Chemical Formulas

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements and numbers to indicate the quantity of each element.

Tags

NGSS.MS-PS1-1

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule. For example, in H₂O, the '2' indicates there are two hydrogen atoms.

Tags

NGSS.MS-PS1-1

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different types of atoms bond together.

Front

What does the coefficient in a chemical formula represent?

Back

The coefficient represents the number of molecules of the compound. For example, in 2H₂O, the '2' indicates there are two molecules of water.

Front

How do you determine the total number of atoms in a chemical formula?

Back

To find the total number of atoms, add the number of atoms of each element present in the formula. For example, in H₂O, there are 2 hydrogen atoms and 1 oxygen atom, totaling 3 atoms.

Tags

NGSS.MS-PS1-1

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O.

Front

How many oxygen atoms are in the chemical formula C₆H₁₂O₆?

Back

There is 1 oxygen atom in the chemical formula C₆H₁₂O₆.

Tags

NGSS.MS-PS1-1

Front

What is the chemical formula for carbon dioxide?

Back

The chemical formula for carbon dioxide is CO₂.

Tags

NGSS.MS-PS1-1

Front

How many total atoms are in the formula NaCl?

Back

There are 2 total atoms in the formula NaCl (1 sodium atom and 1 chlorine atom).

Tags

NGSS.MS-PS1-1

Front

What does the formula CH₄ represent?

Back

The formula CH₄ represents methane, which consists of 1 carbon atom and 4 hydrogen atoms.

Tags

NGSS.MS-PS1-1