How can we explain the effect of a lid on changes in the amount of matter in a cup over time?
- Do Now– Get out your ISN and add to the Table of Contents- “Particulate Matter” p.39 (Right Side). Head p.39 properly with “Particulate Matter- 11/18/19.″
- Introducing New Science Ideas– A few investigations back, we put liquids of different temperatures in a cup with a lid and a cup without a lid. We used a loss in mass to figure out that something left the cups in both systems, although more mass was lost in the cup without the lid. We represented what was happening between the liquid water & the air (gas) with a model using different colored chips. But this only represented part of the system- we need to represent the solid lid and walls of the cup too. If we don’t understand how particles behave in a solid, we won’t understand how putting a lid on the cup reduces the loss of mass in that cup. So I’d like to help you now with something called the particulate nature of matter. Take notes on ISN p.39 about liquids, gases, & solids.
- Developing & using a diagrammatic representation of particles– When we try and show how the particles in the cup systems are interacting in future models, we won’t always have manipulatives like chips to work with. Many times we need to represent our thinking on paper. One way to do this is to draw the particles that make up the solid, liquid, & gases as circles. Use the handout “Particle Representations for Matter in the Cup System.” Observe the left side of the handout with the key and the diagrams of the cups. Now look at the zoomed in circle A. Discuss the question as a full class. Summarize the answer and write it next to the question. Now look at parts B and C and repeat the process. represent particle movement with three lines. Add this to the single water vapor particle in the key- “moving through air.” Update the zoomed in view for B & C to show movement of water vapor particles. Finally, with your partner complete parts D and E- answer the questions and draw a molecular model for E.