Counting Atoms

How to read Chemical Formulas
You need to take notes in your journal as you watch the video. (Answers to slides 3-7)

Fill in the Blank

How do you know when there is a new element symbol in a chemical formula?

.

Fill in the Blank

What does the coefficient tell us?

Multiple Choice

What does the subscript in the chemical formula tell us?

• How many molecules there are.

• How many compounds there are.

• How many atoms of each element there are.

• How many elements there are.

Multiple Choice

What does it mean when there is not a subscript after an element symbol?

• There is one atom of that element.

• There are too many elements to count.

• Someone is being lazy.

Multiple Choice

What do the paranthesis show?

• elements that like to be together

• elements that form a compound within the new compound.

• Just for fun>

Multiple Choice

How many Oxygen atoms are there?

• 2

• 4

• 6

• 12

Multiple Choice

How many Sulfer atoms are there?

• 1

• 2

• 3

• 4

Multiple Choice

How many SO4 are there?

• 1

• 2

• 3

• 4

Multiple Choice

How many Barium atoms are there?

• 3

• 5

• 1

• 7

Multiple Choice

How many total atoms are there?

• 3

• 10

• 6

• 13

Multiple Choice

How many elements are in this chemical formula?

• 1

• 2

• 3

• 4