Balancing Chemical Equations

Front

What is a Balanced Chemical Equation (BCE)?

Back

A Balanced Chemical Equation is an equation that shows the reactants and products of a chemical reaction with equal numbers of each type of atom on both sides.

Front

What is the right ratio of chemicals for the BCE: FeCl3 + Ca(OH)2 --> Fe(OH)3 + CaCl2?

Back

2,3 --> 2,3

Front

What is the coefficient in a chemical equation?

Back

The large number in front of a chemical formula that indicates how many molecules or moles of that substance are involved in the reaction.

Front

Complete the equation: 4Ag + O2 --> ___Ag2O

Back

2

Front

What does it mean for a chemical equation to be unbalanced?

Back

An unbalanced equation has unequal numbers of atoms of each element on the reactant and product sides.

Front

Identify the unbalanced equation: CaCO3 --> CaO + CO2, PbO2 + 2H2 --> 2Pb + H2O, 2Na + 2H2O --> 2NaOH + H2, CS2 + 2O2 --> CO2 + 2SO2.

Back

PbO2 + 2H2 --> 2Pb + H2O

Front

What is the purpose of balancing chemical equations?

Back

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

Front

What is the product of the reaction: 2NH3 + 3CuO --> N2 + ___Cu + 3H2O?

Back

3

Front

What is the significance of the small number in a chemical formula?

Back

It indicates the number of atoms of that element in one molecule of the compound.

Front

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

Back

By adjusting the coefficients in front of the chemical formulas to ensure the same number of each type of atom on both sides.