DP Chemistry Questionbank

• Syllabus

Topic 9: Redox processes

Sub sections and their related questions

9.1 Oxidation and reduction

• 15M.1.hl.TZ1.30: Which represents a redox reaction? A.    ...
• 15M.1.hl.TZ2.30: Which is a redox reaction? A.    ...
• 15M.2.hl.TZ1.6e: Bromine reacts with aqueous sodium...
• 15M.2.hl.TZ1.7a.ii: Determine the oxidation number of carbon in ethanol and ethanal.   Ethanol:   Ethanal:
• 15M.2.hl.TZ1.7a.iii: Deduce the half-equation for the oxidation of ethanol to ethanal.
• 15M.2.hl.TZ1.7a.iv: Deduce the overall redox equation for the reaction of ethanol to ethanal with acidified potassium...
• 15M.2.hl.TZ2.8b.i: State the name of ${\text{C}}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{3}}}$.
• 15M.2.hl.TZ2.8c.i: Chromium forms the complex ion...
• 15M.2.hl.TZ2.8d.i: The dichromate ion,...
• 15M.2.hl.TZ2.8d.ii: Explain in terms of oxidation numbers whether iodine is oxidized or reduced in part (d) (i).
• 15M.1.sl.TZ1.23: Which represents a redox reaction? A.    ...
• 15M.1.sl.TZ1.24: Which species can oxidize ethanol to ethanoic acid? A.     ${{\text{I}}^ - }$ B.     Fe C.  ...
• 15M.1.sl.TZ2.23: What are the oxidation states of each element in...
• 15M.1.sl.TZ2.24: What is the coefficient for I– when the following equation is balanced using the smallest...
• 15M.2.sl.TZ1.2d: Bromine reacts with aqueous sodium...
• 15M.2.sl.TZ1.7c.ii: Determine the oxidation number of carbon in ethanol and ethanal.   Ethanol:   Ethanal:
• 15M.2.sl.TZ1.7c.iii: Deduce the half-equation for the oxidation of ethanol to ethanal.
• 15M.2.sl.TZ1.7c.iv: Deduce the overall redox equation for the reaction of ethanol to ethanal with acidified potassium...
• 14M.1.hl.TZ2.31: Which species are the oxidizing and reducing agents in the following...
• 14M.2.hl.TZ1.6a: Alcohols with the molecular formula ${{\text{C}}_{\text{4}}}{{\text{H}}_{\text{9}}}{\text{OH}}$...
• 14M.2.hl.TZ2.5c: (i)     Deduce a balanced equation for the reaction between the chlorate(I) ion and sulfur...
• 14M.1.sl.TZ1.23: At which side of the equation are electrons, ${{\text{H}}^ + }$ ions and...
• 14M.1.sl.TZ1.24: What are the correct names for ${\text{KMn}}{{\text{O}}_{\text{4}}}$ and...
• 14M.1.sl.TZ2.23: What are the correct oxidation numbers of chromium in...
• 14M.2.sl.TZ1.6a: Define oxidation in terms of electron transfer.
• 14M.2.sl.TZ1.6b: (i)     Deduce the oxidation number of chromium in...
• 14M.2.sl.TZ2.4d: (i)     Deduce the coefficients required to balance the half-equations given below.   ___...
• 14M.3.sl.TZ1.16b: (i)     $1.50 \times {10^{ - 4}}{\text{ mol}}$ of ${{\text{I}}^ - }{\text{(aq)}}$ was formed...
• 14N.2.hl.TZ0.10a: (i)     Identify whether half-equation 1 represents oxidation or reduction, giving a reason for...
• 14N.3.hl.TZ0.24a: In an acidic soil, nitrate ions may undergo reduction to form ammonium ions. Deduce a...
• 14N.1.sl.TZ0.23: Which species of vanadium has a different oxidation number from the rest? A.    ...
• 14N.1.sl.TZ0.24: Which statement is correct for the following...
