JAMB/WAEC Chemistry 2027 EP 93 - Factors That Affect The Rate Of Chemical Reactions Part A

JAMB/WAEC Chemistry EP 93 - Factors That Affect the Rate of Chemical Reactions (Part A) + Likely Exam Questions & Solutions Welcome to Episode 93 of the O3Schools Chemistry Tutorial Series. In this lesson, we begin our detailed study of the Factors Affecting the Rate of Chemical Reactions. This topic is one of the most frequently tested areas in JAMB, WAEC, NECO, and Post UTME Chemistry. Understanding these factors helps students explain why some reactions occur rapidly while others take days, months, or even years to complete. What You Will Learn ✅ Meaning of Rate of Reaction ✅ Effect of Concentration on Reaction Rate ✅ Effect of Temperature on Reaction Rate ✅ Collision Theory ✅ Practical Examples ✅ Likely JAMB Questions & Solutions Topics Covered • Rate of Reaction • Concentration • Temperature • Collision Theory • Chemical Kinetics What Is Rate of Reaction? Rate of reaction is the speed at which reactants are converted into products. Some reactions occur almost instantly while others occur very slowly. Examples: Fast Reactions ✔ Burning of petrol ✔ Explosion of fireworks ✔ Neutralization reactions Slow Reactions ✔ Rusting of iron ✔ Fermentation ✔ Decomposition of organic matter Factor 1: Concentration Concentration refers to the amount of reactant particles present in a given volume. When concentration increases: ✔ Number of particles increases. ✔ Frequency of collisions increases. ✔ Rate of reaction increases. Why Concentration Affects Rate According to the Collision Theory: Chemical reactions occur when particles collide effectively. Higher concentration means more particles are available for collisions. More collisions = Faster reaction. Example Hydrochloric acid reacts faster with marble chips when concentrated than when dilute. CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂ Concentrated HCl produces carbon dioxide faster than dilute HCl. Factor 2: Temperature Temperature is one of the most important factors affecting reaction rates. Increasing temperature generally increases the rate of reaction. Why Temperature Affects Rate When temperature increases: ✔ Particles gain kinetic energy. ✔ Particles move faster. ✔ Collision frequency increases. ✔ More particles possess activation energy. Result: Reaction becomes faster. Example Hydrogen peroxide decomposes faster when heated. 2H₂O₂ → 2H₂O + O₂ Collision Theory Collision Theory states that: For a chemical reaction to occur: ✔ Reacting particles must collide. ✔ Collisions must possess sufficient energy. ✔ Particles must collide with correct orientation. Any factor that increases successful collisions increases reaction rate. Everyday Applications Food Preservation Food is kept in refrigerators because lower temperature slows chemical reactions and bacterial growth. Cooking Food cooks faster at higher temperatures because reaction rates increase. Industrial Production Factories use optimum temperatures and concentrations to increase production rates. Frequently Tested JAMB Areas 🔥 Concentration and Reaction Rate 🔥 Temperature and Reaction Rate 🔥 Collision Theory 🔥 Effective Collisions 🔥 Chemical Kinetics 🔥 Industrial Applications Likely JAMB Questions 1. Increasing the concentration of a reactant generally causes the rate of reaction to? A. Decrease B. Remain Constant C. Increase D. Stop Completely Answer: C 2. Which of the following increases the kinetic energy of reacting particles? A. Pressure B. Temperature C. Catalyst D. Surface Area Answer: B 3. According to collision theory, a reaction occurs when particles? A. Evaporate B. Dissolve C. Collide effectively D. Melt Answer: C 4. Food is stored in refrigerators mainly because low temperature? A. Increases reaction rate B. Stops all reactions permanently C. Slows reaction rates D. Produces catalysts Answer: C 5. Which factor increases both collision frequency and collision energy? A. Temperature B. Colour C. Density D. Solubility Answer: A Quick Revision Note ✔ Higher Concentration = Faster Reaction ✔ Higher Temperature = Faster Reaction ✔ More Effective Collisions = Faster Reaction ✔ Collision Theory explains reaction rates. ✔ Most industrial processes depend on controlling temperature and concentration. About O3Schools O3Schools provides high-quality tutorials, CBT practice, likely examination questions, detailed solutions, and examination success strategies for JAMB, WAEC, NECO, and Post UTME candidates. #JAMBChemistry #WAECChemistry #RateOfReaction #ChemicalKinetics #CollisionTheory #TemperatureEffect #ConcentrationEffect #ChemicalReactions #ChemistryTutorial #JAMBPastQuestions #O3Schools #StudySmart #ExamSuccess #NECOChemistry #ChemistryLessons #JAMB2027 #WAECChemistry2027