Quiz on Elements, Compounds, and Mixtures/Counting Atoms in Compounds

In Na₂SO₄, how many elements are present?

• 2
• 3
• 4
• 5

What is the total number of oxygen atoms in 2H₂SO₄?

• 4
• 8
• 6
• 2

How many sodium atoms are in 3Na₂SO₄?

• 3
• 2
• 6
• 9

Which represents the correct number of atoms in 2H₂O?

• 3 total atoms
• 4 total atoms
• 6 total atoms
• 2 total atoms

In the formula 3CO₂, how many oxygen atoms are present?

• 2
• 3
• 6
• 9

How many atoms are in 2NH₃?

• 8 atoms
• 6 atoms
• 4 atoms
• 10 atoms

In 4CH₄, how many hydrogen atoms are present?

• 4
• 16
• 8
• 12

What is the first step in counting atoms in 3H₂SO₄?

• Count oxygen atoms
• Multiply by coefficient
• Add subscripts
• Count hydrogen atoms

How many sulfur atoms are in 2Na₂SO₄?

• 4
• 2
• 1
• 3

Which formula contains 12 total atoms?

• 3H₂O
• 2NH₃
• 4CO₂
• 2NO₂