• 14N.2.sl.TZ0.8a: (i)     Identify whether half-equation 1 represents oxidation or reduction, giving a reason for...
• 13N.1.hl.TZ0.31: What is the name of ${\text{Mn}}{{\text{O}}_{\text{2}}}$? A.     Manganese(II) oxide B.    ...
• 13N.1.hl.TZ0.32: Consider the following...
• 13N.2.hl.TZ0.6b.i: State the initial and final oxidation numbers of titanium and hence deduce whether it is oxidized...
• 13N.3.hl.TZ0.9b.iv: The reducing agent in the cytochrome oxidase reaction is a species that can be denoted as...
• 13N.1.sl.TZ0.23: What is the name of...
• 13N.1.sl.TZ0.24: Consider the following...
• 13N.2.sl.TZ0.5a.i: State the initial and final oxidation numbers of titanium and hence deduce whether it is oxidized...
• 13N.2.sl.TZ0.5b.i: Deduce which of the species would react with titanium metal.
• 13N.2.sl.TZ0.5b.iii: Deduce which of the six species is the strongest oxidizing agent.
• 13N.2.sl.TZ0.5b.ii: Deduce the balanced equation for this reaction.
• 13M.2.hl.TZ1.4d: Deduce the half-equation involving ethanedioic acid.
• 13M.2.hl.TZ1.4e.i: The standard electrode potential for the half-equation involving ethanedioic acid...
• 13M.2.hl.TZ1.7b.iv: Deduce the oxidation number of iron in...
• 13M.1.sl.TZ1.23: Which statement is correct about a reducing agent? A.     It is reduced by gaining...
• 13M.1.sl.TZ1.24: What is the correct increasing order of reactivity of the metals X, Y and Z based on the...
• 13M.2.sl.TZ1.4a: Define oxidation in terms of electron transfer.
• 13M.2.sl.TZ1.4b: Calculate the change in oxidation numbers of carbon and manganese.   Carbon:       Manganese:
• 13M.2.sl.TZ1.4c: Identify the oxidizing and reducing agents.   Oxidizing agent:     Reducing agent:
• 13M.3.sl.TZ1.D2b.i: State the chemical formula for potassium dichromate(VI).
• 13M.3.sl.TZ1.D2b.iii: State the oxidation number of chromium in the product.
• 13M.2.hl.TZ2.7a: Define oxidation in terms of oxidation number.
• 13M.2.hl.TZ2.7b.i: Deduce the balanced chemical equation for the redox reaction of copper, Cu(s), with nitrate ions,...
• 13M.2.hl.TZ2.7b.ii: Deduce the oxidizing and reducing agents in this reaction.   Oxidizing agent:   Reducing agent:
• 13M.2.hl.TZ2.7c.iii: Deduce a balanced chemical equation, including state symbols, for the overall reaction which will...
• 13M.1.sl.TZ2.23: Which statement describes a reducing agent? A.     It is reduced and gains electrons. B.     It...
• 13M.1.sl.TZ2.24: Which is the oxidizing agent in the following...
• 13M.2.sl.TZ2.1d.i: Define the term reduction in terms of electrons.
• 13M.2.sl.TZ2.1d.ii: Deduce the oxidation number of manganese in the ${\text{MnO}}_{\text{4}}^ - {\text{(aq)}}$ ion.
• 13M.2.sl.TZ2.1f.i: One titration was abandoned because a brown precipitate, manganese(IV) oxide, formed. State the...
• 12N.1.sl.TZ0.23: What is the correct systematic name of MnO2? A.     Manganese(II) oxide B.     Manganese(IV)...
• 12N.2.sl.TZ0.5a: (i)     Define oxidation and reduction in terms of electron loss or...
• 10N.1.hl.TZ0.30: Consider the following...
• 10N.1.hl.TZ0.31: The following equations indicate reactions that occur...
• 10N.1.sl.TZ0.23: Consider the following...
• 10N.2.sl.TZ0.6b: (i)     Define oxidation in terms of oxidation numbers. (ii)     Deduce the oxidation states of...
