Lesson 3.1.3
3.1.3 Ionic half-equations Quiz: Pearson Edexcel Chemistry, Unit 3
20 questions
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Lesson 3.1.3, Ionic half-equations: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 3: Redox I, written with Revision Ninja.
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The 20 questions
-
What particles are explicitly included in ionic half-equations to balance charge changes?
- Neutrons
- Spectator ions
- Protons
- Electrons
-
Which is the correct half-equation for oxidation of Fe2+ to Fe3+?
- Fe2+ -> Fe3+ + e-
- Fe2+ + e- -> Fe+
- Fe2+ + 2e- -> Fe
- Fe3+ + e- -> Fe2+
-
Which half-equation shows reduction of chlorine?
- 2Cl- -> Cl2 + 2e-
- Cl2 -> 2Cl- + 2e-
- Cl2 + 2e- -> 2Cl-
- Cl- + e- -> Cl2
-
Which is the correct half-equation for the reduction of MnO4- in acid?
- MnO4- + 8H+ -> Mn2+ + 4H2O
- MnO4- + 8H+ + 5e- -> Mn2+ + 4H2O
- MnO4- + 8H+ + 3e- -> Mn2+ + 4H2O
- MnO4- + 5e- -> Mn2+
-
How many Fe2+ ions react with one Cl2 molecule in their balanced redox reaction?
- One
- Four
- Three
- Two
-
Which principle requires electrons lost to equal electrons gained in redox reactions?
- Conservation of mass
- Conservation of charge
- Hess's law
- Le Chatelier's principle
-
Which half-equation shows the oxidation of bromide ions?
- Br2 + 2e- -> 2Br-
- Br2 -> 2Br+ + 2e-
- 2Br- -> Br2 + 2e-
- Br- + e- -> Br
-
What is the correct ionic equation for chlorine displacing bromide ions?
- Cl + Br- -> Cl- + Br
- Cl2 + 2Br- -> 2Cl- + Br2
- Cl2 + Br- -> Cl- + Br2
- Cl2 + 2Br -> 2Cl + Br2
-
Which half-equation is balanced correctly for the reduction of Cu2+?
- Cu2+ + 2e- -> Cu
- Cu2+ -> Cu + 2e-
- Cu2+ + 2e- -> Cu2
- Cu2+ + e- -> Cu
-
What is the ionic equation for zinc metal reacting with copper(II) ions?
- Zn + Cu2+ -> Zn2+ + Cu
- Zn + Cu -> Zn2+ + Cu2+
- Zn2+ + Cu -> Zn + Cu2+
- Zn + 2Cu+ -> Zn2+ + 2Cu
-
What must balance on both sides of any correct ionic half-equation?
- Total overall charge
- Total mass only
- State symbols only
- Number of molecules
-
Which is the correct half-equation for the reduction of hydrogen ions to hydrogen gas?
- 2H+ -> H2 + 2e-
- 2H+ + 2e- -> H2
- H+ + e- -> H2
- H+ + 2e- -> H2
-
Which half-equation shows the oxidation of sulfite ions to sulfate ions?
- SO3 2- + H2O + 2e- -> SO4 2-
- SO3 2- + H2O -> SO4 2- + 2H+ + 2e-
- SO3 2- -> SO4 2- + 2e-
- SO3 2- + 2H+ -> SO4 2- + 2e-
-
What key information do ionic half-equations explicitly show?
- Electron transfer
- Activation energy
- Reaction rate
- Enthalpy change
-
What is the overall equation when Mg oxidises and Ag+ reduces?
- Mg + Ag2+ -> Mg2+ + 2Ag
- Mg + 2Ag+ -> Mg2+ + 2Ag
- Mg2+ + Ag -> Mg + 2Ag+
- Mg + Ag+ -> Mg2+ + Ag
-
What is the ionic equation for chlorine reacting with cold dilute sodium hydroxide?
- Cl2 + OH- -> Cl- + ClO3- + H2O
- Cl2 + H2O -> HCl + HClO
- Cl2 + 2OH- -> Cl- + ClO- + H2O
- 2Cl2 + 4OH- -> 4Cl- + O2 + 2H2O
-
What type of process is represented by a half-equation with electrons on the reactant side?
- Oxidation
- Reduction
- Neutralisation
- Disproportionation
-
Where are electrons placed in the half-equation for the oxidation of Fe2+ to Fe3+?
- Both sides
- Neither side
- Product side
- Reactant side
-
Which set of half-equations, when combined, gives 2I- + Cl2 -> I2 + 2Cl-?
- I- -> I2 + e- and Cl2 + e- -> Cl-
- I2 -> 2I- + 2e- and 2Cl- -> Cl2 + 2e-
- 2I- -> I2 + 2e- and Cl2 + 2e- -> 2Cl-
- 2I- + 2e- -> I2 and Cl2 -> 2Cl- + 2e-
-
Which half-equation is balanced for the oxidation of iodide to iodine?
- 2I- -> I2 + 2e-
- I- -> I2 + e-
- I2 -> 2I- + e-
- 2I- + 2e- -> I2
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