Chemical Rx 2.pdf - NAME PARTNER(S SECTION DATE AN...

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Exploring the Chemical World, PGCC, 2003 57 NAME ______________________________ SECTION __________ PARTNER(S) ________________________ DATE _____________ AN INVESTIGATION OF CHEMICAL REACTIONS II This activity explores the reactivity of a number of metals using single replacement reactions and investigates the role of solubility in visualization of products of double replacement reactions. Careful observation is important in this activity. PART I: RELATIVE REACTIVITIES PRE-LAB QUERIES 1. In Investigations of Chemical Reactions I you had the experience of placing iron (steel wool) into a solution of copper (II) sulfate and observing the chemical reaction that took place. Refer to that reaction to answer the questions below. Fe (s) + CuSO 4 (aq) ° Cu (s) + FeSO 4 (aq) What color is CuSO 4 (aq)? What color is Cu (s)? Where was the Cu formed? Where was the FeSO 4 ? Why do you think this reaction is called a single replacement 2. You have also observed what happens when magnesium is placed in hydrochloric acid. Mg (s) + 2HCl (aq) ° MgCl 2 (aq) + H 2 What was replaced in this reaction? ____________ What did the replacing? ______________________ ? (g)
Exploring the Chemical World, PGCC, 2003 58 Name three pieces of evidence (visual or auditory) from observing this reaction that would indicate that the reaction actually occurred as shown in the equation above. 1. 3. ____________________________ 2. ___________________________ PROCEDURE 1. For the six combinations of metals and compounds shown in Data Table 1 (on the following page) predict the possible outcome of each reaction by completing the equation and indicating something that you could expect to see in each case assuming the reaction took place. Let's test your predictions. 2. Obtain a spot plate, clean it, and rinse with distilled water. Number six wells. Fill the six wells of the spot plate with the solutions (one per well) as shown in the table below. NOTE: Do not use the FeSO 4 solution if there is brown precipitate in it when placed in a well. Ask the instructor for fresh solution. Place the indicated metals in the numbered wells.

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