UPCAT Chemistry — Chemical Equilibrium & REDOXSlides
Slide deck for UPCAT Chemistry — Chemical Equilibrium & REDOX. These slides are built for quick visual review, highlighting the key concepts, formulas, and question patterns from this chapter of the UPCAT 2026 syllabus.
Exam context
For the University of the Philippines College Admission Test, University of the Philippines tests Chemistry under a "Core" label, with Chemical Equilibrium & REDOX in the 7th slot across 7 chapters. UPCAT candidates must clear the UPG ≤ 2.2 typical cut on the 2026 paper, which draws about 20 Chemistry questions. Date to watch: Mid-2026 (announced by UP Admissions).
Chemical Equilibrium & REDOX - Slides
This chapter explores two fundamental concepts in chemistry: chemical equilibrium and oxidation-reduction (REDOX) reactions. Chemical equilibrium describes the dynamic balance between forward and reverse reactions, while REDOX reactions involve the transfer of electrons between substances. These concepts are essential for understanding many chemical processes in nature and industry.
Slides
Chemical Equilibrium & REDOX Overview
This chapter covers two interconnected areas of chemistry that help us understand how reactions proceed and reach balance, as well as how electrons move between atoms and molecules.
Notes
Introduction to the two major topics covered in this chapter
Topic
Chapter Overview
Slide Id
S1
Visual Type
mermaid
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1
Mermaid Diagram
Code
mindmap root((Chemical Equilibrium & REDOX)) Chemical Equilibrium Dynamic Balance Forward and Reverse Rates Closed System Constant Concentrations REDOX Reactions Electron Transfer Oxidation Loss Reduction Gain Oxidizing Agent Reducing Agent Applications Industrial Processes Biological Systems Energy Production
Type
mermaid_mindmap
Description
Mind map showing the main concepts of chemical equilibrium and REDOX reactions with their key characteristics and applications
What is Chemical Equilibrium?
Chemical equilibrium occurs when a reversible reaction reaches a point where the rate of products forming equals the rate of products breaking down back into reactants.
Notes
Emphasize that equilibrium is dynamic - reactions continue but with no net change
Topic
Chemical Equilibrium Definition
Slide Id
S2
Visual Type
mermaid
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Slide Number
2
Mermaid Diagram
Code
flowchart TD A[Reactants] -->|Forward Rate| B[Products] B -->|Reverse Rate| A C[At Equilibrium] --> D[Forward Rate = Reverse Rate] D --> E[Concentrations Constant] E --> F[Dynamic Process Continues]
Type
mermaid_flowchart
Description
Flowchart showing how chemical equilibrium is established when forward and reverse reaction rates become equal
Characteristics of Chemical Equilibrium
These five key characteristics define what makes a chemical system at equilibrium and how it behaves under different conditions.
Notes
Highlight that equilibrium can be reached from either reactants or products
Topic
Equilibrium Characteristics
Slide Id
S3
Visual Type
mermaid
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3
Mermaid Diagram
Code
stateDiagram-v2 [*] --> ReactantsOnly ReactantsOnly --> ForwardDominant: Reaction starts ForwardDominant --> Equilibrium: Rates balance ProductsOnly --> ReverseDominant: Reverse reaction ReverseDominant --> Equilibrium: Rates balance Equilibrium --> ShiftedEquilibrium: Condition change ShiftedEquilibrium --> Equilibrium: New balance
Type
mermaid_stateDiagram
Description
State diagram showing how chemical systems reach equilibrium from different starting points and respond to changes
Thermochemistry and Energy
Thermochemistry studies energy changes during chemical reactions, which helps us understand why reactions occur and reach equilibrium.
Notes
Connect energy concepts to equilibrium - systems seek lowest energy state
Topic
Thermochemistry
Slide Id
S4
Visual Type
mermaid
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4
Mermaid Diagram
Code
flowchart TD A[Energy in Chemical Systems] --> B[Potential Energy] A --> C[Kinetic Energy] B --> D[Stored Energy] C --> E[Motion Energy] E --> F[KE = 1/2 mv²] A --> G[Energy Transfer] G --> H[Heat q] G --> I[Work w] H --> J[ΔU = q + w] I --> J
Type
mermaid_flowchart
Description
Flowchart showing different types of energy in chemical systems and how energy transfer occurs
Introduction to REDOX Reactions
REDOX reactions are a major class of chemical reactions where electrons are transferred from one substance to another, resulting in changes in oxidation numbers.
