1. Chapter 6 Chemical Composition

2. Element Song Memorize for Extra Credit– 3 points toward your worst test grade – You may video tape yourself singing it – You may sing it live to the class – Due anytime before Thanksgiving break

3. Targets I can: – Define average mass and show how counting can be done by weighing. – Explain atomic mass and its experimental determination. – Define the mole concept and Avogadro’s number and convert among moles, mass, and number of atoms in a sample. – Define molar mass. – Convert between moles and mass of a given sample of a chemical compound. – Find the mass percent of an element in a compound. – Define the meaning of empirical formulas. – Calculate empirical formulas. – Solve for the molecular formula of a compound, given its empirical formula and molar mass.