There are 118 elements listed in the periodic table.Are there only 118 unique atoms in the world? Why is the relative atomic massnumbernever a whole number? 5. 教学评价 课后问题： Textbook,Chapter2:5,12,23.25,42,44,50,59,71 Chapter 3.Chemical Compounds 1.教学目标（五号宋体） Understand the properties of different chemicalcompounds and their formulas Know how to name common inorganic compounds 2. 教学重难点 教学重点： Properties of different chemical compoundsand their formulas The mole concept and chemical compounds Naming inorganic compounds 教学难点： Distinguish between molecularand ionic compounds Naming different types of inorganic compounds 3.教学内容 3-1 Types of Chemical Compounds and Their Formulas Molecular compounds Molecular formula and empirical formula Structure of molecules Ions and ionic compound 3-2 The Mole Concept and Chemical Compounds Relating molar mass,the Avogadro constant,and formula units of a compound Combining several factors in a calculation involving molar mass 3-3 Composition of Chemical Compounds Percent composition from formulas• There are 118 elements listed in the periodic table. Are there only 118 unique atoms in the world? • Why is the relative atomic mass number never a whole number? 5. 教学评价 课后问题： • Textbook, Chapter 2: 5, 12, 23, 25, 42, 44, 50, 59, 71 Chapter 3. Chemical Compounds 1. 教学目标 （五号宋体） • Understand the properties of different chemical compounds and their formulas • Know how to name common inorganic compounds 2. 教学重难点 教学重点: • Properties of different chemical compounds and their formulas • The mole concept and chemical compounds • Naming inorganic compounds 教学难点: • Distinguish between molecular and ionic compounds • Naming different types of inorganic compounds 3. 教学内容 3-1 Types of Chemical Compounds and Their Formulas Molecular compounds Molecular formula and empirical formula Structure of molecules Ions and ionic compound 3-2 The Mole Concept and Chemical Compounds Relating molar mass, the Avogadro constant, and formula units of a compound Combining several factors in a calculation involving molar mass 3-3 Composition of Chemical Compounds Percent composition from formulas