1. Identify each of the following statements as being most similar to a hypothesis, a law, or a theory. Explain your reasoning. (a) Falling barometric pressure precedes the onset of bad weather. (b) All life on earth has evolved from a common, primitive organism through the process of natural selection. 2. Identify each of the underlined items as a part of either the macroscopic domain, the microscopic domain, or the symbolic domain of chemistry. For any in the symbolic domain, indicate whether they are symbols for a macroscopic or a microscopic feature. (a) The mass of a lead pipe is 14 kg. (b) The mass of a certain chlorine atom is 35 amu. (c) A bottle with a label that reads Al contains aluminum metal. (d) The bottle contains 15 grams of Ni powder. 3. How does a homogeneous mixture differ from a pure substance? How are they similar? 4. A sulfur atom and a sulfur molecule are not identical. What is the difference? 5. Classify each of the following changes as physical or chemical: (a) condensation of steam (d) dissolving of sugar in water (e) melting of gold (f) magnetizing of a screwdriver (b) burning of gasoline (c) souring of milk 6. Identify the following properties as either extensive or intensive. (a) (a) volume (d) heat (b) temperature (e) boiling point (c) humidity 7. Express each of the following numbers in scientific notation with correct significant figures:
