Counting Atoms

What does the subscript in a chemical formula tell you?

• How many molecules are present

• How many atoms are present

• How many elements are present

• How many neutrons are present

How many different elements are in this chemical formula?

HCl

• 1

• 2

• 3

• 4

How many atoms of Carbon are in this formula? $C_{6\ }H_{12}O_6$  

• 6

• 1

• 12

What elements are represented in this chemical formula?  $Fe_2O_3$  

• Iron, Oxygen

• Francium, Europium, Oxygen

• Ferrium, Oxygen

• Berylium, Oxygen

What is the TOTAL number of atoms in this formula? $H_2O_2$  

• 2

• 4

• 3

Which element has the greatest number of atoms?  $AgNO_3$  

• Silver

• Gold

• Nitrogen

• Oxygen

How many Hydrogen atoms are in 4H₂O?

• 6

• 8

• 2

• 4

4 Fe + 3 O₂ ----> 2 Fe₂O₃ What is/are the product(s)?

• ------>

• 4Fe

• 2Fe₂O₃

4 Fe + 3 O₂ ----> 2 Fe₂O₃ What is/are the reactant(s)?

• ----->

• 2H₂O

• 4 Fe + 3 O₂

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4