• 10N.2.sl.TZ0.6g: Nitric acid reacts with silver in a redox reaction. __ ${\text{Ag(s)}} +$ __...
• 09N.1.hl.TZ0.29: Which compound contains nitrogen with an oxidation number of +3? A.     NH4Cl B.     HNO3 C.  ...
• 09N.1.sl.TZ0.24: Which are redox reactions? I.    ...
• 09N.2.sl.TZ0.1a: Deduce the balanced redox equation for this reaction in acidic solution.
• 09N.2.sl.TZ0.1b: Identify the reducing agent in the reaction.
• 09N.2.sl.TZ0.1c: Calculate the amount, in moles, of ${\text{MnO}}_4^ -$ used in the titration.
• 09N.2.sl.TZ0.4b: Both ${{\text{C}}_{\text{5}}}{{\text{H}}_{{\text{12}}}}$ and...
• 09N.3.sl.TZ0.C4a: State the change in oxidation number of the cadmium and deduce if it is acting as the positive or...
• 09N.3.sl.TZ0.E2a: State what is meant by the term biochemical oxygen demand (BOD).
• 10M.2.sl.TZ1.1: (a)     (i)     Deduce the change in the oxidation numbers of copper and nitrogen in step...
• 10M.2.sl.TZ1.5b: (i)     Deduce the order of reactivity of the four metals, cadmium, nickel, silver and zinc and...
• 10M.1.sl.TZ2.24: In which species does sulfur have an oxidation number of 0? A.    ...
• 10M.1.sl.TZ2.25: What is the reducing agent in the reaction...
• 10M.2.sl.TZ2.5c: (i)     Determine the oxidation number of lead in Pb, ${\text{Pb}}{{\text{O}}_{\text{2}}}$ and...
• 09M.2.hl.TZ1.4a.i: State the half-equation for the oxidation of the iron(II) ions.
• 09M.2.hl.TZ1.4a.ii: State the half-equation for the reduction of the ${\text{MnO}}_4^ -$ ions in acidic solution.
• 09M.2.hl.TZ1.4a.iii: Deduce the overall redox equation for the reaction.
• 09M.2.hl.TZ1.7a.iii: Deduce which species acts as the oxidizing agent when the cell is operating.
• 09M.2.hl.TZ1.7b.i: ${{\text{[Co(}}{{\text{H}}_{\text{2}}}{\text{O}}{{\text{)}}_{\text{6}}}{\text{]}}^{2 + }}$
• 09M.2.hl.TZ1.7b.ii: ${\text{C}}{{\text{o}}_{\text{2}}}{{\text{(S}}{{\text{O}}_{\text{4}}}{\text{)}}_{\text{3}}}$
• 09M.2.hl.TZ1.7b.iii: ${{\text{[CoC}}{{\text{l}}_{\text{4}}}{\text{]}}^{2 - }}$
• 09M.2.sl.TZ1.4a: Define oxidation in terms of electron transfer.
• 09M.2.sl.TZ1.4b.i: State the oxidation number of manganese in ${\text{KMn}}{{\text{O}}_{\text{4}}}$ and in...
• 09M.2.sl.TZ1.4b.ii: Deduce which species has been oxidized in this reaction and state the change in oxidation number...
• 09M.3.sl.TZ1.D3b.ii: State with a reason whether chromium in potassium dichromate(VI) is oxidised or reduced by ethanol.
• 09M.3.sl.TZ1.E2a: Outline the meaning of the term biochemical oxygen demand (BOD).
• 09M.3.sl.TZ1.E2c.i: State what happened to the ${{\text{O}}_{\text{2}}}$ in step 1 in terms of electrons.
• 09M.3.sl.TZ1.E2c.ii: State the change in oxidation number for manganese in step 2.
• 09M.1.sl.TZ2.12: Metal M has only one oxidation number and forms a compound with the formula...
• 09M.1.sl.TZ2.24: Which species is oxidized in the following...
