1. Module 3

1.10. Page 2

Lesson 2

Module 3—Electrochemical Reactions

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The relative reactivity or stability of a metal is determined empirically. Later in this lesson you will complete an investigation in which you will observe and interpret the data from many systems of metals and aqueous solutions of metal ions.

 

To prepare for the investigation, read page 568 and the top half of page 569 in the textbook. You will learn about the terms oxidizing agent and reducing agent. These terms are commonly used to discuss reactants involved in an electrochemical reaction.

 

Evidence of a chemical reaction can take many forms. List observations that indicate that a chemical reaction has taken place.

 

spontaneous: a process that occurs without any external energy source

 

A spontaneous process will occur on its own.

 

non-spontaneous: a process that is incapable of proceeding unless driven by an outside source of energy

When a colour change, evolution of a gas, formation of a precipitate, or temperature change of a system is observed, the reaction can be described as spontaneous; that is, the chemical change occurs without a continuous input of energy. If no reaction evidence is observed, the reaction is non-spontaneous. 

 

In the next investigation you will determine whether the reaction between various metals and solutions of metal ions is spontaneous or non-spontaneous.