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 an unbalanced chemical equation?

Back

An unbalanced chemical equation does not have the same number of each type of atom on both sides, meaning that mass is not conserved.

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 a coefficient in a chemical equation?

Back

A coefficient is a large 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 does the arrow in a chemical equation represent?

Back

The arrow represents the direction of the chemical reaction, indicating the reactants are transformed into products.

Front

What is the purpose of balancing chemical equations?

Back

Balancing chemical equations ensures that the law of conservation of mass is followed, meaning that matter is neither created nor destroyed in a chemical reaction.

Front

What is the subscript in a chemical formula?

Back

A subscript is a small number written after an element symbol that indicates the number of atoms of that element in a molecule.

Front

Balance the equation: H2 + O2 → H2O. What coefficients are needed?

Back

2 H2 + 1 O2 → 2 H2O.

Front

What is the first step in balancing a chemical equation?

Back

Identify the number of atoms of each element in the reactants and products.

Front

What does it mean if a chemical equation is not balanced?

Back

It means that the number of atoms of at least one element is different on the reactant side compared to the product side.