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level: Oxidising and Reducing Agents

Questions and Answers List

level questions: Oxidising and Reducing Agents

QuestionAnswer
what is oxidation?the loss of electrons by a reactant in any reaction
what is reduction?the gain of the electrons by a reactant in any reaction
what are the steps in writing balanced ion-electron equations for reactions not found in your data booklet?balance oxygen atoms with water molecules balance hydrogen atoms with hydrogen ions balance the charges with electrons
write out the balanced ion electron equation for MnO4- (aq) → Mn2+ (aq)Balance any oxygen atoms with water molecules MnO4- (aq) → Mn2+ (aq) + 4H2O (l) Balance any H atoms with H+(aq) ions MnO4- (aq) + 8H+ (aq) → Mn2+ (aq) + 4H2O (l) Balance the charges with electrons MnO4- (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (l)
how can you tell if a reaction is a redox reaction?reaction involves metal atoms as a reactant or a product reaction involves molecules and ions of the same non-metal reaction involves a metal ion with two different charges sulfate reacting to form sulfite and vice versa
in redox reactions, what type of ions are sodium and potassium?spectator ions
are neutralisation reactions redox reactions?no
are precipitation reactions redox reactions?no
what is an oxidising agenta substance which accepts electrons during a chemical reaction (it is reduced)
what is a reducing agenta substance which donates/loses electrons during a chemical reaction (it is oxidised)
do elements with low electronegativities act as reducing or oxidising agents?reducing agents as they tend to form ions by losing electrons
do elements with high electronegativities act as reducing or oxidising agents?oxidising agents as they tend to form ions by gaining electrons
where are the strongest oxidising and reducing agents found on the periodic table?strongest reducing agents are in group 1 strongest oxidising agents are in group 7
where are the strongest oxidising and reducing agents found on the electrochemical series?strongest oxidising agents: bottom left corner strongest reducing agents: top right corner
what is a practical use of oxidising agentsthey can kill bacteria and fungi and inactivate viruses
why are oxidising agents ideal for use as bleach for clothes and hair?the oxidation process is an effective means of breaking down coloured compounds
name a practical use of hydrogen peroxidean oxidising agent that can be used to bleach hair, teeth, cotton, wool and paper
name a practical use of dichromate and permanganate ionsthey are group ions that are strong oxidising agents in acidic solutions used to treat skin infections used to keep water in fish tanks and ponds free from fungi and bacteria
what is a practical use of iodine as an oxidising agent?can be used to treat burns or wounds by keeping them free of infections
what is a use of carbon monoxide?reducing agent can extract some metals from their ores