Quick answer: A net ionic equation shows only the species that change, leaving out spectator ions. This AP Chemistry test on net ionic equation has 8 questions worth 20 marks, to do in 45 minutes: oxidation numbers, net ionic equation and predict precipitates. The mark scheme is on a separate page; free printable PDF.
This test lasts 45 minutes and is worth 20 points. Write balanced equations with states, show all steps of calculations and use units. In explanations, refer to the particles and the stoichiometry.
Level: AP Chemistry · Curriculum: AP Chem Unit 4
Question 1 Oxidation numbers (2 marks)
State the oxidation number of Mn in KMnO₄ and of S in H₂SO₃.Question 2 Net ionic equation (3 marks)
Write the balanced net ionic equation for the reaction of aqueous silver nitrate with aqueous sodium carbonate, which forms a precipitate of Ag₂CO₃.Question 3 Predict precipitates (2 marks)
Will a precipitate form on mixing aqueous solutions of (a) KCl and Pb(NO₃)₂, (b) NaNO₃ and CaCl₂? Name any precipitate.Question 4 Titration calculation (3 marks)
A 20.00 mL sample of KOH requires 15.60 mL of 0.1200 M HCl to neutralise it. Calculate c(KOH).Question 5 Limiting reagent (3 marks)
20.0 mL of 0.250 M BaCl₂ is mixed with 30.0 mL of 0.100 M Na₂SO₄. Identify the limiting reagent and calculate the mass of BaSO₄ (233.39 g/mol).Question 6 Redox agents (2 marks)
In 2Al(s) + 3Cu²⁺(aq) → 2Al³⁺(aq) + 3Cu(s), identify the oxidising agent and the reducing agent.Question 7 Titration curve (3 marks)
- State the volume and pH at the equivalence point. (1 mark)
- Calculate the concentration of the acid. (2 marks)
Question 8 Spectator ions (2 marks)
Explain what a spectator ion is and identify the spectator ions when HCl(aq) reacts with NaOH(aq).
