Lesson 5: Rate Law
Duration of Days: 3
Lesson Objective
By the end of this lesson, students will be able to:
Define rate law and explain its significance in chemical kinetics
Write rate law expressions for chemical reactions
Determine reaction orders from experimental data
Calculate rate constants using initial rates method
Interpret the relationship between reaction order and reaction rate
How do rate laws help us understand and predict the speed of chemical reactions?
What factors influence the rate of a chemical reaction?
How can we determine the rate law for a reaction experimentally?
Rate law
Reaction order
Rate constant
Initial rates method
Zero-order reaction
First-order reaction
Second-order reaction
Overall reaction order
NGSS HS-PS1-5: Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.
Data analysis and interpretation
Application of mathematical concepts to scientific problems
Critical thinking and problem-solving skills
This lesson introduces students to rate laws, their importance in chemical kinetics, and methods for determining rate laws experimentally. Students will engage in lectures, problem-solving exercises, and a hands-on experiment to reinforce their understanding of rate laws.
Purpose
To develop students' ability to quantitatively describe reaction rates and understand how concentration affects the speed of chemical reactions.
DOK Level 2-3
Discuss the importance of rate laws in pharmaceutical development and drug metabolism
Explore how rate laws are used in industrial processes, such as the production of ammonia
Relate rate laws to everyday phenomena, such as food spoilage or the rusting of metals
Confusing reaction order with the coefficients in a balanced equation
Thinking that a higher reaction order always means a faster reaction
Misunderstanding the units of the rate constant
Provide visual aids and graphs for visual learners
Use physical models or online simulations for kinesthetic learners
Offer tiered assignments with varying levels of complexity
Implement group work for collaborative learning
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Daily exit tickets
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Problem sets involving rate law calculations
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Lab report on an experiment to determine a rate law
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End-of-unit quiz
Textbook
Worksheets with practice problems
Lab equipment (e.g., stopwatches, spectrophotometers, chemicals for rate law experiment)
Online simulations (e.g., PhET)
Graphing software or graph paper
Whiteboard and markers