Counting Atoms

Front

What is the chemical formula for water?

Back

H₂O

Front

How many atoms are in one molecule of H₂O?

Back

3 (2 Hydrogen atoms and 1 Oxygen atom)

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.

Front

How many total atoms are in 4H₂O?

Back

12 (8 Hydrogen atoms and 4 Oxygen atoms)

Front

If a chemical symbol has no subscript, how many atoms does it represent?

Back

1 atom.

Front

How many Chlorine atoms are in 10MgCl₂?

Back

20 (10 Magnesium atoms and 20 Chlorine atoms)

Front

What is the total number of atoms in Al₂O₃?

Back

5 (2 Aluminum atoms and 3 Oxygen atoms)

Front

How do you calculate the total number of atoms in a compound?

Back

Add the number of atoms of each element, considering their subscripts.

Front

What is the significance of the coefficient in a chemical formula?

Back

It indicates the number of molecules or formula units.

Front

How many Oxygen atoms are in 2H₂O?

Back

2 Oxygen atoms.