Oxidation-Reduction Equations

OBJECTIVES: After having completed this unit, students should be able to:

1. Identify oxidation-reduction (redox) reactions
2. Define the terms oxidation and reduction in terms of loss or gain of electrons and impact on oxidation state
3. Identify which element is oxidized and which element is reduced in a redox reaction
4. Assign oxidation states to the elements in a compound or ion.
5. Predict the products for the single replacement reaction of a metal with an acid, water, or salt and use the activity series to predict whether a reaction will occur
6. Identify oxidizing and reducing agents in redox reactions.
7. Balance oxidation-reduction reactions using the half-reaction method in both acidic and basic solutions.

Reading and Homework Exercises

Table of Contents from: OpenStax Chemistry 2e: Chapter 4, section 4.2  (Oxidation-Reduction Reactions only)

4.2 Classifying Chemical Reactions (Oxidation-Reduction Reactions Only)

Assigning Oxidation Numbers: in the following questions, you will be asked to assign oxidation states of each element in the chemical formulas.

Question 1: Fe

Question 2: Cl₂

Question 3: Fe²⁺

Question 4: Cl^1-

Question 5: CaBr₂

Question 6: Mg₃P₂

Question 7: NO₂

Question 8: N₂O₅

Question 9: NO₃^1-

Question 10: Na₂S₂O₃

Question 11: IO₄^1-

Question 12: Ba(IO₃)₂

Oxidation/Reduction (Redox) reactions

Question 13:

Considering the following redox reaction answer the question below:

Li₂SO₄ + Zn → 2 Li + ZnSO₄

Question 14:

Considering following the redox reaction answer the question below:

3 Fe²⁺ + NO₃^–  + 4 H⁺→ 3 Fe3⁺ + NO  + 2 H2O 

Question 15:

Single Replacement Reactions

See pages 17-23 in the Chemical Reactions Handout (located in the Unit 3 Folder in the course D2L site) for additional info on single replacement reactions (including the _activity series of metals) and help with the following questions.

Question 16:

Mg + AgI→

Question 17:

Ni + H₃PO₄→

Question 18:

Cu + Al₂O₃→

Balancing Redox Reactions and half reactions

Question 19: A redox reaction between dichromate ion and hydrogen sulfide is carried out in acidic solution.

Cr₂O₇^2- + H₂S → Cr³⁺ + S

Answer the following question:

Question 20: A redox reaction between aluminum ion and nitrogen monoxide is carried out in basic solution.

Al³⁺ + NO → HNO₂ + Al

Answer the following question: