chem 120 exam 1 Questions And Answers

The metric prefix which means 0.01 (one-one hundredth) is centi How many meters are in 1 kilometer? 1000 The amount of matter in an object is its mass Which of the following has the largest density? 1.8 g object with a volume of 1.0 mL A piece of metal is believed to be either platinum (valuable) or nickel (not so valuable). One way to decide is to calculate the density. The piece of metal is found to have a mass of 156.485 g. The piece of metal has an odd shape, so geometry cannot be used to calculate the volume. Instead, the volume is determined by seeing how much water it displaces: 51.2 mL of water is placed in a container. The metal piece is dropped in, and the water level rises to 58.5 mL. What is the density of the metal? 21.4 g/mL Aluminum has a density of 2.7 g/mL. Gold has a density of 19.3 g / mL. Which is larger (has a greater volume), 1 gram of aluminum or 1 gram of gold? 1 g aluminum The atomic number of an atom is equal to the number of protons in the nucleus Isotopes have the same number of protons but different neutrons The mass number is equal to the sum of the number of protons and neutrons. An element has a mass number of 37 and 17 electrons. How many protons are present? 17 An element has a mass number of 37 and 17