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

What does the subscript in a chemical formula indicate?

Back

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

Front

How many atoms are in one molecule of water (H2O)?

Back

There are 3 atoms in one molecule of water: 2 hydrogen (H) and 1 oxygen (O).

Front

What is the chemical formula for sodium chloride?

Back

The chemical formula for sodium chloride is NaCl.

Front

How many sodium (Na) atoms are in 6NaCl?

Back

There are 6 sodium (Na) atoms in 6NaCl.

Front

How many total atoms are in H2SO4?

Back

There are 7 total atoms in H2SO4: 2 hydrogen (H), 1 sulfur (S), and 4 oxygen (O).

Front

What is the total number of atoms in the compound C2H8O?

Back

There are 11 total atoms in C2H8O: 2 carbon (C), 8 hydrogen (H), and 1 oxygen (O).

Front

How many elements are in the compound C2H8O?

Back

There are 3 elements in C2H8O: carbon (C), hydrogen (H), and oxygen (O).

Front

What is the chemical formula for magnesium chloride?

Back

The chemical formula for magnesium chloride is MgCl2.