Chemical Reactions Practice (FY23)

The reaction represented by the equation Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq) is a

• decomposition reaction.

• double-displacement reaction.

• synthesis reaction.

• single-displacement reaction.

  Show answersExplanationPreviousNext

• combustion reaction.

Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?

• P(s) + O₂(g) → P₂O₅(s)

• P₂O₅(s) → P₂(s) + O₂(g)

• P(s) + O₂(g) → P₅O₂(g)

• P(s) + O₂(g) → PO₂(g)

Which of the following pairs of solutions produces a precipitate when combined?

• Cu(NO₃)₂ and NaCl

• Cu(NO₃)₂ and K₂CO₃

• Fe(NO₃)₃ and MgCl₂

• CaCl₂ and NaNO₃

Which of the following is an example of an oxidation-reduction reaction?

• H⁺(aq) + OH^-(aq) ↔ H₂O(l)

• H₂CO₃ → H₂O + CO₂

• Zn(s) + Cu²⁺(aq) ↔ Zn²⁺(aq) + Cu

• The conversion of a base into its conjugate acid

• Pb(NO₃)₂(aq) + Na₂SO₄(aq) → 2 NaNO₃(aq) + PbSO₄(s)

What is the oxidation number of Magnesium in its ionic form?

• -1

• -2

• +7

• 0

• +2

Identify the oxidation half-reaction in this redox equation

Cu(s) + Cl₂(g) → Cu²⁺ + 2 Cl^-

• Cl₂ → 2 Cl^- + 2 e^-

• Cl₂ + 2 e^- → 2 Cl^-

• Cu → Cu²⁺ + 2 e^-

• Cu + 2 e^- → Cu²⁺

• Cu + Cl₂ + 2 e^- → Cu²⁺ + 2 Cl^- + 2 e^-

Use the activity series of metals to complete a balanced chemical equation for the following single replacement reaction. (assume a charge of +2 for the Cu)

Cu(s) + KNO(aq) →

• Cu(NO₃)₂ + K

• CuKNO₃

• CuK + NO₃

• No Reaction takes place

In a combustion reaction, one of the reactants is _.

• carbon dioxide

• hydrogen

• water

• oxygen

When the equation Fe₃O₄ + Al → Al₂O₃ + Fe is correctly balanced, what is the coefficient of Fe?

• 3

• 4

• 6

• 9

The reaction represented by the equation

Mg(s) + 2HCl(aq) → H₂(g) + MgCl₂(aq) is a

• single-replacement reaction

• combustion reaction

• decomposition reaction

• double-replacement reaction