Reading Chemical Formulas

Open Ended

What are some chemical formulas that you already know?

Multiple Choice

Why is it important to use capital letters when writing chemical element symbols in formulas?

• Because capital letters indicate the start of a new element symbol.

• Because capital letters make the formula look neater.

• Because lowercase letters are not allowed in chemistry.

• Because capital letters represent the number of atoms.

Multiple Choice

What does the coefficient in a chemical formula represent?

• The number of atoms in a molecule

• The number of molecules

• The type of elements present

• The charge of the molecule

Open Ended

Why is the subscript '1' not written in chemical formulas, such as for oxygen in H2O?

Multiple Choice

How does a subscript in a chemical formula differ from a coefficient?

• A subscript tells you the number of molecules, while a coefficient tells you the number of atoms.

• A subscript tells you the number of atoms for the element before it, while a coefficient tells you the number of molecules.

• A subscript tells you the charge, while a coefficient tells you the type of element.

• A subscript tells you the number of elements, while a coefficient tells you the number of compounds.

Fill in the Blanks

What is the total number of molecules shown in the diagram?

Multiple Choice

How do parentheses affect the calculation of the total number of atoms in a chemical formula?

• They are ignored in the calculation.

• They indicate that the atoms inside should be added together.

• They indicate that the atoms inside should be multiplied by the subscript outside the parentheses.

• They change the type of atoms present.

Multiple Choice

Given the formula 3Ca(OH)2, how many oxygen atoms are present in total?

• 2

• 3

• 6

• 9

Fill in the Blanks

In the compound 3LiOH, the number of hydrogen atoms is

.

Open Ended

Explain the steps you would take to determine the total number of oxygen atoms in the compound 4Fe2(CO3)3.

Multiple Choice

Which of the following chemical formulas contains the highest total number of atoms for a single element?

• 5SrCl2 (Cl=10)

• Al2(SO4)3 (O=12)

• 3Ni3(PO4)2 (O=24)

• 4Fe2(CO3)3 (O=36)

Open Ended

After learning about chemical formulas and element symbols, what is one question you still have or something you would like to know more about?

Multiple Choice

What is the significance of a capital letter in a chemical formula?

• It represents a new element.

• It indicates the number of atoms.

• It shows the state of matter.

• It is used for decoration.