• 09M.1.sl.TZ2.25: Which list represents the halogens in increasing order of oxidizing strength (weakest oxidizing...
• 09M.2.sl.TZ2.5b.i: Define oxidation in terms of oxidation numbers.
• 11M.1.hl.TZ1.36: What is the correct order of reaction types in the following sequence?
• 11M.2.hl.TZ1.9e.i: Deduce the oxidation number of the nitrogen in the reactants and product.
• 11M.2.hl.TZ1.9e.ii: Deduce the oxidation and reduction half-equations and identify the oxidizing agent for the reaction.
• 11M.1.sl.TZ1.23: Which species could be reduced to form ${\text{N}}{{\text{O}}_{\text{2}}}$? A.    ...
• 11M.1.sl.TZ1.25: What happens to the manganese in the following...
• 11M.2.hl.TZ2.7b.i: State the species which is the strongest oxidizing agent.
• 11M.2.hl.TZ2.7b.ii: Deduce which species can reduce ${\text{S}}{{\text{n}}^{4 + }}{\text{(aq)}}$ to...
• 11M.2.hl.TZ2.7b.iii: Deduce which species can reduce ${\text{S}}{{\text{n}}^{2 + }}{\text{(aq)}}$ to Sn(s) under...
• 11M.2.hl.TZ2.7d.ii: Deduce the oxidation number of chromium in ${\text{C}}{{\text{r}}_{\text{2}}}{\text{O}}_7^{2 - }$.
• 11M.2.hl.TZ2.7d.iii: State the balanced half-equation for the reduction of dichromate ions to chromium(III) ions.
• 11M.2.hl.TZ2.7e.i: Explain why it is very difficult to obtain sodium from sodium chloride by any other method.
• 11M.1.sl.TZ2.23: What happens to iodine when iodate ions, ${\text{IO}}_3^ -$, are converted to iodine...
• 11M.1.sl.TZ2.24: Consider the following reactions of three unknown metals X, Y and...
• 11M.2.sl.TZ2.2a.i: Deduce the oxidation number of antimony in stibnite.
• 11M.2.sl.TZ2.2a.ii: Deduce one other common oxidation number exhibited by antimony in some of its compounds.
• 11M.2.sl.TZ2.2b.i: Deduce the chemical equations for these two reactions.
• 11M.2.sl.TZ2.5b.iii: Deduce the overall equation for the reaction taking place in the voltaic cell and determine which...
• 12M.1.sl.TZ2.23: What is the name of ${\text{C}}{{\text{u}}_{\text{2}}}{\text{S}}$? A.     Copper(I)...
• 12M.1.sl.TZ2.24: Consider the following...
• 12M.2.sl.TZ2.1d: (i)     Deduce the oxidation numbers of oxygen present in each of the species below. (ii)   ...
• 11N.2.hl.TZ0.7a: Distinguish between the terms oxidation and reduction in terms of oxidation numbers.
• 11N.2.hl.TZ0.7b: State the names of ${\text{C}}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{3}}}$ and...
• 11N.2.hl.TZ0.7c.i: Define the term oxidizing agent.
• 11N.2.hl.TZ0.7c.ii: ${\text{C}}{{\text{r}}_{\text{2}}}{\text{O}}_7^{2 - }{\text{(aq)}}$ and...
• 11N.1.sl.TZ0.8: Which of the following redox reactions take place? I.    ...
• 11N.1.sl.TZ0.23: What is the correct decreasing order of reactivity of the metals X, Y and Z based on the...
• 11N.2.sl.TZ0.5a: Deduce the balanced chemical equation for the reaction between sodium and sulfur. State the...
• 16M.1.sl.TZ0.21: Applying IUPAC rules, what is the name of MnO2? A.  Magnesium(II) oxide B.  Manganese(II)...
• 16M.1.hl.TZ0.30: Applying IUPAC rules,...
• 16M.2.sl.TZ0.1b: Phosphine is usually prepared by heating white phosphorus, one of the allotropes of phosphorus,...
