Chemical Formulas Practice

Front

What is the chemical formula for caffeine?

Back

C8H10N4O2

Front

How many oxygen atoms are in a molecule of caffeine (C8H10N4O2)?

Back

2

Front

How many oxygen atoms (O) are in a molecule of water (H2O)?

Back

1

Front

What do the blue numbers in a chemical formula represent?

Back

Subscripts

Front

What is the chemical formula for methane?

Back

CH4

Front

How many carbon atoms (C) are in a CO2 molecule?

Back

1

Front

What is a molecule?

Back

A molecule is a group of atoms bonded together.

Front

What is a compound?

Back

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

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.

Front

What does the subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.