8.5 D: Counting Atoms with Coefficients

8.5 D: Counting Atoms with Coefficients

Recognize that chemical formulas 

are used to identify substances and 

Determine the number of atoms of 

each element in chemical formulas 

containing subscripts. 

Multiple Choice

CFU:

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

• element symbol; atoms

• subscript; protons

• atom; element symbol

• compound; elements

Multiple Choice

If there is no subscript, there is ______ atom(s) of that element.

• 0

• 2

• 1

• 1 million

Multiple Choice

How many Hydrogen atoms are in 4H₂O?

• 6

• 2

• 4

• 8

Multiple Choice

How many Magnesium atoms are in 10MgCl₂?

• 10

• 20

• 5

• 2

Multiple Choice

How many Sodium atoms are in 6NaCl?

• 1

• 6

• 2

• Na

Multiple Choice

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

• 4

• 8

• 2

• 24

Multiple Select

How many atoms of Oxygen are in Fe(NO₃)₃ ?

• 6

• 9

• 3

• 1

Multiple Choice

What is a coefficient?

• the small number on the right of the chemical symbol

• the numbers inside of the parentheses

• the large number to the left of a formula

• the small number to the left of the chemical symbol

Multiple Select

The coefficient in 3H₂O is:

• 3

• 8

• 1

• 2

Multiple Choice

How many atoms are in 3H₂O₂ ?

• 4

• 18

• 12

• 24

Multiple Select

How many MOLECULES are in 5C₉H₈O₈ ?

• 5

• 25

• 125

• 16

Multiple Choice

How many atoms of O are in 4Mg(OH)2

​

?

• 4

• 2

• 8

• 1