By the Exam… Know the polyatomic ions and charges (Table 5.4). Know common ions and symbols (Tables 5.1 and 5.2). The charges for these come from the periodic table. Know prefixes (Table 5.3).

Clicker #1 What is the average mass of one hydrogen atom? A) 1.008 amu B) 1.008 g C) 1.008 moles D) Both A and B are correct.

Clicker #2 How do these two numbers compare? A) # of H atoms are less than the # of C atoms B) # of H atoms are equal to the # of C atoms C) # of H atoms are greater than the # of C atoms D) I have no clue. Help!

Clicker #3 Which sample contains a greater number of atoms? 10.0 g Cu or 10.0 g Mg A) 10.0 g Cu B) 10.0 g Mg