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

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NGSS.MS-PS1-1

How many elements are in this chemical formula?

HCl

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-1

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

• 6

• 1

• 12

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NGSS.MS-PS1-1

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

• Iron, Oxygen

• Francium, Europium, Oxygen

• Ferrium, Oxygen

• Berylium, Oxygen

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NGSS.MS-PS1-1

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

• 2

• 4

• 3

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NGSS.MS-PS1-1

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

• 4

• 3

• 2

• 6

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

• 18

• 12

• 25

• 24

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NGSS.MS-PS1-1

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

• Silver

• Gold

• Nitrogen

• Oxygen

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NGSS.MS-PS1-1

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

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

Tags

NGSS.MS-PS1-1