AdvChemLab

**Purpose:** To observe redox reactions and to write the half reactions that describe them


 * Materials:**
 * pencil
 * paper
 * ruler
 * reaction surface (saran wrap)
 * chemicals listed in grid

**Procedure:** On separate sheets of paper, draw two grids similar to the one on the board. Make each square 2 cm on each side. Place a reaction surface over one of the grids and add one drop of each acid solution to one piece of each metal, as shown above. Use the 2nd grid as a data table to record your observations for each solution.

Using your experimental data, answer the following questions.
 * Analyze**:
 * 1) Which metal is the most reactive? Explain. Which metal did not react with any of the acids? List the metals in order of increasing activity.
 * 2) What is the chemical formula of the gas produced in each reaction?
 * 3) An active metal reacts with an acid to produce hydrogen gas and a salt. Write equations to describe the reactions that you observed. Are all of these redox reactions?