• 16M.2.hl.TZ0.1b: Phosphine is usually prepared by heating white phosphorus, one of the allotropes of phosphorus,...
• 16N.1.sl.TZ0.17: Which experimental methods could be used to observe the progress of the following...
• 16N.1.sl.TZ0.21: Which is a correct statement for the reaction below?  2MnO4-(aq) + 6H+(aq) + 5NO2-(aq) →...
• 16N.2.sl.TZ0.1b: Determine the average oxidation state of carbon in ethene and in...
• 16N.2.sl.TZ0.4g: Magnesium chloride can be electrolysed. Deduce the half-equations for the reactions at each...
• 16N.2.hl.TZ0.4i: Magnesium chloride can be electrolysed. (i) Deduce the half-equations for the reactions at each...
• 16N.3.sl.TZ0.1c: Despite widespread improvements in the provision of safe drinking water, the sale of bottled...
• 17M.1.sl.TZ1.21: What is the order of decreasing reactivity of the metals (most reactive first)? Zn(s) + Sn2+(aq)...
• 17M.1.sl.TZ1.22: What is the oxidation half-equation in the redox reaction? 2S2O32–(aq) + I2(aq) → S4O62–(aq) +...
• 17M.1.hl.TZ1.28: Which change represents oxidation? A.     HClO4 to HClO3 B.     N2 to NH3 C.     N2O to NO D....
• 17M.1.hl.TZ1.29: A reaction takes place when a rechargeable battery is used: Pb(s) + PbO2(s) + 4H+(aq) +...
• 17M.2.sl.TZ1.1a.i: Suggest how the change of iodine concentration could be followed.
• 17M.2.sl.TZ1.3a: Determine the oxidation state of vanadium in each of the following species.
• 17M.2.sl.TZ1.3b: Formulate an equation for the reaction between VO2+(aq) and V2+(aq) in acidic solution to form...
• 17M.2.hl.TZ1.3b.i: Identify, from the table, a non-vanadium species that can reduce VO2+(aq) to V3+(aq) but no further.
• 17M.2.hl.TZ1.3b.ii: Identify, from the table, a non-vanadium species that could convert...
• 17M.2.hl.TZ1.3c.i: Formulate an equation for the reaction between VO2+(aq) and V2+(aq) in acidic solution to form...
• 17M.2.hl.TZ1.4a: Formulate an equation for the oxidation of nickel(II) sulfide to nickel(II) oxide.
• 17M.2.hl.TZ1.4b: The nickel obtained from another ore, nickeliferous limonite, is contaminated with iron. Both...
• 17M.2.hl.TZ1.4d: Suggest why experiments involving tetracarbonylnickel are very hazardous.
• 17M.1.sl.TZ2.19: Which of the following does not react with dilute HCl(aq)? A.     Na2CO3 B.     Cu C.    ...
• 17M.1.sl.TZ2.21: Which element is reduced in the following decomposition? (NH4)2Cr2O7(s) → N2(g) + Cr2O3(s) +...
• 17M.1.sl.TZ2.22: Which of the following is not a redox reaction? A.     CH4(g) + Cl2(g) → CH3Cl(g) + HCl(g) B.  ...
• 17M.1.hl.TZ2.28: Which element is reduced in the following decomposition? (NH4)2Cr2O7(s) → N2(g) + Cr2O3(s) +...
• 17M.1.hl.TZ2.36: Which compounds can be reduced? I.     C2H4II.     CH3COOHIII.     CH3CHO A.     I and II...
• 17M.2.sl.TZ2.2a.i: State the oxidation half-equation.
• 17M.2.sl.TZ2.2a.ii: Deduce the overall redox equation for the reaction between acidic Sn2+(aq) and Cr2O72–(aq), using...
• 17M.2.sl.TZ2.4a.iii: Determine the oxidation state of nitrogen in the two reactants.
• 17M.2.sl.TZ2.4a.iv: Deduce, giving a reason, which species is the reducing agent.
