1. Density Practice Quiz!!

2. Practice Density Problem #1 Students doing a lab started with 30 ml of water in a graduated cylinder. They added an object to the graduated cylinder and recorded the new water level as 75 ml. If the mass of the object is 160 grams, then what is the density of the object?

3. V water = 30 ml V water & object = 75 ml V object = 75 ml - 30ml = 45 ml M = 160 g D = ? D = M/V D = 160 g/45 ml = 3.56 g/ml

4. Density Problem #2 An object has a radius of 2.5 cm and a length of 6.8 cm. What is the object’s density if it has a mass of 1205 g?

5. r = 2.5 cm L = 6.8 cm M = 1205 g D = ? V = πr 2 h V = π(2.5cm) 2 (6.8 cm) V = 133.5 cm 3 D = M/V D = 1205 g/133.5 cm 3 D = 9.03 g/ cm 3

6. Density Problem #3 What is the mass of an object with a diameter of 3.60 cm and a density of 4.50 g/cm 3 ?

7. d = 3.60 cm r = (3.60 cm)/2 r = 1.80 cm V = 4/3(πr 3 ) V = 4/3(π(1.80 cm) 3 ) V = 24.4 cm 3 M = ? M = D*V M = (4.50 g/cm 3 )*(24.4 cm 3 ) M = 109.8 g