Ch.4 - Chemical Quantities & Aqueous ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Which element is oxidized and which is reduced in the following reaction? PbS(s) + 4H2O2(aq) → PbSO4(s) + 4H2O(l)Express your answer as chemical symbols separated by a comma.

Solution: Which element is oxidized and which is reduced in the following reaction? PbS(s) + 4H2O2(aq) → PbSO4(s) + 4H2O(l)Express your answer as chemical symbols separated by a comma.

Problem

Which element is oxidized and which is reduced in the following reaction? 

PbS(s) + 4H2O2(aq) → PbSO4(s) + 4H2O(l)

Express your answer as chemical symbols separated by a comma.

Solution

To determine which element is reduced or oxidized, we must identify the changes in their oxidation states. Compare the oxidation number of the element on the reactant side and on the product side.

Remember the mnemonics:

Loss                Gain

Electrons         Electrons

Oxidation         Reduction


Reaction:

PbS(s) + 4 H2O2(aq) → PbSO4(s) + 4 H2O(l)

Recall the rules for the oxidation states of some elements

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