Mastering Chemical Formulas and Atomic Counts

The video tutorial explains how to interpret chemical formulas with subscripts and parentheses. It covers the multiplication of subscripts outside parentheses with elements inside, using examples like Fe(OH)3, PO4, and C3H5(OH)3. The tutorial emphasizes the importance of counting atoms and provides step-by-step practice examples to reinforce learning.

What happens to the elements inside parentheses when there is a subscript outside?

• The elements inside are divided by the subscript.

• The elements inside are added to the subscript.

• The elements inside are multiplied by the subscript.

• The elements inside remain unchanged.

In the formula Fe(OH)3(PO4)2C3H5(OH)3, what is the first step in solving it?

• Multiply all elements by 2.

• Ignore the subscripts.

• Box the elements and write them down.

• Add all the subscripts together.

How many oxygen atoms are there in Fe(OH)3?

• 2

• 1

• 4

• 3

In the formula Fe(OH)3, how many total atoms are present?

• 7

• 6

• 8

• 5

In the formula with nested parentheses, what is the first step?

• Ignore the parentheses.

• Add the subscripts together.

• Box the elements and write them down.

• Multiply the outer subscript by the inner subscript.

How many phosphorus atoms are there in the formula with nested parentheses?

• 2

• 4

• 1

• 3

In the formula C3H5(OH)3, how many carbon atoms are present?

• 4

• 3

• 5

• 2

How many hydrogen atoms are there in C3H5(OH)3?

• 10

• 8

• 6

• 5

In C3H5(OH)3, how many oxygen atoms are present?

• 1

• 2

• 3

• 4

What is the total number of atoms in C3H5(OH)3?

• 12

• 13

• 14

• 15