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Notebook p 29 Three Ways To Determine Density 1) Regular Objects 1. Measure the each side of the block in centimeters. Calculate volume in cm³: multiply the length x width x height. 2. Place the block on a balance and determine the mass in grams. 3. Calculate density D= m V Calculate the Density • A block of bamboo measures 7.25cm x 3.91cm x 2.55cm. The mass of the block is 28.91 g. What is the density of the block? • D = m/V Calculate the Density • A block of bamboo measures 7.25cm x 3.91cm x 2.55cm. The mass of the block is 28.91 g. What is the density of the block? • D = m/V D = 28.91 g / 7.25cm x 3.91cm x 2.55cm D = 0.40 g/ cm³ 2) Irregular Objects 1. Measure water in graduated cylinder. Add object and measure again. Calculate volume: 2nd # - 1st #. 2. Place object on balance and determine mass in grams. 3. Calculate density D= m V Calculate the Density • A sample of lead is found to have a mass of 32.6g. A graduated cylinder contains 2.8ml of water. After the lead sample is added to the cylinder, the water level reads 5.7ml. Calculate the density of the lead sample. • D = m/V Calculate the Density • A sample of lead is found to have a mass of 32.6g. A graduated cylinder contains 2.8ml of water. After the lead sample is added to the cylinder, the water level reads 5.7ml. Calculate the density of the lead sample. • D = m/V • D = 32.6 g / (5.7ml – 2.8ml) • D = 32.6 g / 2.9ml • D = 11.24 g/ml 3) Density of a Liquid 1. Place empty graduated cylinder on balance and determine the mass in grams. 2. Add liquid and read the amount to find volume. 3. Place full graduated cylinder on the balance. Calculate mass: Full cylinder – empty cylinder. 4. Calculate density D= m V Calculate the Density • A graduated cylinder has a mass of 83.20g. After 350ml of liquid mercury is added the cylinder has a mass of 4,843.20g. What is the density of the mercury? Calculate the Density • A graduated cylinder has a mass of 83.20g. After 350ml of liquid mercury is added the cylinder has a mass of 4,843.20g. What is the density of the mercury? • D = m/V • D = (4,843g – 83.20g) / 350ml • D = 4760g /350ml • D = 13.60 g/ml