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Date	May 2014	Marks available	1	Reference code	14M.1.sl.TZ1.23
Level	SL	Paper	1	Time zone	TZ1
Command term		Question number	23	Adapted from	N/A

Question

At which side of the equation are electrons, ${{\text{H}}^ + }$ ions and ${{\text{H}}_{\text{2}}}{\text{O}}$ needed to complete the half-equation?

${\text{MnO}}_4^ - {\text{(aq)}} \to {\text{M}}{{\text{n}}^{2 + }}{\text{(aq)}}$

M14/4/CHEMI/SPM/ENG/TZ1/23

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Core » Topic 9: Redox processes » 9.1 Oxidation and reduction

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17N.2.hl.TZ0.7d: Identify the best reducing agent in the table above.
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17M.2.hl.TZ1.4d: Suggest why experiments involving tetracarbonylnickel are very hazardous.
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17M.2.sl.TZ1.3a: Determine the oxidation state of vanadium in each of the following species.
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17M.1.hl.TZ1.29: A reaction takes place when a rechargeable battery is used: Pb(s) + PbO2(s) + 4H+(aq) +...
17M.1.hl.TZ1.28: Which change represents oxidation? A. HClO4 to HClO3 B. N2 to NH3 C. N2O to...
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17M.1.sl.TZ1.21: What is the order of decreasing reactivity of the metals (most reactive first)? Zn(s) +...
16N.3.sl.TZ0.1c: Despite widespread improvements in the provision of safe drinking water, the sale of bottled...
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16N.2.sl.TZ0.4g: Magnesium chloride can be electrolysed. Deduce the half-equations for the reactions at each...
16N.2.sl.TZ0.1b: Determine the average oxidation state of carbon in ethene and in...
16N.1.sl.TZ0.21: Which is a correct statement for the reaction below? 2MnO4-(aq) + 6H+(aq) + 5NO2-(aq) →...
16N.1.sl.TZ0.17: Which experimental methods could be used to observe the progress of the following...
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16M.2.sl.TZ0.1b: Phosphine is usually prepared by heating white phosphorus, one of the allotropes of...
16M.1.hl.TZ0.30: Applying IUPAC...
16M.1.sl.TZ0.21: Applying IUPAC rules, what is the name of MnO2? A. Magnesium(II) oxide B. Manganese(II)...
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...
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15M.2.hl.TZ1.7a.iv: Deduce the overall redox equation for the reaction of ethanol to ethanal with acidified...
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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. ...
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...
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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...
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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.1.sl.TZ1.24: What are the correct names for ${\text{KMn}}{{\text{O}}_{\text{4}}}$ and...
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14M.2.sl.TZ2.4d: (i) Deduce the coefficients required to balance the half-equations given below. ___...
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14N.1.sl.TZ0.24: Which statement is correct for the following...
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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...
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.TZ0.24: Consider the following...
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13N.1.sl.TZ0.23: What is the name of...
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13M.2.hl.TZ1.4e.i: The standard electrode potential for the half-equation involving ethanedioic acid...
13M.2.hl.TZ1.4d: Deduce 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.TZ1.4b: Calculate the change in oxidation numbers of carbon and...
13M.2.sl.TZ1.4a: Define oxidation in terms of electron transfer.
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13M.3.sl.TZ1.D2b.iii: State the oxidation number of chromium in the product.
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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...
13M.2.hl.TZ2.7c.iii: Deduce a balanced chemical equation, including state symbols, for the overall reaction which...
13M.1.sl.TZ2.23: Which statement describes a reducing agent? A. It is reduced and gains electrons. B. ...
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13M.2.sl.TZ2.1d.ii: Deduce the oxidation number of manganese in the ${\text{MnO}}_{\text{4}}^ - {\text{(aq)}}$ ...
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12N.1.sl.TZ0.23: What is the correct systematic name of MnO2? A. Manganese(II) oxide B. ...
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...
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09N.1.hl.TZ0.29: Which compound contains nitrogen with an oxidation number of +3? A. NH4Cl B. ...
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09N.2.sl.TZ0.1c: Calculate the amount, in moles, of ${\text{MnO}}_4^ -$ used in the titration.
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09N.2.sl.TZ0.1b: Identify the reducing agent in the reaction.
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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...
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09M.2.hl.TZ1.4a.iii: Deduce the overall redox equation for the reaction.
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09M.2.hl.TZ1.7b.iii: ${{\text{[CoC}}{{\text{l}}_{\text{4}}}{\text{]}}^{2 - }}$
09M.2.hl.TZ1.7b.ii: ${\text{C}}{{\text{o}}_{\text{2}}}{{\text{(S}}{{\text{O}}_{\text{4}}}{\text{)}}_{\text{3}}}$
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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...
09M.3.sl.TZ1.E2c.i: State what happened to the ${{\text{O}}_{\text{2}}}$ in step 1 in terms of electrons.
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09M.3.sl.TZ1.E2c.ii: State the change in oxidation number for manganese in step 2.
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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...
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11M.1.hl.TZ1.36: What is the correct order of reaction types in the following sequence?
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11M.2.hl.TZ1.9e.ii: Deduce the oxidation and reduction half-equations and identify the oxidizing agent for the...
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.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...
11M.2.hl.TZ2.7e.i: Explain why it is very difficult to obtain sodium from sodium chloride by any other method.
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11M.2.hl.TZ2.7d.iii: State the balanced half-equation for the reduction of dichromate ions to chromium(III) ions.
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.1.sl.TZ2.23: What happens to iodine when iodate ions, ${\text{IO}}_3^ -$ , are converted to iodine...
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.
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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...
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