Molecular, Ionic, and Net Ionic Equations

What are the coefficients for the balanced chemical equation for the combustion of methane (CH4) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O)?

• 1, 1, 1, 1

• 1, 2, 1, 2

• 2, 1, 2, 1

• 1, 2, 2, 1

For which type of chemical reaction are ionic equations most important?

• Combustion reactions

• Redox reactions

• Aqueous reactions

• Decomposition reactions

What is the primary purpose of a net ionic equation?

• To show all reactants and products in their molecular form.

• To balance the number of atoms on both sides of the equation.

• To focus only on the atoms that are directly involved in the chemical change.

• To represent reactions occurring in the gas phase.

What is the correct sequence of steps when writing a chemical equation from an observed chemical change?

• Balance the equation, write reactants and products, observe, describe.

• Observe, describe, write reactants and products, balance the equation.

• Describe, balance the equation, observe, write reactants and products.

• Write reactants and products, observe, balance the equation, describe.

When a solution of lead nitrate is added to a solution of potassium iodide, what yellow precipitate is produced?

• Lead nitrate

• Potassium nitrate

• Lead iodide

• Potassium iodide

Which type of chemical equation explicitly shows all dissolved ions, including those that do not participate in the reaction?

• Molecular equation

• Net ionic equation

• Complete ionic equation

• Balanced equation

In the reaction between lead nitrate and potassium iodide, which ions are considered spectator ions?

• Pb2+ and I-

• K+ and NO3-

• Pb2+ and NO3-

• K+ and I-

What is the net ionic equation for the reaction between lead nitrate and potassium iodide?

• Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)

• Pb2+(aq) + 2I-(aq) → PbI2(s)

• Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + 2I-(aq) → PbI2(s) + 2K+(aq) + 2NO3-(aq)

• 2K+(aq) + 2NO3-(aq) → 2KNO3(aq)