Counting Atoms with Subscripts

Counting Atoms with Subscripts

8.5D Recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts

Chemical Formulas are:

•Lists of elements that make up a compound

•They use Symbols for the elements present

Chemical Formulas:

• Use Subscripts (small numbers) to indicate the number of atoms of an element present in the compound

•No subscript=1 atom of that element

•Subscripts only refer to the atom they are behind.

Multiple Choice

The subscript is a:

• capital letter in the chemical formula.

• chemical formula.

• small number behind the element.

• none of these.

Multiple Choice

The subscript tells you :

• the number of elements present in a particular compound

• the number of compounds in a particular atom

• the number of atoms of a particular element in a compound

• none of these

Multiple Choice

The subscript refers to the element it is __________.

• on top of

• in front of

• behind

• underneath

Multiple Select

What are two ways you can represent an element?

• As an uppercase letter

• As a compound

• As a small number

• As an uppercase letter an a lowercase letter

Multiple Select

Choose all of the elements you would underline in the following chemical formula. NaCl

• Na

• C

• N

• Cl

Multiple Select

Choose all of the elements you would underline in the following chemical formula. Ag₂S

• A

• Ag

• 2

• S

Multiple Choice

What subscript indicates the number of Hydrogen (H) atoms? C₁₂H₂₂O₁₁

• 12

• 22

• 11

• 1

Multiple Choice

What subscript indicates the number of Oxygen (O) atoms? C₃H₆O

• 3

• 6

• 0

• 1

Multiple Choice

What subscript indicates the number of atoms for Carbon (C)? NaHCO₃

• 1

• 3

• Na

• C

Multiple Choice

How many elements are present in this compound? NaCl

• 1

• 2

• 3

• 4

Multiple Choice

What subscript represents the number of Chlorine (Cl) atoms in the chemical formula : SbCl₃ ?

• 1

• 2

• 3

• 4

Multiple Choice

What is the total number of atoms in the chemical formula SO₃ ?

• 1

• 4

• 3

• 2

Multiple Choice

How many atoms of Sodium (Na) are present in this compound?

NaCl

• 1

• 2

• 3

• 11

Multiple Choice

How many total atoms are present in this compound?

C₁₂H₂₂O₁₁

• 12

• 22

• 45

• 11

Multiple Choice

How many total atoms are present in the chemical formula Na₂CO₃ ?

• 2

• 4

• 6

• 5