## Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning

# Chapter 3 - Chemical Reactions - Problem Solving Practice 3.12 - Page 123: b

#### Answer

The reaction will occur. Solid aluminium $Al(s)$ has oxidized, and the cromate (III) ion $Cr^{3+}$ has been reduced. The oxidizing agent is the $Cr^{3+}$, and the reducing agent is the solid aluminium $Al(s)$.

#### Work Step by Step

- According to the Table 3.4, $Al$ is higher on the activity series than $Cr$, making the reaction possible. - The aluminium has, initially, zero as its oxidation number, and after the reaction, it has +3, which makes it a reducing agent. - The Chromate had, initially, +3 as its oxidation number, and after the reaction, it has 0, which makes it an oxidizing agent.

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