CP Chemistry Midterm Review List Substance: element & compound ? water, Aluminum, ethanol, carbon dioxide Homogeneous vs. Heterogeneous Physical & Chemical Properties & changes: Freezing/melting, boiling/condensing ;State Change (melting point) Burning/ rusting Metric system: Units, prefixes (kilo-milli), and conversions one milliliter equals 1 cm3 325 mg can be expressed in grams Temperature scales & conversion - Celsius temperature is equivalent to 298K Accuracy vs. precision Scientific Notation & Significant figures 149,000,000 Percent error A molar mass of a compound is 75 g/mol. A student reported an experimental value of 78 g/mol. The percent error is Density