Reaction Rate – Why Wait? Lisa Devillez

Chapter by Chapter : Is there a better way? Standard texts –Building foundations through details –Working towards the big picture

Understanding the big picture first Chemistry in Context (ACS) –Planted the seed –Combine foundational concepts with context Preempts “Why are we learning this?” Better match with my learning style

Reaction Rate in Core Content SC-HS Students will: identify variables that affect reaction rates; predict effects of changes in variables (concentration, temperature, properties of reactants, surface area and catalysts) based on evidence/data from chemical reactions. Rates of chemical reactions vary. Reaction rates depend on concentration, temperature and properties of reactants. Catalysts speed up chemical reactions. DOK 3

Reaction Rate Up Front: Why it Works Provides a context for foundational concepts –Particle nature of matter ↔ Collision Theory –Physical Change ↔ Chemical Change –Intro to Nomenclature and Models –Endothermic vs. Exothermic

Reaction Rate Up Front: Why it Works Innocuous Labs –Vinegar and Baking Soda –Decomposition of H 2 O 2 Easily adapted for inquiry Opportunities for data collection and analysis

Reaction Rate Up Front: Why it Works Real World Applications –Catalysts (Fuel cells, Grubbs catalyst) –Catalytic Converters –Ozone Layer Depletion –Enzymes

An extra benefit

Putting It All Together: Unit Objectives Be able to relate the collision model to variables and their effect on reaction rate. Explain graphically the concept of reaction rate. Use an energy diagram to determine the thermodynamics of a reaction (endothermic vs. exothermic, ∆E, activation energy)

Unit Objectives (continued) Describe the theory of how a catalyst works. Apply this theory to the function of the catalytic converter in your car. Understand the role of enzymes in biological reactions. Understand the role of catalysts in depletion of the ozone layer

Unit Resources