This resource is explicitly designed to build towards this science and engineering practice.
Comments about Including the Science and Engineering Practice
During Part 1, the students use their graph, a text, and peer-discussion of the graph to develop and refine their idea of equilibrium. The teacher should use the exercise to address the misconception that equilibrium does not mean equal amounts using the data in Part 1. In Part 2, student may find it easier to label each test tube by number, and with a description of what is being added. The qualitative data that students collect in Part 2 provides them with the evidence they need to construct an explanation of Le Chatelier’s Principle, utilizing the equations and predictions provided in the introduction. Teachers will need to support the evolution of Le Chatelier's concept extending it to variables of pressure and temperature, and lead students towards using it to make predictions.