Subscripts and Coefficients Practice 2024

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

What is a coefficient in a chemical formula?

Back

A coefficient is a number written in front of a chemical formula that indicates how many molecules or moles of that substance are present.

Front

In the formula 4H₂O, what does the '4' represent?

Back

The '4' is a coefficient indicating that there are 4 molecules of water.

Front

In the formula C₆H₁₂O₆, how many hydrogen atoms are there?

Back

There are 12 hydrogen atoms.

Front

How many different elements are in the compound NaCl?

Back

There are 2 different elements: sodium (Na) and chlorine (Cl).

Front

What does the subscript '2' in H₂O indicate?

Back

It indicates that there are 2 hydrogen atoms in each molecule of water.

Front

How many oxygen atoms are in the formula 3Ca(NO₃)₂?

Back

There are 6 oxygen atoms.

Front

What is the total number of atoms in the molecule 2C₃H₈?

Back

There are 22 atoms in total (2 x (3+8) = 22).

Front

In the formula Fe₂O₃, how many iron atoms are present?

Back

There are 2 iron atoms.

Front

What is the difference between a subscript and a coefficient?

Back

A subscript indicates the number of atoms of an element in a molecule, while a coefficient indicates the number of molecules.