and micmtowels to keep things neat. Don't write on the plastic shglet - it will destroy your flat reaction surface and drops will roll all over the p ace. CAUTION: Drop the drops - do not touch the solution on the plastic with the lip of the buret or you will contaminate everything! When you have finished, leave the mixed solutions on the reaction chart for comparison with the next section. Section G. Identification of Ei_ht Unknowns Goal: Discussion: To identifi; eight unknowns by comparison with the reactions of the known rotations. The Instructor will give each individual student 8 unknowns. These will be referred to as, "l of 14", "cation unknown", "anion unknown", and "set of 5". 7—20 ...
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