Chapter 6

Chemical Composition

Element Song

• 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

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.