Notes
Emphasize that REDOX is about electron movement, not just oxygen addition
Topic
REDOX Introduction
Slide Id
S5
Visual Type
mermaid
Image Prompt
Slide Number
5
Mermaid Diagram
Code
flowchart TD A[REDOX Reactions] --> B[Electron Transfer] B --> C[Oxidation] B --> D[Reduction] C --> E[Loss of Electrons] D --> F[Gain of Electrons] A --> G[Applications] G --> H[Combustion] G --> I[Electricity] G --> J[Cellular Energy]
Type
mermaid_flowchart
Description
Flowchart showing the fundamental concept of REDOX reactions as electron transfer processes with various applications
Oxidation and Reduction Definitions
Understanding these definitions is crucial for identifying and analyzing REDOX reactions. The agents undergo the opposite process from what they cause.
Notes
Use OIL RIG memory aid to help students remember electron transfer direction
Topic
REDOX Definitions
Slide Id
S6
Visual Type
mermaid
Image Prompt
Slide Number
6
Mermaid Diagram
Code
flowchart TD A[REDOX Process] --> B[Oxidation] A --> C[Reduction] B --> D[Loss of Electrons] B --> E[Oxidation Number Increases] C --> F[Gain of Electrons] C --> G[Oxidation Number Decreases] H[Oxidizing Agent] --> I[Causes Oxidation] I --> J[Gets Reduced] K[Reducing Agent] --> L[Causes Reduction] L --> M[Gets Oxidized]
Type
mermaid_flowchart
Description
Flowchart illustrating the definitions of oxidation, reduction, and the roles of oxidizing and reducing agents
Oxidation Number Rules (Part 1)
Oxidation numbers help track electron transfer in REDOX reactions. These rules provide a systematic way to assign oxidation numbers to atoms in compounds.
Notes
Focus on the most common and important rules first
Topic
Oxidation Number Rules
Slide Id
S7
Visual Type
none
Image Prompt
Slide Number
7
Mermaid Diagram
Type
none
Oxidation Number Rules (Part 2)
These additional rules cover halogens and the important constraint that oxidation numbers must sum to the overall charge of the molecule or ion.
Notes
Emphasize checking that oxidation numbers sum correctly
Topic
Oxidation Number Rules
Slide Id
S8
Visual Type
mermaid
Image Prompt
Slide Number
8
Mermaid Diagram
Code
flowchart TD A[Assign Oxidation Numbers] --> B[Apply Rules 1-6] B --> C[Calculate Sum] C --> D{Neutral Molecule?} D -->|Yes| E[Sum = 0] D -->|No| F[Sum = Ion Charge] E --> G[Check Answer] F --> G G --> H[Identify REDOX Changes]
Type
mermaid_flowchart
Description
Flowchart showing the step-by-step process for assigning oxidation numbers and checking the results
Oxidation Number Examples
Working through examples helps students master the systematic approach to finding oxidation numbers, especially for less obvious cases like nitrogen in nitrate.
Notes
Show step-by-step calculation for complex examples
Topic
Oxidation Number Examples
Slide Id
S9
Visual Type
mermaid
Image Prompt
Slide Number
9
Mermaid Diagram
Code
flowchart TD A[KNO₃] --> B[K = +1] A --> C[O = -2] A --> D[N = ?] E[Sum must equal 0] --> F[+1 + N + 3(-2) = 0] F --> G[+1 + N - 6 = 0] G --> H[N = +5] B --> E C --> E D --> E
Type
mermaid_flowchart
Description
Flowchart showing the calculation process for determining the oxidation number of nitrogen in KNO₃
Identifying Oxidizing and Reducing Agents
By tracking changes in oxidation numbers, we can identify which species are oxidized or reduced and determine the oxidizing and reducing agents.
