Drawing on the Gas Laws

I recently wrote about a quiz question that asked students to solve limiting reactant problem that depended on a picture , including they needed to draw their solution. Most of my students had mastered the math and sailed through the calculation part of my quiz but then struggled with the drawing task. We have moved on now to gas laws, so, when it was again quiz time, I included another drawing item. This time used a box of dots to represent the particles in a sample of gas. I asked students to draw me a picture that would represent the particles in a sample with twice as much pressure. I was checking to see if they understood the model and also if they understood the relationship between gas pressure and the other properties of volume, temperature and number of particles. Here are some sample student responses: These two are essentially the same, but I like them both for different reasons. The first with its solid demonstration ...