# Chapter 3 Chemical Reactions - Study Questions - Page 137f: 82

#### Work Step by Step

First reaction: Oxidation-reduction reaction. $Ag_2S$ is an oxidizing agent. $Al$ is a reducing agent. Second reaction: Gas-forming reaction. $H_2S$ is a proton-donor: acid $HCO_3^-$ is a proton-acceptor: base

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