• 17M.3.sl.TZ2.5b.i: Nickel is also used as a catalyst. It is processed from an ore until nickel(II) chloride solution...
• 17M.3.sl.TZ2.5b.ii: Deduce the redox equation for the reaction of nickel(II) chloride solution with the metal...
• 17N.1.sl.TZ0.21: What are the oxidation states of chromium in (NH4)2Cr2O7 (s) and Cr2O3 (s)?
• 17N.1.sl.TZ0.22: Which of the following is a redox reaction? A. 3Mg (s) + 2AlCl3 (aq) → 2Al (s) + 3MgCl2 (aq) B....
• 17N.1.hl.TZ0.30: Consider the following half-equations: I2 (s) + 2e– $\rightleftharpoons$ 2I– (aq)           ...
• 17N.2.sl.TZ0.2e.i: Identify the strongest reducing agent in the given list.
• 17N.2.hl.TZ0.7d: Identify the best reducing agent in the table above.
• 18M.2.hl.TZ2.4a: In acidic solution, bromate ions, BrO3−(aq), oxidize iodide ions, I−(aq). BrO3−(aq) + 6H+(aq) +...
• 18M.1.sl.TZ1.21: Which equation shows oxygen undergoing reduction? A.     2F2 + O2 → 2F2O B.     Na2O + H2O →...
• 18M.1.sl.TZ1.23: Which coefficients correctly balance this redox equation? aFe2+(aq) + MnO4−(aq) + bH+(aq) →...
• 18M.1.sl.TZ2.21: Which element has the same oxidation number in both species? A.     C in C2H4 and CO2 B.     H...
• 18M.1.sl.TZ2.22: Which can describe oxidation? A.     Loss of hydrogen B.     Decrease in oxidation number C. ...

9.2 Electrochemical cells

• 15M.2.hl.TZ1.6d.i: Bromine can be produced by the electrolysis of molten sodium bromide. Deduce the half-equation...
• 15M.1.sl.TZ1.25: Two half-cells are connected via a salt bridge to make a voltaic cell. Which statement about this...
• 15M.1.sl.TZ2.25: A voltaic cell is made by connecting a copper half-cell,...
• 15M.2.sl.TZ1.2c: Bromine can be produced by the electrolysis of molten sodium bromide. Deduce the half-equation...
• 15M.2.sl.TZ2.3a.i: Describe, using a labelled diagram, the essential components of this electrolytic cell.
• 15M.2.sl.TZ2.3a.ii: Molten magnesium chloride can be electrolysed using inert graphite electrodes at 800 °C. Deduce...
• 14M.2.hl.TZ1.6b: (i)     Deduce the order of reactivity of these four metals, from the least to the most...
• 14M.2.hl.TZ2.8g: (i)     Draw a labelled diagram of a suitable apparatus for the electrolysis.   (ii)     State...
• 14M.1.sl.TZ1.25: At which electrodes does oxidation occur in a voltaic cell and in an electrolytic cell?
• 14M.1.sl.TZ2.24: Zinc is more reactive than copper. In this voltaic cell, which species is reduced and in which...
• 14M.1.sl.TZ2.25: Which process occurs when a molten salt is electrolysed? A.     The metal ion is oxidized and...
• 14M.2.sl.TZ1.6c: (i)     Draw a labelled electrolytic cell for the electrolysis of molten potassium bromide, KBr....
• 14M.2.sl.TZ1.6d: (i)     Deduce the order of reactivity of these four metals, from the least to the most...
• 14N.1.hl.TZ0.31: Which species are produced at each electrode during the electrolysis of molten lead(II) bromide,...
• 14N.1.sl.TZ0.25: Which statement about an electrolytic cell is correct? A.     Chemical energy is converted to...
• 14N.2.sl.TZ0.8c: (i)     Given that magnesium is more reactive than silver, deduce the half-equations for the...
• 14N.3.sl.TZ0.8a: Deduce an equation for the discharge of the ions at each electrode.   Positive electrode...
