Counting Atoms (Subscripts)

Which of the following is a compound?

• Co
• O₂
• C
• CO₂

Tags

NGSS.MS-PS1-1

How many atoms are present if there is no subscript following the element symbol?

• 0

• 2

• only 1

• 1 million

How many Oxygen atoms are in H₂O?

• 1

• 2

• 0

• 4

Tags

NGSS.MS-PS1-1

How many atoms of each element are in NaCl?

• Na=1, Cl=1

• Na=2. Cl=2

• Na=1, Cl-2

Tags

NGSS.MS-PS1-1

How many elements are in... N₂O ?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many Carbon are in the compound?

• 4

• 5

• 20

• 9

Tags

NGSS.MS-PS1-1

How many atoms are there TOTAL in H₂SO₄ ?

• 6

• 5

• 7

• 3

Tags

NGSS.MS-PS1-1

How many elements are present in this compound? (Careful!)

Mg₂As₃COHNi₂

• 2

• 4

• 6

• 10

Tags

NGSS.MS-PS1-1

How many Nitrogen atoms are in the in H₂C₃O₄N₅?

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)

• H₃SO₄
• HSO₄
• H₄S₃O
• H₂O

Tags

NGSS.MS-PS1-1