Counting atoms

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

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

Back

Count the subscripts in the formula; if no subscript is present, it is assumed to be 1.

Front

What does the subscript in a chemical formula represent?

Back

The subscript indicates the number of atoms of the element in the molecule.

Front

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

Back

There are 2 hydrogen atoms.

Front

In the formula (NH₄)₂CrO₄, how many nitrogen atoms are there?

Back

There are 2 nitrogen atoms.

Front

What is the total number of atoms in H₂C₃O₄N₅?

Back

There are 14 total atoms.

Front

How many oxygen atoms are in H₂O?

Back

There is 1 oxygen atom.

Front

In the formula 4H₂O, how many total hydrogen atoms are there?

Back

There are 8 hydrogen atoms.

Front

What is the total number of atoms in H₂O₂?

Back

There are 4 total atoms.