1. Which of the following is a homogeneous mixture? Which of the following represents a chemical change, rather than a physical change? Which of the following pairs of symbol & element is incorrect? Which of the following is a method used to separate components of a mixture? What is the value of X, rounded to the proper number of significant figures, in the calculation below? It is 30 C outside. What is the temperature in F? A) 49 B) 86 C) 112 D) 1 E) 303 The density of silver is 10.5 g/cm3. A piece of silver with a mass of 61.3 g would occupy what volume (in cm3)? [More difficult]. 8. Which of the following represents a chemical property? How many seconds does it take light to travel from the moon to earth, given that the earthto-moon distance is 2.301 105 miles, 1 mile = 1.609 km and the velocity of light is 2.998 108 meters/sec?