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.

Front

What does a subscript in a chemical formula indicate?

Back

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

Front

How many atoms are in the compound H2O?

Back

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

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

How many elements are in the compound NaCl?

Back

There are 2 elements in NaCl (Sodium and Chlorine).

Front

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

Back

Total number of atoms = sum of the products of the subscripts and the coefficients.

Front

What is a coefficient in a chemical formula?

Back

A coefficient is a number placed in front of a compound in a chemical equation that indicates how many molecules of that compound are present.

Front

How many atoms of Chlorine are in the formula 2B(ClO3)3?

Back

There are 6 atoms of Chlorine in the formula 2B(ClO3)3.

Front

What is the significance of the periodic table in chemistry?

Back

The periodic table organizes all known elements based on their atomic number and properties.

Front

How many Sodium atoms are in 6NaCl?

Back

There are 6 Sodium atoms in 6NaCl.