Counting Subscripts

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

How many aluminum atoms are in Al₂O₃?

Back

2

Front

How many different elements are in the molecule 3 NH₄C₂H₃O₂?

Back

4

Front

What elements are represented in the formula Fe₂O₃?

Back

Iron, Oxygen

Front

What is the total number of atoms in H₂O₂?

Back

4

Front

What does the formula H₂O represent?

Back

Water, consisting of 2 hydrogen atoms and 1 oxygen atom.

Front

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

Back

Add the subscripts of all elements in the formula.

Front

What is the significance of the number in front of a chemical formula (like 3 in 3 NH₄C₂H₃O₂)?

Back

It indicates the number of molecules present.

Front

How many different elements are in H₂COCH₂?

Back

3

Front

What is the formula for calculating the number of atoms in a compound?

Back

Count the subscripts for each element and sum them up.