Reactions between Metals and Metal Ions by hcj


									                      Reactions between Metals and Metal Ions
                                   Experiment #15

               Introduction                          Experiment Overview
A sample of a metal consists of             Metal samples are placed in aqueous
electrically neutral atoms that have not    solutions. Evidence of reaction is
lost electrons. Common substances           recorded, and the metals are ranked in
such as paper clips, aluminum foil,         order of decreasing reactivity.
copper wire and gold jewelry are
composed of neutral atoms of these                        Procedure
metals held together by metallic            Copy the slipsheet into your lab manual.
bonding. When metals combine with
other elements to form compounds,           Obtain samples of aluminum, iron,
however, they lose one or more              magnesium, copper, zinc and lead.
electrons to form positive ions.            Using a slip sheet, test the following
                                            solutions with each metal: aluminum
Consider a piece of metal (neutral          chloride, copper(II) sulfate, iron(III)
atoms) dipped into a solution containing    nitrate, lead(II) nitrate, magnesium
positive and negative ions. There are       nitrate, zinc nitrate, hydrochloric acid
three possibilities for the neutral metal   and nitric acid. Record any and all
atoms: (1) They can gain electrons from     evidence of reaction.
the negative ions. (2) They can lose
electrons to the positive ions. (3) They                 Data Analysis
can fail to react at all.                   Team observations are compared in
                                            class discussion. Rank the metals in
      Prelab Reading Assignment             decreasing order of reactivity. Compare
Section 8.6-8.7                             class data with an accepted Activity
        Experimental Question
What may happen when a metal comes                           Results
in contact with negative and positive       Write a balanced chemical equation for
ions dissolved in an aqueous solution?      each reaction that occurred.

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