Lab-Aids: Changing of Equilibrium (Le Chatelier’s Principle) Refresh-A-Kit

Lab-Aids: Soil Composition and Structure Kit In this companion kit to the Introduction to Soil Kit LAB-1101, elementary students continue their exploration of soil. In the first activity, students describe a soil sample, then identify the similarities and differences between their group's descriptions and those of other groups and develop a primary definition of soil. Activity 2 expands the investigation of soils by using a water column to separate soil samples into various components. This data provides more evidence on the types and proportions of the different materials in each soil and allows students to refine their previous definition of soil. Activity 3 is a reading which provides information that expands their personal experience and observations from the previous activities to deepen and refine their understanding of the composition, structure and development of soil.   Content List: 18 9-oz plastic cups 12 magnifying lenses 12 15-cm metric rulers 12 clear plastic tubes with caps 12 3x5 index cards 8 plastic teaspoons 6 sieves 6 50-mL graduated cylinders and bases 6 30-mL graduated cups 6 AB trays 1 32-oz. bottle of Soil A 1 32-oz. bottle of Soil B 28 Student Worksheet and Guides: How to Measure Length Using a Metric Ruler 28 Student Worksheet and Guides: Measuring Volume With a Graduated Cylinder 28 Student Worksheet and Guides: Soil Composition and Structure 1 Teacher's Guide 1 Material Safety Data Sheet (MSDS) packet 1 Transparency: Comparing Particle Size Classroom Planning: Number of Students: 24 (maximum 6 groups per period) To complete the three activities in this kit requires three to four ~50-minute class periods