Counting Atoms

Front

What is the definition of an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element, consisting of a nucleus surrounded by electrons.

Front

What is the chemical symbol for Calcium?

Back

The chemical symbol for Calcium is Ca.

Front

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

Back

To determine the number of atoms of an element in a chemical formula, look for the subscript next to the element's symbol. If there is no subscript, it means there is one atom of that element.

Front

What is the chemical symbol for Iron?

Back

The chemical symbol for Iron is Fe.

Front

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

Back

To calculate the total number of atoms, add up all the atoms of each element present in the formula, taking into account any coefficients and subscripts.

Front

What does a subscript in a chemical formula indicate?

Back

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

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance in a chemical reaction, affecting the total number of atoms.

Front

How many atoms are in the molecule H2O?

Back

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

Front

What is the total number of atoms in the molecule C2H5Au5?

Back

There are 12 atoms in the molecule C2H5Au5 (2 Carbon, 5 Hydrogen, and 5 Gold atoms).

Front

How many atoms of Chlorine are in the molecule 5Cl2?

Back

There are 10 atoms of Chlorine in the molecule 5Cl2 (5 molecules of Cl2, each containing 2 Chlorine atoms).