Balancing Chemical Equations

Front

What is a balanced chemical equation?

Back

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

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

Front

What is a subscript in a chemical formula?

Back

A subscript is a small number written to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

How do you determine if a chemical equation is balanced?

Back

Count the number of atoms of each element on both sides of the equation. If they are equal, the equation is balanced.

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 purpose of balancing chemical equations?

Back

Balancing chemical equations ensures that the same amount of each element is present before and after the reaction, reflecting the conservation of mass.

Front

What does the equation 2H₂ + O₂ → 2H₂O represent?

Back

This equation represents the balanced reaction of hydrogen and oxygen to form water, with coefficients indicating the ratio of molecules.

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 an example of a balanced chemical equation?

Back

2H₂ + O₂ → 2H₂O is an example of a balanced equation, showing 4 hydrogen and 2 oxygen atoms on both sides.

Front

What does it mean if a chemical equation is unbalanced?

Back

An unbalanced chemical equation has different numbers of atoms for one or more elements on each side, violating the law of conservation of mass.