• 13N.1.sl.TZ0.25: Which statements are correct for the electrolysis of molten lead(II) bromide,...
• 13N.2.sl.TZ0.5b.iv: A voltaic cell can be constructed using cadmium and europium half-cells. State how the two...
• 13M.1.hl.TZ1.32: Which are correct statements about a voltaic cell? I.     A spontaneous redox reaction occurs...
• 13M.2.hl.TZ1.7c.i: Describe, using a diagram, the essential components of an electrolytic cell.
• 13M.2.hl.TZ1.7c.ii: Describe the two ways in which current is conducted in an electrolytic cell.
• 13M.2.sl.TZ1.3b: Sodium can be obtained by electrolysis from molten sodium chloride. Describe, using a diagram,...
• 13M.2.hl.TZ2.7e.v: Deduce the overall cell reaction, including state symbols.
• 13M.2.hl.TZ2.7e.vi: Draw a fully labelled diagram of the electrolytic cell, showing the positive electrode (anode)...
• 12N.1.sl.TZ0.24: A voltaic cell is made by connecting zinc and lead half-cells. The overall equation for the...
• 12N.1.sl.TZ0.25: Which process occurs during the electrolysis of molten sodium chloride? A.     Oxidation occurs...
• 10N.2.hl.TZ0.4b: (i)     Explain how molten magnesium chloride conducts an electric current. (ii)     Identify...
• 10N.1.sl.TZ0.24: Metal A is more reactive than metal B. A standard voltaic cell is made as shown. Which...
• 10N.1.sl.TZ0.25: Which statement is correct for the electrolysis of molten lead iodide,...
• 09N.1.hl.TZ0.30: In the electrolytic cell shown, at which electrode will chlorine form, and what is the process...
• 09N.2.hl.TZ0.4a: Outline two differences between an electrolytic cell and a voltaic cell.
• 09N.2.hl.TZ0.4b.iii: On the cell diagram below, label the negative electrode (anode), the positive electrode (cathode)...
• 10M.2.sl.TZ1.5a: (i)     Draw an annotated diagram of a voltaic cell composed of a magnesium electrode in...
• 10M.2.sl.TZ1.5c: (i)     Solid sodium chloride does not conduct electricity but molten sodium chloride does....
• 10M.1.sl.TZ2.26: Which changes could take place at the positive electrode (cathode) in a voltaic cell? I.    ...
• 10M.2.sl.TZ2.5c: (i)     Determine the oxidation number of lead in Pb, ${\text{Pb}}{{\text{O}}_{\text{2}}}$ and...
• 09M.2.hl.TZ1.7d.i: concentrated sodium chloride
• 09M.2.hl.TZ1.7d.ii: molten sodium bromide
• 09M.1.sl.TZ1.24: What happens at the negative electrode in a voltaic cell and in an electrolytic cell?
• 09M.1.sl.TZ1.25: Consider how current is conducted in an electrolytic cell. Which statement is correct? A.   ...
• 09M.2.sl.TZ1.3b: Molten sodium oxide is a good conductor of electricity. State the half-equation for the reaction...
• 09M.2.hl.TZ2.6c.i: Outline two differences between an electrolytic cell and a voltaic cell.
• 09M.2.sl.TZ2.5b.ii: Describe using a labelled diagram, the essential components of an electrolytic cell.
• 09M.2.sl.TZ2.5b.iv: Molten sodium chloride undergoes electrolysis in an electrolytic cell. For each electrode deduce...
• 09M.2.sl.TZ2.5b.v: Electrolysis has made it possible to obtain reactive metals such as aluminium from their ores,...
• 09M.2.sl.TZ2.5b.vi: Outline two differences between an electrolytic cell and a voltaic cell.
• 11M.2.hl.TZ1.9a.i: Draw an electrolytic cell illustrating the electrolysis of molten nickel(II) bromide,...
• 11M.1.sl.TZ1.24: Consider the overall reaction taking place in a voltaic...
• 11M.2.hl.TZ2.7c.i: Draw a labelled diagram of a voltaic cell made from an Fe (s) /...
