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 compound?

Back

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

Front

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

Back

Count the number of each type of atom indicated by the subscripts in the formula.

Front

What does the subscript in a chemical formula represent?

Back

The subscript indicates the number of atoms of the element that are present in the molecule.

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the enclosed atoms are grouped together and can be multiplied by a coefficient outside the parentheses.

Front

How many total atoms are in the compound H₂O?

Back

There are 3 total atoms in H₂O (2 Hydrogen and 1 Oxygen).

Front

What is the total number of atoms in the compound C₆H₁₂O₆?

Back

There are 24 total atoms in C₆H₁₂O₆ (6 Carbon, 12 Hydrogen, and 6 Oxygen).

Front

How many atoms of Nitrogen are in (NH₄)₂SO₄?

Back

There are 2 Nitrogen atoms in (NH₄)₂SO₄.

Front

What is the total number of Oxygen atoms in 2H₂O?

Back

There are 4 Oxygen atoms in 2H₂O.

Front

How many atoms are in the compound Fe(NO₃)₃?

Back

There are 12 total atoms in Fe(NO₃)₃ (1 Iron, 3 Nitrogen, and 9 Oxygen).