Balancing 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 a chemical reaction.

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

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms for each element is equal on both sides.

Front

What is a coefficient in a chemical equation?

Back

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

Front

What does it mean if a chemical equation is unbalanced?

Back

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

Front

What is the purpose of balancing chemical equations?

Back

Balancing chemical equations ensures that the reaction accurately represents the conservation of mass and allows for the correct stoichiometric calculations.

Front

What is the total number of atoms in H2SO4?

Back

There are 7 atoms in H2SO4 (2 hydrogen, 1 sulfur, and 4 oxygen).

Front

How many moles of HCl are produced from the reaction of PCl5 with water?

Back

4 moles of HCl are produced from the reaction of PCl5 with water.

Front

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

Back

The balanced equation is CH4 + 2O2 → CO2 + 2H2O.

Front

Which of the following is a balanced equation: 2Na + 2H2O → 2NaOH + H2?

Back

Yes, 2Na + 2H2O → 2NaOH + H2 is a balanced equation.