Dreading starting your stoichiometry unit? While the logic of dimensional analysis is tried and true for solving any type of stoichiometry problem, it is not intuitive for many students. The multi-step "train track" method of canceling out units reduces the process to "plug-and-chug", and conceptual understanding is often lost. Students can lose sight of the foundation of stoichiometry itself: the balanced equation, and the chemical reaction it represents.
This sample presentation introduces the method I use in my class -- The Initial-Change-After method. It is modeled after the ICE table that us used in equilibrium. The balanced equation is the foundation of the method. Even my weakest students have had great success with this method.
• Emphasizes mole relationships explicitly based on the coefficients of the balanced chemical equation
• Gives students a platform to reason through stoichiometry
• Sets the stage for a more intuitive approach to solving limiting reactant problems
• Sets up students for equilibrium calculations later
This free version only includes a walk-through approach to the method, using a mole-mole problem, and a walk-through practice problem using a mole-mass problem.
The full paid-version of the lesson, including limiting reactants will be available in early June.