Counting atoms

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

How do you count atoms in a chemical formula?

Back

To count atoms in a chemical formula, identify the elements and their respective subscripts. The subscript indicates the number of atoms of that element.

Front

What does the subscript in a chemical formula represent?

Back

The subscript indicates the number of atoms of the element that precedes it in the chemical formula.

Front

In the formula H₂O, how many hydrogen atoms are there?

Back

There are 2 hydrogen atoms in the formula H₂O.

Front

In the formula NaClO₄, how many chlorine atoms are there?

Back

There is 1 chlorine atom in the formula NaClO₄.

Front

What is the total number of atoms in the molecule ClN₆Fe₂?

Back

The total number of atoms is 9 (1 Cl + 6 N + 2 Fe = 9).

Front

How many oxygen atoms are in H₂O₂?

Back

There are 2 oxygen atoms in the formula H₂O₂.

Front

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

Back

The total number of atoms is 24 (6 C + 12 H + 6 O = 24).

Front

How many magnesium atoms are in 10MgCl₂?

Back

There are 10 magnesium atoms in 10MgCl₂.