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 chemical formula?

Back

A chemical formula is a way of expressing the number and type of atoms in a substance using symbols and numbers.

Front

What does a subscript in a chemical formula indicate?

Back

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

Front

What does a coefficient in a chemical equation represent?

Back

A coefficient indicates the number of molecules or moles of a substance in a chemical reaction.

Front

How many atoms are in the molecule H2O?

Back

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

Front

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

Back

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

Front

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

Back

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

Front

How many atoms of Iron (Fe) are in the formula Fe2O3?

Back

There are 2 atoms of Iron in Fe2O3.

Front

What is the significance of parentheses in a chemical formula?

Back

Parentheses indicate that the atoms inside them are grouped together and can be multiplied by a subscript outside the parentheses.

Front

How many atoms of Calcium (Ca) are in the formula CaCl2?

Back

There is 1 atom of Calcium in CaCl2.