Notes
Emphasize that the agent does the opposite of what it causes
Topic
REDOX Agents
Slide Id
S10
Visual Type
mermaid
Image Prompt
Slide Number
10
Mermaid Diagram
Code
flowchart TD A[2H₂ + O₂ → 2H₂O] --> B[Assign Oxidation Numbers] B --> C[H₂: 0 → +1] B --> D[O₂: 0 → -2] C --> E[H₂ Oxidized] D --> F[O₂ Reduced] E --> G[H₂ is Reducing Agent] F --> H[O₂ is Oxidizing Agent]
Type
mermaid_flowchart
Description
Flowchart showing how to identify oxidizing and reducing agents by comparing oxidation number changes
Balancing REDOX Equations - Overview
Balancing REDOX equations requires special techniques because we must account for electron transfer in addition to mass balance.
Notes
Introduce both methods before diving into details
Topic
REDOX Balancing Methods
Slide Id
S11
Visual Type
mermaid
Image Prompt
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11
Mermaid Diagram
Code
flowchart TD A[REDOX Equation] --> B{Choose Method} B -->|Simpler| C[Oxidation Number Method] B -->|Complex| D[Half-Reaction Method] C --> E[Balance electrons] D --> E E --> F[Complete balancing] F --> G[Check mass and charge]
Type
mermaid_flowchart
Description
Flowchart showing the decision process for choosing a REDOX balancing method
Oxidation Number Method - Steps
The oxidation number method is systematic and works well for many REDOX equations. It focuses on electron changes to determine balancing coefficients.
Notes
Walk through each step systematically with the example
Topic
Oxidation Number Method
Slide Id
S12
Visual Type
mermaid
Image Prompt
Slide Number
12
Mermaid Diagram
Code
flowchart TD A[Unbalanced REDOX] --> B[Assign O.N.] B --> C[Identify Changes] C --> D[Count Electrons] D --> E[Balance Electrons] E --> F[Add Coefficients] F --> G[Complete Balance] G --> H[Check Final Equation]
Type
mermaid_flowchart
Description
Step-by-step flowchart for the oxidation number method of balancing REDOX equations
Oxidation Number Method - Example
This example demonstrates the complete process, showing how electron balance determines the coefficients needed for the balanced equation.
Notes
Emphasize how electron balance determines coefficients
Topic
Oxidation Number Method Example
Slide Id
S13
Visual Type
mermaid
Image Prompt
Slide Number
13
Mermaid Diagram
Code
sequenceDiagram participant Al as Aluminum participant H as Hydrogen Al->>H: Transfers 6 electrons Note over Al: Al → Al³⁺ + 3e⁻ Note over Al: (2 Al atoms = 6e⁻) Note over H: H⁺ + e⁻ → H Note over H: (6 H⁺ = 6e⁻) H-->>Al: Balanced electron transfer
Type
mermaid_sequence
Description
Sequence diagram showing electron transfer between aluminum and hydrogen in the balanced REDOX reaction
Half-Reaction Method - Steps
The half-reaction method is more systematic for complex REDOX equations, especially in acidic or basic solutions. It handles each half-reaction separately before combining.
Notes
Emphasize the systematic approach of balancing each half separately
Topic
Half-Reaction Method
Slide Id
S14
Visual Type
mermaid
Image Prompt
Slide Number
14
Mermaid Diagram
Code
flowchart TD A[REDOX Equation] --> B[Separate Half-Reactions] B --> C[Oxidation Half] B --> D[Reduction Half] C --> E[Balance Atoms] D --> E E --> F[Balance Charge] F --> G[Equalize Electrons] G --> H[Add Half-Reactions] H --> I[Final Balanced Equation]
Type
mermaid_flowchart
Description
Flowchart showing the systematic steps of the half-reaction method for balancing REDOX equations
Half-Reaction Method - Detailed Example
This complete example shows how to balance atoms (Cl, I, O, H) and charges in each half-reaction, then combine them with proper electron balance.
Notes
Show complete balancing process step by step
Topic
Half-Reaction Method Example
Slide Id
S15
Visual Type
mermaid
Image Prompt
Slide Number
15
Mermaid Diagram
Code
sequenceDiagram participant ClO3 as ClO₃⁻ participant I as I⁻ ClO3->>I: Accepts 6 electrons Note over ClO3: ClO₃⁻ + 6H⁺ + 6e⁻ → Cl⁻ Note over I: 6I⁻ → 3I₂ + 6e⁻ I-->>ClO3: Provides 6 electrons Note over ClO3, I: Balanced: 6e⁻ transferred
Type
mermaid_sequence
Description
Sequence diagram illustrating the electron transfer in the balanced half-reactions between chlorate and iodide ions
Applications of Chemical Equilibrium
Chemical equilibrium principles are applied in many real-world situations, from industrial manufacturing to biological processes that sustain life.
