4. Lesson 4: Modeling Bond Formation

Carole Namowicz, Shruti Researcher
Chemistry
50 min
High School
v5
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Overview

A synthesis reaction: Zn + I2 → ZnI2 will be demonstrated for the class using varying amounts of the reactants (all in correct molar ratios) so students can observe that bond formation is exothermic, and that more reactants used leads to a greater temperature increase.

Students will compare and contrast bond breaking and bond making and be provided with definitions for endothermic and exothermic. They will then model bond formation with their table groups including the PE/KE of the system/surroundings before and after.

Underlying Pages

Standards

Next Generation Science Standards
  •   Physical Science
    • [HS-PS1-4] Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.
    • [HS-PS3-2] Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as a combination of energy associated with the motions of particles (objects) and energy associated with the relative positions of particles (objects)
Computational Thinking in STEM
  •   Data Practices
    • Collecting Data
    • Creating Data
    • Manipulating Data
    • Visualizing Data
    • Analyzing Data
  •   Modeling and Simulation Practices
    • Assessing Computational Models
    • Using Computational Models to Understand a Concept
  •   Systems Thinking Practices
    • Communicating Information about a System
    • Investigating a Complex System as a Whole
    • Thinking in Levels
    • Understanding the Relationships within a System
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