Subscripts and Coefficients Practice 2022

Front

What are subscripts in a chemical formula?

Back

Subscripts are numbers written below and to the right of an element symbol in a chemical formula that indicate the number of atoms of that element in a molecule.

Front

What are coefficients in a chemical equation?

Back

Coefficients are numbers placed in front of a chemical formula that indicate how many molecules or moles of that substance are involved in a reaction.

Front

How many different elements are present in the molecule 3 NH₄C₂H₃O₂?

Back

4 (Nitrogen, Hydrogen, Carbon, Oxygen)

Front

How many Hydrogen atoms are in 4H₂O?

Back

8 (4 molecules of H₂O contain 4 x 2 = 8 Hydrogen atoms.)

Front

What is the total number of atoms in the compound CaCO₃?

Back

5 (1 Calcium, 1 Carbon, 3 Oxygen = 5 total atoms)

Front

In the compound H₂SO₄, how many Sulfur atoms are present?

Back

1 (There is 1 Sulfur atom in H₂SO₄.)

Front

In the compound 4CF₂Cl₂, how many Chlorine atoms are present?

Back

8 (4 molecules of CF₂Cl₂ contain 4 x 2 = 8 Chlorine atoms.)

Front

What does the formula H₂O represent?

Back

Water, consisting of 2 Hydrogen atoms and 1 Oxygen atom.

Front

How do you determine the number of atoms in a molecule with coefficients and subscripts?

Back

Multiply the coefficient by the subscript for each element and sum the total.

Front

What is the significance of the subscript '2' in H₂?

Back

It indicates that there are 2 Hydrogen atoms in the molecule.