Counting Atoms

How many hydrogen (H) atoms are in 4H₂O?

• 6

• 8

• 2

• 4

How many different elements are in C₆H₁₂O₆?

• 1

• 2

• 3

• 4

How many atoms are there TOTAL in:

H₂SO₄

• 6

• 5

• 7

• 3

How many Sodium (Na) atoms are in 6NaCl?

• 1

• 12

• 6

• 7

Which is the correct formula for:

three hydrogen (H)

one sulfur (S)

four oxygen (O)

• H₃SO₄

• HSO₄

• H₄S₃O

• H₂O

How many carbon (C) atoms are in this compound?

H₂C₃O₄N₅

• 2

• 3

• 4

• 5

A subscript is the small number below a(n) ________ that tells the number of _______ of that element.

• element symbol; atoms

• atom; element symbol

• subscript; protons

• compound; elements

What is a coefficient?

• The small number on the right of the chemical symbol.

• The large number to the left of a formula.

How many oxygen (O) atoms are in H₂O?

• 1

• 2

• 0

• 4

How many Magnesium atoms are in 10MgCl₂?

• 10

• 5

• 20

• 1