Counting Atoms in Chemical Compounds

The video tutorial explains how to count atoms in chemical formulas, starting with simple molecules like water (H2O) and progressing to more complex structures. It covers the significance of numbers and parentheses in formulas, demonstrating how to distribute numbers across elements within parentheses. The tutorial also clarifies the distinction between uppercase and lowercase letters in chemical symbols, ensuring accurate identification of elements. Through examples, the video illustrates the process of counting atoms in various compounds, including sodium sulfate and tin chloride, providing a comprehensive understanding of chemical notation.

What is the total number of hydrogen atoms in a water molecule (H2O)?

• 4

• 3

• 2

• 1

In the formula Mg(ClO3)2, how many chlorine atoms are present?

• 1

• 2

• 3

• 4

How many oxygen atoms are there in the compound Mg(ClO3)2?

• 6

• 5

• 4

• 3

In the compound Na2SO4, how many sodium atoms are present?

• 4

• 3

• 2

• 1

How many sulfur atoms are in Na2SO4?

• 1

• 0

• 3

• 2

What is the total number of atoms in the compound Na2SO4?

• 7

• 6

• 5

• 8

In the compound Fe(H2O)6, how many hydrogen atoms are there?

• 12

• 6

• 18

• 24

How many oxygen atoms are in Fe(H2O)6?

• 6

• 24

• 12

• 18

In the compound Sn(CN)4, how many carbon atoms are present?

• 1

• 2

• 4

• 3

How many nitrogen atoms are in Sn(CN)4?

• 3

• 1

• 2

• 4