Understanding Chemical Formulas

What is the main purpose of a subscript in a chemical formula?

• To denote the chemical name of a substance

• To represent the type of chemical bond

• To show the number of atoms of an element

• To indicate the number of molecules

How does a coefficient in a chemical formula help us?

• It represents the chemical name of a substance

• It shows the number of atoms of an element

• It indicates the type of chemical bond

• It tells the number of molecules of the substance

What does a blank subscript in a chemical formula imply?

• The element has one atom

• The element is a gas

• The element is not present

• The element has two atoms

In the chemical formula for water, H2O, how many hydrogen atoms are there?

• Four

• Three

• Two

• One

For the chemical formula C6H12O6, what is the total number of atoms?

• 30

• 36

• 18

• 24

How do you calculate the total number of atoms in a formula with a coefficient?

• Add the subscripts of all elements

• Multiply the coefficient by the sum of all subscripts

• Multiply each subscript by the coefficient and sum them

• Divide the coefficient by the number of elements

What should you do when you see parentheses in a chemical formula?

• Divide the subscript outside by each inside

• Add the numbers inside the parentheses

• Multiply the subscript outside by each inside

• Ignore the parentheses

In a formula with repeated elements, how should you count them?

• Count each occurrence separately

• Ignore repeated elements

• Count them as one element

• Add them together as the same element

If a chemical formula has a coefficient of 3 and a subscript of 2 for an element, how many atoms of that element are there?

• 5

• 6

• 2

• 3

What is the total number of atoms in a formula with the elements Na, P, and O, given the subscripts 1, 2, and 4 respectively, and no coefficient?

• 7

• 9

• 13

• 11