Coefficient and Subscripts Quiz

5NaC₃HO₂

_{How many Hydrogen atoms are in the formula above?}

• 10

• 5

• 30

• 1

5NaC₃HO₂

_{How many elements are in the formula above?}

• 10

• 5

• 30

• 1

What do subscripts represent in a chemical formula?

• The temperature at which a molecule is formed.

• The mass of each element in a molecule.

• The charge of each element in a molecule.

• The number of atoms of each element in a molecule.

In the chemical formula H₂O, what does the subscript '2' represent?

• number of oxygen atoms

• number of water molecules

• number of carbon atoms

• number of hydrogen atoms

What is the coefficient of O2 in the balanced equation: 2H₂ + O₂ → 2H₂O?

• 1

• 4

• 3

• 2

What is the coefficient of CO2 in the balanced equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O?

• 6

• 1

• 2

• 3

How many elements are on the left hand side (reactant side) of the arrow? C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O?

• 6

• 4

• 36

• 3

What is the coefficient of NH₃ in the balanced equation: N₂ + 3H₂ → 2NH₃?

• 1

• 3

• 4

• 2

What is the coefficient of H2O in the balanced equation: 2H2 + O2 → 2H2O?

• 1

• 2

• 3

• 4

How many total atoms are in the chemical formula MgCl₂?

• undetermined

• 1

• 2

• 3