Rate Of Reaction
Overview
Some reactions are over in a flash, like an explosion, while others, like iron rusting, take years. The rate of reaction measures how fast reactants turn into products, and chemists can speed it up or slow it down by changing the conditions.
In this lesson you will learn what rate of reaction means, how collision theory explains it, and how concentration, surface area, temperature and catalysts change the rate. You will also see how the slope of a graph shows the rate as a reaction proceeds.
Objectives
- [Core] Describe the effect on the rate of reaction of: (a) changing the concentration of solutions (b) changing the surface area of solids (c) changing the temperature (d) adding or removing a catalyst
- [Supplement] Explain the effect on the rate of reaction of: (a) changing the concentration of solutions (b) changing the surface area of solids (c) changing the temperature (d) adding or removing a catalyst using collision theory
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Rate Of Reaction. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- For a reaction to occur, particles must collide with: A. Any energy at all B. At least the activation energy C. No energy D. Equal masses Answer: B
- Increasing the concentration of a reactant increases the rate because: A. The particles are heavier B. There are more frequent collisions C. The activation energy falls D. The temperature rises Answer: B
- Powdering a solid reactant speeds up the reaction because it: A. Lowers the temperature B. Increases the surface area C. Adds a catalyst D. Removes collisions Answer: B
- A catalyst increases the rate of reaction by: A. Being used up B. Raising the activation energy C. Lowering the activation energy D. Cooling the mixture Answer: C
- On a graph of product formed against time, the rate is greatest where the slope is: A. Flattest B. Steepest C. Negative D. Zero Answer: B
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Recommended Books
Further learning from open sources
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Textbook section
Factors Affecting Reaction Rates
Describe the effects of chemical nature, physical state, temperature, concentration, and catalysis on reaction rates
"Chemistry: Factors Affecting Reaction Rates" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/12-2-factors-affecting-reaction-rates. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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Textbook section
Collision Theory
Use the postulates of collision theory to explain the effects of physical state, temperature, and concentration on reaction rates
"Chemistry: Collision Theory" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/12-5-collision-theory. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
Published by other organisations under open licences, credited as they ask. Links open their websites.
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