Balancing Equations Practice

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, indicating that mass is conserved during a chemical reaction.

Front

What does a coefficient in a chemical equation represent?

Back

A coefficient indicates the number of molecules or moles of a substance involved in a chemical reaction.

Front

How do you determine the coefficients needed to balance a chemical equation?

Back

You adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction; it can only change forms.

Front

What is the coefficient of O2 in the balanced equation C2H6 + O2 → H2O + CO2?

Back

The coefficient of O2 is 5.

Front

What is the coefficient of H2SO4 in the balanced equation Fe + H2SO4 → Fe2(SO4)3 + H2?

Back

The coefficient of H2SO4 is 3.

Front

How do you balance the equation NH3 + O2 → NO + H2O?

Back

The balanced equation is 4 NH3 + 5 O2 → 4 NO + 6 H2O.

Front

What is the first step in balancing a chemical equation?

Back

The first step is to write the unbalanced equation and count the number of atoms of each element on both sides.

Front

What is the significance of the subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule; they cannot be changed when balancing equations.

Front

What is the balanced form of the equation C2H6 + O2 → H2O + CO2?

Back

The balanced form is 2 C2H6 + 5 O2 → 6 H2O + 4 CO2.