• 11M.2.hl.TZ2.7c.ii: Deduce the equation for the chemical reaction occurring when the cell in part (c) (i) is...
• 11M.2.hl.TZ2.7e.i: Explain why it is very difficult to obtain sodium from sodium chloride by any other method.
• 11M.1.sl.TZ2.25: Which statement about the electrolysis of molten sodium chloride is correct? A.     A...
• 11M.2.sl.TZ2.5b.i: Draw a labelled diagram of a voltaic cell made from an...
• 11M.2.sl.TZ2.5b.ii: Deduce the half-equations for the reactions taking place at the positive electrode (cathode) and...
• 12M.1.sl.TZ2.25: What occurs during the operation of a voltaic cell based on the following overall...
• 11N.1.sl.TZ0.24: What is produced at the positive electrode (anode) and negative electrode (cathode) during the...
• 11N.2.sl.TZ0.3a.i: Draw the essential components of this electrolytic cell and identify the products that form at...
• 11N.2.sl.TZ0.3a.ii: State the half-equations for the oxidation and reduction processes and deduce the overall cell...
• 16M.1.sl.TZ0.22: Which statement is correct for a voltaic but not for an electrolytic cell? A.  An electrolyte is...
• 16M.1.hl.TZ0.31: Which statement...
• 16N.1.sl.TZ0.22: A voltaic cell is constructed from zinc and copper half-cells. Zinc is more reactive than copper....
• 16N.2.sl.TZ0.4g: Magnesium chloride can be electrolysed. Deduce the half-equations for the reactions at each...
• 16N.2.hl.TZ0.4i: Magnesium chloride can be electrolysed. (i) Deduce the half-equations for the reactions at each...
• 17M.1.sl.TZ1.23: Which statements are correct for a voltaic...
• 17M.1.sl.TZ2.23: What occurs at the anode (positive electrode) during the electrolysis of molten strontium...
• 17N.1.sl.TZ0.23: What is the reaction type and major product at the anode (positive electrode) when molten...
• 17N.2.sl.TZ0.2e.ii: A voltaic cell is made up of a Mn2+/Mn half-cell and a Ni2+/Ni half-cell. Deduce the equation...
• 17N.2.sl.TZ0.2e.iii: The voltaic cell stated in part (ii) is partially shown below. Draw and label the connections...
• 17N.2.hl.TZ0.7a: Deduce a balanced equation for the overall reaction when the standard nickel and iodine...
• 17N.2.hl.TZ0.7b: Predict, giving a reason, the direction of movement of electrons when the standard nickel and...
• 17N.3.sl.TZ0.1a: Sketch a graph that would support the student’s hypothesis.
• 17N.3.sl.TZ0.1b.iii: Outline how current flows in the sodium chloride solution.
• 18M.2.hl.TZ1.6a: Identify the missing component of the cell and its function.
• 18M.2.hl.TZ1.6b: Deduce the half-equations for the reaction at each electrode when current flows.  
• 18M.2.hl.TZ1.6c: Annotate the diagram with the location and direction of electron movement when current flows.
• 18M.2.hl.TZ2.3c.iv: Deduce any change in the colour of the electrolyte during electrolysis.
• 18M.1.sl.TZ1.22: What are the products of electrolysis when molten calcium bromide is electrolysed using graphite...
• 18M.2.sl.TZ1.6a: Identify the missing component of the cell and its function.
• 18M.2.sl.TZ1.6b: Deduce the half-equations for the reaction at each electrode when current flows.
• 18M.2.sl.TZ1.6c: Annotate the diagram with the location and direction of electron movement when current flows.
• 18M.1.sl.TZ2.23: What are the products of the electrolysis of molten zinc bromide?
• 18M.2.sl.TZ2.3c.ii: Impure copper can be purified by electrolysis. In the electrolytic cell, impure copper is the...
• 18M.2.sl.TZ2.3c.iii: Outline where and in which direction the electrons flow during electrolysis.