Chemical Reactions (Part B): Factors Affecting Reactions (Reaction Rate and Equilibrium)
Overview/Rationale
In this unit students learn that effective collisions between reactants with sufficient energy leads to a chemical reaction where products are formed. Many other factors determine the completion of a reaction, including the rate of a reaction, chemical equilibrium and limiting reactants.
Student Objectives
● List the criteria for effective collisions that yield the required products in a chemical reaction.
● Analyze an energy diagram, including activation energy, for endothermic and exothermic reactions.
● Identify the factors that influence the rate of a chemical reaction.
● Describe chemical equilibrium as a dynamic, reversible state in which rates of opposing processes are equal.
● Identify the stresses that can change the equilibrium position of a chemical reaction.
● Apply Le Chatelier’s principle to determine the product yield in a chemical reaction.
● Describe the role of limiting reactants in determining the product yield.
Vocabulary:
Collision theory, activation energy, energy diagram, reaction rate, chemical equilibrium, Le Chatelier’s principle, limiting reactant, excess reactant, product yield
Department Activities:
1. Modelling Chemical Equilibrium with Straws Lab- https://drive.google.com/drive/folders/0B0XImXxS1gxJMzBtcHl5anNwR1U
2. Analyzing Energy Diagrams to determine rate of a reaction and overall energy requirements.
3. Reaction rate lab: (HS-PS1-5) https://drive.google.com/drive/folders/0B0XImXxS1gxJMzBtcHl5anNwR1U
4. Le Chatelier’s Principle Class Lab: https://drive.google.com/drive/folders/0B0XImXxS1gxJMzBtcHl5anNwR1U
Additional Activities:
5. The Iodine clock reaction: Prentice Hall Lab Manual. Study the effect of concentration on reaction rates.
6. Factors affecting the reaction rate: Prentice Hall Lab Manual, Pg:225. (Honors)
7. Effect of limiting reactants on the product yield in a chemical reaction: Pearson
8. Quick lab: Measuring Reaction rate using effervescent tablets. (HS-PS1-5) Holt Chemistry: https://drive.google.com/open?id=0B0XImXxS1gxJVi02QlVHbjFqOXc
9. Demo: Reversible reactions: Holt
10. Change in rate of a reaction over time: Holt Chemistry (TE) Pg:592 (Honors)
11. Effect of different catalysts on reaction rate: Small-scale lab. Holt Chem (TE), Pg:604 (Honors)
12. Describing reaction rates Lab Activity:Pearson, Pg:600
13. Le Chatelier’s Principle Lab: Examining the temperature effect. Pearson (TE): https://drive.google.com/open?id=0B0XImXxS1gxJZ19tclFReW5RN1E
14. Introduction to Limiting reactants using models: Class Activity, Pearson: https://drive.google.com/open?id=0B0XImXxS1gxJcS16SzZMVGJBSFE
15. Limiting reactants lab: Pearson: https://drive.google.com/open?id=0B0XImXxS1gxJVGMxMnpmN3NINm8
16. Effect of temperature on reaction rate: Pearson AGS, Pg:624.
17. How a catalyst affects a Chemical reaction? Pearson AGS Globe: https://drive.google.com/open?id=0B0XImXxS1gxJVjQxcl81dm5lYjg