Balancing Reactions

Front

What is the number before a chemical formula called?

Back

Coefficient

Front

How many Hydrogen atoms are in 4H₂O?

Back

8

Front

When the equation NH₃ + O₂ → HNO₃ + H₂O is completely balanced using smallest whole numbers, what is the coefficient of O₂?

Back

2

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be gained or lost in a chemical reaction.

Front

How do you balance the equation Fe + O₂ → Fe₂O₃?

Back

4Fe + 3O₂ → 2Fe₂O₃

Front

What is a subscript in a chemical formula?

Back

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

Front

What is the purpose of balancing chemical equations?

Back

To ensure that the same number of each type of atom is present on both sides of the equation.

Front

What is the difference between a coefficient and a subscript?

Back

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

Front

What is the balanced equation for the combustion of methane (CH₄)?

Back

CH₄ + 2O₂ → CO₂ + 2H₂O

Front

What is the total number of oxygen atoms in the balanced equation 2H₂ + O₂ → 2H₂O?

Back

2