Chemical Formulas and Atom Counting

Use the formula for two molecules of zinc nitrate to answer the questions below: 2Zn(NO₃)₂

• 3

• Number of different elements?

• 6

• Coefficient number

• 16

• Number of Zinc atoms

• 2

• Number of Oxygen atoms

• 2

• Total number of atoms in the compound

Tags

NGSS.MS-PS1-1

Use the formula for ammonium sulfate to answer the questions below: (NH₄)₂SO₄

• 4

• Number of total atoms

• 15

• Number of oxygen atoms

• 2

• Number of nitrogen atoms

• 4

• Number of different elements

Tags

NGSS.MS-PS1-1

Use the formula for sucrose (a type of sugar) to answer the questions below: C₁₂H₂₂O_11.

• 3

• Number of total atoms

• 11

• Number of different elements

• 45

• Number of oxygen atoms

• 22

• Number of hydrogen atoms

Tags

NGSS.MS-PS1-1

Which of the following formulas contain four atoms of hydrogen? Choose two correct answers.

• 2H₂CO₃

• H₂O₂

• C₂H₆

• C₂H₄O₂

• 2NH₃

Tags

NGSS.MS-PS1-1

A ___________ tells how many molecules are present in a chemical formula.

• subscript

• coefficient

A ___________ tells how many atoms of each element are present in a chemical formula.

• subscript

• coefficient

How many atoms of Hydrogen (H) are on the Reactants side of this equation?

(a)  

Tags

NGSS.MS-PS1-1

How many elements are on the Product side of this equation?

(a)  

Tags

NGSS.MS-PS1-1

How many total atoms are found on the Product side of this equation?

(a)  

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Match the following to the number of atoms it contains.

• O

• 12 atoms

• Al

• 2 atoms

• S

• 3 atoms

Tags

NGSS.MS-PS1-1