Counting Atoms

What does the LITTLE NUMBER 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

Tags

NGSS.MS-PS1-1

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

• 6

• 1

• 12

Tags

NGSS.MS-PS1-1

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

• Iron, Oxygen

• Francium, Europium, Oxygen

• Ferrium, Oxygen

• Berylium, Oxygen

Tags

NGSS.MS-PS1-1

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

• 2

• 4

• 3

Tags

NGSS.MS-PS1-1

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

• 4

• 3

• 2

• 6

Tags

NGSS.MS-PS1-1

Which of the following is a molecule of a compound?

• H20

• Cl

• Mg

• Fe

Is this an element or a molecule?  $CaSO_4$  

• Element

• Molecule

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

• niF2

• NIF₂

• Ni₁F₂

• NiF₂

Tags

NGSS.MS-PS1-1

What is the total number of atoms in this chemical formula? $C_8H_3NaBr_{12}$  

• 18

• 12

• 25

• 24

Tags

NGSS.MS-PS1-1