Exam (Elaborations) Student Exploration Diffusion

Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary : absolute zero, controlled experiment, diffusion, dynamic equilibrium, Kelvin scale, kinetic energy Prior Knowledge Question (Do this BEFORE using the Gizmo .) Have you ever smelled microwave popcorn? The oddly enticing scent can fill a whole house. How do you think the smell of popcorn spreads through the air? Gizmo Warm-up Smells are carried by tiny particles that move through the air. The Diffusion Gizmo shows gas particles in a chamber that is divided into two regions by a partial wall. Click Play ( ) and observe. 1. Describe the motion of the gas particles. 2. Over time, what is happening? This process, in which particles move from an area of high concentration (region A ) to an area of low concentration (region B ), is called diffusion . 3. Select the BAR CHART tab, and observe the chart for a few minutes. After the first 30 seconds or so, how much do the numbers of particles in each region change? Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved Name: Date: Tuesday, February 16, 2021 Through the process of diffusion, the particles of the smell spreads around the house by bouncing off the walls, traveling from a high concentration to a low. The motion of the gas particles in region A are moving fast and bounce back off the partial wall until they get into region B. They still continue to bounce back and forth into region A and B. The amount of gas particles in each region is starting to balance out with each other gradually. The number of particles in region A is gradually lowering from 50 to 38 in just around 30 seconds. At the 30 seconds mark region A has 38 particles and region B has 12. Just by this observation, I can tell that around the 60 second mark the number of particles in region A and B are going to be very similar.