Balancing Chemical Equations

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 are coefficients in a chemical equation?

Back

Coefficients are the numbers placed in front of the compounds in a chemical equation to indicate the number of molecules or moles of each substance involved in the reaction.

Front

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

Back

To determine coefficients, adjust the numbers in front of the compounds 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 is neither created nor destroyed in a chemical reaction; therefore, the total mass of reactants must equal the total mass of products.

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 does it mean if a chemical equation is unbalanced?

Back

An unbalanced chemical equation does not have the same number of atoms of each element on both sides, indicating that the reaction does not obey the law of conservation of mass.

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 a common method for balancing chemical equations?

Back

A common method is the trial-and-error approach, where coefficients are adjusted systematically until the equation is balanced.

Front

What is the balanced equation for the reaction of calcium and water?

Back

Ca + 2H2O -> Ca(OH)2 + H2.

Front

What is the balanced equation for the combustion of carbon monoxide with iron(III) oxide?

Back

3CO + Fe2O3 -> 2Fe + 3CO2.