Notes
Connect equilibrium concepts to real-world applications students can relate to
Topic
Equilibrium Applications
Slide Id
S16
Visual Type
mermaid
Image Prompt
Slide Number
16
Mermaid Diagram
Code
mindmap root((Equilibrium Applications)) Industrial Haber Process Contact Process Petroleum Refining Environmental Ocean CO2 Atmospheric Chemistry Acid Rain Biological Oxygen Transport Enzyme Function Buffer Systems Laboratory pH Control Solubility Analytical Chemistry
Type
mermaid_mindmap
Description
Mind map showing the diverse applications of chemical equilibrium in industrial, environmental, biological, and laboratory settings
Applications of REDOX Reactions
REDOX reactions are fundamental to energy conversion, metal production, life processes, and many industrial applications that affect daily life.
Notes
Highlight how REDOX reactions are essential to modern technology and life
Topic
REDOX Applications
Slide Id
S17
Visual Type
mermaid
Image Prompt
Slide Number
17
Mermaid Diagram
Code
mindmap root((REDOX Applications)) Energy Batteries Fuel Cells Solar Cells Combustion Biology Respiration Photosynthesis Metabolism Industry Metal Extraction Electroplating Bleaching Environment Water Treatment Corrosion Pollution Control
Type
mermaid_mindmap
Description
Mind map illustrating the wide range of REDOX reaction applications in energy, biology, industry, and environmental processes
Key Formulas and Relationships
These fundamental formulas and relationships are essential tools for solving problems involving chemical equilibrium and REDOX reactions.
Notes
Provide clear formula reference for problem-solving
Topic
Key Formulas
Slide Id
S18
Visual Type
none
Image Prompt
Slide Number
18
Mermaid Diagram
Type
none
Problem-Solving Strategy
A systematic approach to problem-solving helps students tackle complex equilibrium and REDOX problems with confidence.
Notes
Emphasize systematic approach and checking answers
Topic
Problem-Solving Strategy
Slide Id
S19
Visual Type
mermaid
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Slide Number
19
Mermaid Diagram
Code
flowchart TD A[Chemistry Problem] --> B{Type?} B -->|Equilibrium| C[Identify System] B -->|REDOX| D[Assign O.N.] C --> E[Analyze Changes] D --> F[Identify Agents] E --> G[Apply Principles] F --> H[Balance Equation] G --> I[Check Answer] H --> I I --> J[Verify Logic]
Type
mermaid_flowchart
Description
Problem-solving flowchart showing the systematic approach to tackling equilibrium and REDOX chemistry problems
Chapter Summary
This chapter covered fundamental concepts that explain how chemical reactions reach balance and how electrons move between atoms, forming the basis for understanding many chemical processes.
Notes
Comprehensive review of all major topics covered
Topic
Chapter Summary
Slide Id
S20
Visual Type
mermaid
Image Prompt
Slide Number
20
Mermaid Diagram
Code
mindmap root((Chapter Summary)) Chemical Equilibrium Dynamic Balance Closed Systems Rate Equality Applications REDOX Reactions Electron Transfer Oxidation Numbers Balancing Methods Real World Uses Key Skills Problem Solving Equation Balancing Agent Identification
Type
mermaid_mindmap
Description
Mind map summarizing the key concepts, principles, and skills covered in the Chemical Equilibrium and REDOX chapter
References
- CET 2026 COMPREHENSIVE LECTURE NOTES — Science.pdf
- General Chemistry Principles and Modern Applications
- Philippine Science High School Chemistry Curriculum
- UPCAT Science Review Materials
In summary
Chemical equilibrium and REDOX reactions are fundamental concepts in chemistry that explain how reactions reach balance and how electrons transfer between substances. Understanding these concepts provides insight into countless natural and industrial processes, from the oxygen transport in our blood to the batteries that power our devices. Mastering oxidation numbers, balancing techniques, and the principles of equilibrium will provide a strong foundation for advanced chemistry studies and practical applications in science and technology.
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