Questions 1. State the number of significant digits in each of the following measurements. a) 35 s c) 0.5 s e) 23.0 s b) 30.5 C d) 20.5 cm^3 f) 10.00 mL h) 0.015 g j)-2.0 C g) 21.50 s i) 15.0 cm^3 2. Perform the indicated math operations and round the answer to the proper significant digits. a) 50.6 g 50.050 g 50.231 g 1508819 + Neptunium Nickel Osmium Zinc Lead b) 3. A flask with a stopper has a mass of 79.310 g. A 25.0 ml sample of an unknown organic liquid is pipetted into the flask and has a total mass of 97.010 g. Find the density of the unknown liquid. 20.4 8.9 4. A sapphire has a mass of 5.250g. When the gem is dropped into a graduated cylinder, the volume increases from 47.5 mL to 49.0 mL. What is the density of the sapphire? 22.6 7.1 11.4 2 56.05 cm cm - 11.4 5. Liquid mercury has a density of 13.6 g ml-1. Which of the following substances will float on mercury, and which will sink? Density, g mL-1 12 44.65