Phase: | After/Explain/Elaborate |
Activity: | The students will complete the Sublimation of Dry Ice Laboratory to explore and understand transitions between different states of matter, in this case, a solid phase-changing directly into a gas. The students will follow a step-by-step procedure for seven mini laboratories to explore the concept of sublimation. As a class, the students will watch a video from Science Friday called “How to Make Fizzy Fruit”. This video will introduce the students to dry ice and be used to discuss dry ice and its properties. The students will then use dry ice, warm water, liquid soap, food coloring, spoons, rubbing (isopropyl) alcohol, balloons, lab gloves, flowers and leaves to explore the concept of sublimation of dry ice. The students will follow the procedure, answer extension questions on each activity, apply their knowledge to another compound, and complete a conclusion paragraph of the laboratory to demonstrate their understanding. It is attached below. The Sublimation of Dry Ice Student Procedure This document provides procedures for teachers to follow to set up and implement the lab activities: |
Assessment Strategies: | The teacher is provided various prompts throughout the laboratory to ask the class or individual students to check student understanding of the properties of matter and the process of sublimation. These questions/prompts are given in the teacher procedure (in italics). These questions will help to formatively assess the students throughout the laboratory. The students will complete the extension questions, application questions, and conclusion, and the teacher can summatively assess student understanding using their answer document. |
Advanced Preparation: | The students will need to have a prior understanding of the states of matter and the processes of phase changes, melting, freezing, evaporation, condensation, and sublimation. The teacher will need to gather dry ice, beakers, newspaper, ice cubes, graduated cylinders, warm water, liquid soap, food coloring, spoons, rubbing (isopropyl) alcohol, balloons, lab gloves, flowers, and leaves in order for the students to complete the investigations. The student procedure will need to be copied for each student or laboratory group. |
Variation Tips (optional): | The teacher can use this activity as a teacher-led activity or it can be given as a student-driven activity. The students can complete the laboratory in its entirety or only specific activities. The teacher could also delete the "What's Happening" section of the procedure, design an extension activity rubric, and have students complete research to tell what is happening in the laboratory. |
Notes or Recommendations (optional): |
Keywords and Search Tags: | dry ice, phase change, properties of matter, sublimation |