This learning resource is designed to help students understand the concept of density, specifically how to calculate it using the formula D = m/v (Density = Mass/Volume). The goal is for students to be able to calculate density and explain its significance in identifying substances. The resource provides a method for finding density, detailing the importance of units (grams for mass and cubic centimeters for volume). It includes a practical challenge case where students calculate the density of an unknown metal cube, followed by a reference list of known substances and their densities. Students are encouraged to justify their reasoning regarding how density helps in identifying materials.