|
    |
Unit 1: Introduction to Scientific Methods Lesson 4: Comparing Water Ice and Dry Ice Objectives: After completing the lesson, students will
be able to: Key Question: "How does water ice compare to dry ice?" Overview: Students are given an opportunity to examine the behavior of water ice and dry ice, and write down what they observe. The teacher then leads a demonstration in which energy, in the form of heat, is added to both water ice and dry ice. Again, students are to write down their observations into their scientific journals. Finally, the session ends with an introduction to the phrase "nullius in verba," which loosely translates into "don't take anybody's word for it." The ensuing discussion focuses on a key theme of doing science: explanations of how the world works must be based on objective observations that can be repeated by others, not on prior assumptions. Time Required: 45-60 minutes (1 class session). Materials: Procedure: see pp. 26-33 in Dry Ice. Assessment: student responses to the Scientific Journal pages, "As If Seeing It for the First Time," "Comparing Substances," and "Adding Energy." Homework: OUSD Science Content Standards (State of California Science Content Standards):
Notes: This is the first lesson that requires the use of dry ice. It is necessary, before beginning this lesson, that students understand the importance of working as a team in a safe manner. It is a good idea, therefore, to read the information about obtaining and handling dry ice in a safe manner, found on pp. 7-9 in Dry Ice. Two sources for obtaining dry ice in Oakland are: A-1 Arco AM/PM Gas Station Praxair Dry Ice Obviously, there can be some hassles with obtaining dry ice at a given school site. One cannot underestimate the excitement and interest level demonstrated by 6th grade students when doing dry ice experiments. However, if obtaining and working with dry ice proves to be too insurmountable a barrier at a given site, it is possible to meet the curriculum goals for this section of Unit 1 by substituting experiments outlined in the Oobleck and/or Bubbleology GEMS guides (available through the Lawrence Hall of Science) for the lessons that require dry ice outlined here. Unit 1 Introduction amnd Overview Lesson 1: Laboratory Safety and Classroom Management Lesson 2: Observation and Inference Lesson 3: Introduction to Observation Lesson 4: Comparing H2O to CO2 Lesson 7: Marge's Systematic Observation Lesson 10: Investigable Questions Lesson 11: Planning an Investigation Lesson 12: Conducting Investigations Lesson 15: Layering Salt Solutions Lesson 16: Density in Everyday Life Lesson 17: Observing Convection Lesson 18: Understanding Convection Lesson 20: Intro to Measurement |
