Module 3
1. Module 3
1.2. In this Module
Module 3—Electrochemical Reactions
In This Module
Lesson 1—Electrochemical Change
In Lesson 1 you will observe some chemical reactions in a new way—as electrochemical changes. You will learn to write chemical reactions that demonstrate the kind of change that occurs in these systems, and you will learn how to interpret these reactions.
You will investigate the following lesson question:
- What is an electrochemical change?
Lesson 2—Predicting Redox Reactions
In Lesson 2 you will analyze sets of data collected from the reaction of metals with aqueous metal ions to identify patterns in the reactivity of metals and their ions. You will use these patterns to predict reactions involving other substances.
You will investigate the following lesson questions:
- Why do some metals appear to react more easily than other metals?
- Is it possible to predict whether an electrochemical reaction will occur spontaneously?
Lesson 3—Half-Reactions
In Lesson 3 you will learn to write and use half-reactions involving more than one oxidizing or reducing agent. You will use half-reactions and net ionic equations to explain chemical change in systems in which the half-reactions for the oxidizing and reducing agents are not provided to you.
You will investigate the following lesson questions:
- How can combinations of species act together as oxidizing or reducing agents?
- Can half-reactions be used to predict and explain changes that occur within a chemical system?
- Can the same substance be the oxidizing agent and the reducing agent in an electrochemical process?
Lesson 4—Oxidation Numbers and Corrosion Protection
In Lesson 4 you will interpret empirical changes in terms of oxidation states (sometimes as distinctive as colour changes by certain metal ions) or numbers used to explain the oxidation or reduction of atoms.
You will investigate the following lesson questions:
- What are oxidation numbers, and how can they be used to understand redox reactions?
- What factors cause corrosion?
- How can corrosion be prevented?
Lesson 5—Redox Stoichiometry
In Lesson 5 you will learn how to adapt your knowledge of redox reactions into designing and performing quantitative analysis. You will investigate quantitative relationships using a titration experiment involving oxidizing and reducing agents. In Module 4 you will extend this to understanding other quantitative measures.
You will investigate the following lesson questions:
- How can a chemical system be analyzed using redox reactions?
- How is the stoichiometric method applied to redox systems?