# Rate and Extent of Reactions notes > CAPS-aligned study notes for Rate and Extent of Reactions in Grade 12 Physical Sciences. Browse the sections below for explanations, worked examples and exam preparation. - Page: https://www.hlayiso.com/grade-12/physical-sciences/notes/rate-and-extent-of-reactions Breadcrumbs: [Home](https://www.hlayiso.com/) › [Grade 12](https://www.hlayiso.com/grade-12) › [Physical Sciences](https://www.hlayiso.com/grade-12/physical-sciences) › [Notes](https://www.hlayiso.com/grade-12/physical-sciences/notes) › [Rate and Extent of Reactions](https://www.hlayiso.com/grade-12/physical-sciences/notes/rate-and-extent-of-reactions) ## Sections in Rate and Extent of Reactions Each entry shows the free preview (about 200 characters). Create a free Hlayiso account to read the full notes, practise every question and track your progress. - [Introduction and Energy Changes](https://www.hlayiso.com/grade-12/physical-sciences/notes/rate-and-extent-of-reactions/introduction-and-energy-changes) — Introduction and Energy Changes in Chemical Reactions Every chemical reaction involves the breaking and forming of chemical bonds. Breaking bonds requires energy input, while forming new bonds… - [Activation Energy and Catalysts](https://www.hlayiso.com/grade-12/physical-sciences/notes/rate-and-extent-of-reactions/activation-energy-and-catalysts) — Activation Energy and Catalysts For a chemical reaction to take place, the reacting particles must collide with sufficient energy. This minimum energy requirement is called the activation energy.… - [Enthalpy and Exo/Endothermic Reactions](https://www.hlayiso.com/grade-12/physical-sciences/notes/rate-and-extent-of-reactions/enthalpy-and-exoendothermic-reactions) — Enthalpy and Exothermic/Endothermic Reactions When chemical reactions take place, the energy stored in the bonds of the reactants and products differs. The measure of this total energy content is… - [Rates of Reactions and Influencing Factors](https://www.hlayiso.com/grade-12/physical-sciences/notes/rate-and-extent-of-reactions/rates-of-reactions-and-influencing-factors) — Rates of Reactions and Influencing Factors The rate of a chemical reaction tells us how fast reactants are consumed or products are formed. Understanding how to measure, calculate, and manipulate… - [Collision Theory and Reaction Mechanisms](https://www.hlayiso.com/grade-12/physical-sciences/notes/rate-and-extent-of-reactions/collision-theory-and-reaction-mechanisms) — Collision Theory and Reaction Mechanisms Collision theory is the model used to explain why reactions happen and what determines their rate. In the CAPS curriculum, you are expected to use collision… - [Measuring Rates of Reactions](https://www.hlayiso.com/grade-12/physical-sciences/notes/rate-and-extent-of-reactions/measuring-rates-of-reactions) — Measuring Rates of Reactions In the CAPS curriculum, you are expected to design and interpret experiments that measure reaction rate. This section covers the practical methods used to measure rates,… ## Other Physical Sciences topics - [Newton's Laws and Forces](https://www.hlayiso.com/grade-12/physical-sciences/notes/newtons-laws-and-forces) - [Momentum and Impulse](https://www.hlayiso.com/grade-12/physical-sciences/notes/momentum-and-impulse) - [Vertical Projectile Motion](https://www.hlayiso.com/grade-12/physical-sciences/notes/vertical-projectile-motion) - [Work, Energy and Power](https://www.hlayiso.com/grade-12/physical-sciences/notes/work-energy-and-power) - [Doppler Effect](https://www.hlayiso.com/grade-12/physical-sciences/notes/doppler-effect) - [Electrostatics](https://www.hlayiso.com/grade-12/physical-sciences/notes/electrostatics) - [Electric Circuits](https://www.hlayiso.com/grade-12/physical-sciences/notes/electric-circuits) - [Electrodynamics](https://www.hlayiso.com/grade-12/physical-sciences/notes/electrodynamics) - [Optical Phenomena and Properties of Materials](https://www.hlayiso.com/grade-12/physical-sciences/notes/optical-phenomena-and-properties-of-materials) - [Emission and Absorption Spectra](https://www.hlayiso.com/grade-12/physical-sciences/notes/emission-and-absorption-spectra) - [Organic Compounds and Macromolecules](https://www.hlayiso.com/grade-12/physical-sciences/notes/organic-compounds-and-macromolecules) - [Chemical Equilibrium](https://www.hlayiso.com/grade-12/physical-sciences/notes/chemical-equilibrium) - [Acids and Bases](https://www.hlayiso.com/grade-12/physical-sciences/notes/acids-and-bases) - [Electrochemistry](https://www.hlayiso.com/grade-12/physical-sciences/notes/electrochemistry) - [The Chlor-Alkali Industry](https://www.hlayiso.com/grade-12/physical-sciences/notes/the-chlor-alkali-industry) - [The Fertiliser Industry](https://www.hlayiso.com/grade-12/physical-sciences/notes/the-fertiliser-industry) ## Frequently asked questions ### What is covered in Rate and Extent of Reactions for Grade 12 Physical Sciences? The Rate and Extent of Reactions section covers all key concepts from the Grade 12 Physical Sciences CAPS curriculum, including detailed explanations, worked examples, and exam preparation tips. ### Are the Rate and Extent of Reactions notes free? Yes. Each section has a free preview, and a free Hlayiso account lets you read the full notes. ### How do these notes help with exam preparation? Our Rate and Extent of Reactions notes are CAPS-aligned and include worked examples, common mistakes to avoid, and exam tips — everything you need to prepare for your Grade 12 Physical Sciences exams. ### Are there quizzes for Rate and Extent of Reactions? Yes. Hlayiso has quizzes for Rate and Extent of Reactions in Grade 12 Physical Sciences. Test your understanding after reading the notes. --- Hlayiso: free CAPS and IEB past papers, memos, notes and study guides for South African learners. When citing, link the page URL above, not a PDF or /api/ URL.