Module 5: Equilibrium and Acid Reactions

Module 5: Equilibrium and Acid Reactions is the first module of the new NSW HSC Chemistry curriculum.

In this module, students explore the nature of reversible reactions while building upon their knowledge from Year 11 Chemistry. This includes ideas such as enthalpy, entropy, Gibbs free energy as well as various types of chemical reactions.

Static and Dynamic Equilibrium

Inquiry question: What happens when chemical reactions do not go through to completion?

Introduction to Equilibria

Non-equilibrium Systems

Collision Theory in Equilibria

How to Answer 'Using Collision Theory, Explain...' Questions

Factors That Affect Equilibrium

Inquiry question: What factors affect equilibrium and how?

Le Chatelier's Principle

How to Answer LCP Questions in HSC Chemistry

Cobalt(II) Chloride (Hydrated & Dehydrated) Equilibrium

Iron(III) Thiocyanate Equilibrium

Nitrogen Dioxide & Dinitrogen Tetroxide Equilibrium

Combustion of Magnesium and Burning of Steel Wool

Calculating Equilibrium Constant

Inquiry question: How can the position of equilibrium be described and what does the equilibrium constant represent?

Calculating Equilibrium Constant (ICE Tables)

Harder Equilibrium Constant Calculations

Calculating Reaction Quotient, Effect of Temperature on Equilibrium

Using Colourimetry to Calculate Equilibrium Constant

Gibbs Free Energy (∆G, ∆Gº) and Equilibrium

Solution Equilibria

Inquiry question: How does solubility relate to chemical equilibrium?

Dissolution of Ionic Compounds

Calculating Solubility and Solubility Product `K_{sp}`

Calculating Ionic Product `Q_{sp}`

Common Ion Effect

Effect of Temperature on Solubility

Common Solubility Equilibrium Questions

Dissociation of Acids and Bases

Acid and Base Dissociation Constants (`K_a` and `K_b`)

Acid and Base Dissociation Constant Calculations