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 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

How many more atoms of Oxygen than than Magnesium are in this formula? $MgSO_4$  

• 4

• 3

• 2

• 6

Which does not belong in the group?

• Sodium

• Glucose

• carbon

• Element

Is this an element or a compound?  $CaSO_4$  

• Element

• Compound

Which chemical formula correctly displays 1 atom of nickel and 2 atoms of Fluorine?

• niF2

• NIF₂

• Ni₁F₂

• NiF₂

How many elements are in this chemical formula?  $NaHCO_3$  

• 1

• 2

• 3

• 4