Teacher Notes


Teacher Notes
Publication No. 11837
Earth Science DensityStudent Laboratory KitMaterials Included In Kit
Aluminum cubes, 2
Aluminum bar Glass sphere (Sphere 1), 14 mm Glass sphere (Sphere 2), 19 mm Plastic ruler, metric Additional Materials Required
Water
Balance, accurate to 0.1 g Graduated cylinder, plastic, 50 or 100mL Mineral or rock samples, various types, 3 DisposalAll materials may be saved for future use. Teacher Tips
Correlation to Next Generation Science Standards (NGSS)^{†}Science & Engineering PracticesPlanning and carrying out investigationsDisciplinary Core IdeasMSPS1.A: Structure and Properties of MatterHSPS1.A: Structure and Properties of Matter Crosscutting ConceptsPatternsPerformance ExpectationsHSPS13. Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles. Sample DataData Table 1 {11837_Data_Table_1}
Data Table 2
{11837_Data_Table_2}
Data Table 3
{11837_Data_Table_3}
Answers to QuestionsPart 1. Density of Bar and Two Cubes
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Student Pages


Student PagesEarth Science Density KitIntroductionHow is density measured? What factors are involved in finding the density of objects of different sizes, shapes and composition? Several experiments will be performed in this activity to answer these questions. Concepts
BackgroundIn this activity, the mass, volume, and density of several objects will be determined and compared by two methods: direct measurement and water displacement. In Part 1, the volume of two cubes and a bar will be calculated using Equation 1. The length, width, and height will be measured using a metric ruler {11837_Background_Equation_1}
The mass of the three objects will be found using a balance and the density of each object will then be calculated using Equation 2.
{11837_Background_Equation_2}
Density, which is defined as an object’s mass divided by its volume, is a characteristic property of a material. Solids that have the same physical appearance or objects of different shapes and sizes may be identified by their densities. The density of a solid is commonly expressed as g/cm^{3}. In Part 2 of this experiment, the volume two spheres of different sizes will be determined by water displacement. Using Equation 3, the volume of each sphere may be calculated. {11837_Background_Equation_3}
{11837_Background_Figure_1}
The mass and volume of the spheres will then be used to determine the density and identity of each sphere. In Part 3 of this activity, the density of unknown rock samples will be found using the water displacement procedure from Part 2. Materials
Water
Balance, accurate to 0.1 g Bar Cube 1 Cube 2 Graduated cylinder, plastic, 50 or 100mL Mineral samples Plastic ruler, metric Sphere 1, 14 mm Sphere 2, 19 mm Safety PrecautionsAlthough this activity is considered nonhazardous, always follow proper laboratory safety procedures. ProcedurePart 1. Density of a Bar and Two Cubes
Student Worksheet PDF 