Study Guide for Exam 2 Chapter 3: Molecules, Compounds, and Chemical Equations Sections: 3.2-3.11 Important Questions and Concepts: . What are ionic and covalent bonds? . How do we represent compounds? What is the difference between a molecular formula and an empirical formula? What is a structural formula? How do we show the 3D structure of a molecule? What is the difference between an element, molecular element, ionic compound, and molecular compound? How do we write the chemical formula for ionic compounds? What is the naming scheme for ionic compounds? What is the naming scheme for molecular compounds including acids? molar mass of a compound? . What is the formula mass of a compound? How is it related to the How do we calculate the mass percent of elements in a compound? . What are the steps when calculating an empirical formula? What q tities are needed and in what units? . How is the empirical formula related to the molecular formula? chemical equation be balanced? Additional Practice Problems: 23, 30, 31, 33-46, 47-54, 63, 69, 79, 81, 85, 89, 91, 101, 102, 119, and 121 & Challenge Problems: 143 and 151
