Compounds and Molecules

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is a molecule?

Back

A molecule is the smallest unit of a chemical compound that retains its chemical properties, consisting of two or more atoms bonded together.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element present in one molecule of the compound.

Front

In the formula H₂O, what do the numbers represent?

Back

The numbers represent the number of hydrogen (2) and oxygen (1) atoms in one molecule of water.

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 made of two or more different types of atoms chemically bonded together.

Front

What is the chemical formula for ammonia?

Back

The chemical formula for ammonia is NH₃.

Front

How many total atoms are in one molecule of CO₂?

Back

There are 3 total atoms in one molecule of CO₂ (1 carbon atom and 2 oxygen atoms).

Front

What does the number 2 in the formula O₂ signify?

Back

The number 2 signifies that there are 2 oxygen atoms in the molecule.

Front

What is the significance of the chemical formula?

Back

The chemical formula provides information about the types and numbers of atoms in a compound.

Front

What is a chemical bond?

Back

A chemical bond is the force that holds atoms together in a compound.