Lab 3: Density m3 To determine the density of objects. fnr in: All matter has mass and volume. Mass and volume are physical properties of matter and may vary with different objects. For example, it is possible for two pieces of metal to be made out of the same material yet for one piece to be bigger than the other. If the first piece of metal is twice as large as the second, then you would expect that this piece is also twice as heavy (or have twice the mass) as the first. If both pieces of metal are made of the same material the ratio of the mass and volume will be the same. We dene density (p) as the ratio of the mass of an object to the volume it occupies. The equation is given by: M 9:? here the symbol M stands for the mass of the object. and Vfor the volume. Density has the units of mass divided by volume such as grams per centimeters cube (gfcm3) or kilograms per liter (kgfi). Sampfe Problem #1 A block of wood has a mass of 8 g and occupies a volume of 10 cm3. What is its density? Solution 3:; The density will be 10cm" = 0.8gh'nt" This means that every centimeter cube of this wood will have a mass of 0.8 grams. Unlike the mass and volume that may be different for each specimen. all objects made of the same material will have the same density. Because of this the density is often used to identify unknown substances or to determine the percent composition. The densities of various substances are given in Table 1. Part 1: Densities of Regularly Shaped Objects Use the following information to complete Table 2. Table 1 will help you to identify the objects (composition) Cube: side length = 3.2 cm, mass = 256.6g Cylinder: Diameter = 2 cm, height = 9 cm, mass = 22.3 g Sphere: Diameter = 2.5 cm; mass = 68.8 g Find the volume of the objects with regular shape using the standard equations provided below: H Sphere Cube Cylinder V = . n . R3 V = L . W . H V = n . R2 . H Table 2 Item Mass (g) Volume (cms) Density Composition (g/cm) Cube Cylinder Sphere Part 2: Densities of mystery objects https://phet.colorado.edu/sims/density-and-buoyancy/density_en.html 3Discussion & Conclusions 1. How condent are you in your determination of composition of the materials? Explain. 2. In a real experiment. what could be possible sources of error in carrying out such an experiment? 3. Which of the mystery objects from part 2 will float in the liquid of part 3