Counting Atoms in Chemical Formulas

Multiple Choice

The small numbers under and to the right of element symbols in a formula are called _________________.

• element symbols

• exponents

• coefficients

• subscripts

Multiple Choice

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

Multiple Choice

True or False. In the equation above there are a total of 2 hydrogen and 2 oxygen

• True

• False

Multiple Choice

How many Nitrogen atoms are in the in H₂C₃O₄N₅?

• 2

• 3

• 4

• 5

Multiple Choice

The large numbers before a chemical formula that are used as multipliers are known as __________________.

• element symbols

• exponents

• coefficients

• subscripts

Multiple Choice

What is the coefficient in the formula?

• 2

• N

• H

• 3

Fill in the Blank

How many molecules are in 3 NaCl

Fill in the Blank

How many total atoms of Be are in 2 BeF₂?

Fill in the Blank

How many total atoms of K are in 2 K₂O?

Fill in the Blank

How many total atoms of O are in 2 K₂O?

Multiple Choice

How many Hydrogen atoms are in 4H₂O?

• 8

• 12

• 4

Multiple Choice

How many atoms are there of each element?

H₂SO₄

• H = 2, S = 4, O = 4

• H = 2, S = 1, O = 4

• H = 8, S = 4, O = 4

• H = 2, SO = 4

Multiple Choice

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

• 0

• 1

• 2

Multiple Choice

Calculate the number of Oxygen atoms in Al(OH)₃

• 1

• 2

• 3

• 4

Fill in the Blank

How many O's are in Al₂(SO₄)₃