1. what unit would you use if you were measuring the average kinetic energy of a substance? a) joules b )calories c) celsius d) watts 2. convert 5.8 km to the unit mm. a) 0.0000058 mm b) 0.0058 mm c) 5,800 mm d) 5,800,000 mm 3. the density of a sample of metal is calculated using these three different sets of data: 2.9 g/ml, 2.8 g/ml, and 3.0 g/ml. if the true density of the metal is 2.1 g/ml, what can be said about these calculated density values? a) the set is both accurate and precise. b) the set is accurate but not precise. c) the set is precise but not accurate. d) the set is neither accurate nor precise. 4. which statement best represents scientific laws? a) scientific laws are statements that contain scientists' opinions of how the world works. b) scientific laws are factual statements that explain why certain natural phenomena occur. c) scientific laws are theories that have been tested, proven, and adopted as laws. d) scientific laws are descriptions of observed phenomenon, generally accepted as facts. 5. a scottish chemist thomas graham observed and experimented with gas particles in the 1800s. he formulated a mathematical equation that describes the relationship between the mass of a gas molecule and its rate of effusion. this relationship is a) law because it describes what happens without explaining why. b) law because it is based on mathematics. c) theory because it describes a relationship. d) theory because it is a description without an explanation.