Balancing Equations ch 8 flashcard

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, following the law of conservation of mass.

Front

What does the coefficient in a chemical equation represent?

Back

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

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure the same number of each type of atom on both sides.

Front

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

Back

CH4 + 2O2 -> CO2 + 2H2O.

Front

What is the balanced equation for the reaction of zinc with hydrochloric acid?

Back

Zn + 2HCl -> ZnCl2 + H2.

Front

What is the balanced equation for the reaction of tin(IV) oxide with hydrogen?

Back

SnO2 + 2H2 -> Sn + 2H2O.

Front

What is the significance of the law of conservation of mass in balancing equations?

Back

The law of conservation of mass states that matter cannot be created or destroyed, so the mass of reactants must equal the mass of products.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What does it mean if an equation is unbalanced?

Back

An unbalanced equation does not have the same number of each type of atom on both sides, violating the law of conservation of mass.