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Zn + H ₂ O --> ZnO + H ₂

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Yi Quan, Brandon, Josiah, Leo, Hao Ming, Raja

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Yi Quan, Brandon, Josiah, Leo, Hao Ming, Raja

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Zinc has gained oxygen atoms and is oxidized to zinc oxide.
Water has lost oxygen atoms and has been reduced to hydrogen gas.
Hence, when both Zinc is oxidized and Water is Reduced at the same time, this is a redox reaction.

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Iron(III) oxide loses oxygen atoms and is reduced to iron.Carbon monoxide gain oygen atoms and is oxidised to carbon dioxide. This is a redox reaction as there is both oxidation and reduction happening at the same time.

Oxidising agent: Iron (III)oxide as it gives off oxygen
Reducing agent :Carbon monoxide as it takes in oxygen

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Iron(lll) oxide loses oxygen atoms and is reduced to iron. While Carbon monoxide gains oxygen atoms and oxidised to carbon dioxide. Iron (lll) oxide is reduced and carbon monoxide is oxidised at the same time. Hence this is a redox reaction
Since carbon monoxide gains oxygen atoms from iron(lll) oxide and becomes carbon dioxide. Therefore Iron(lll) oxide is the oxidising agent.
However, Iron(lll) oxide loses oxygen atoms to carbon monoxide and becomes iron. Therefore carbon monoxide is the reducing agent

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Ammonia lose hydrogen atoms and is oxidised to form nitrogen.The oxidising agent is ammonia. Copper II oxide lose oxygen atoms and is reduced to form Copper. The reducing agent is Copper II oxide. The hydrogen atoms lost, as well as the oxygen atoms lost forms water. Ammonia is oxidised, and copper II oxide is reduced at the same time, hence, redox reaction.

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Jackal, Javier, XueTing, Tessa, Wei xuan, Jingyu, Zhu Kou, ZunYaw

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Jackal, Javier, XueTing, Tessa, Wei xuan, Jingyu, Zhu Kou, ZunYaw

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From 2NH3 to N2 is oxidation and from CuO to 3Cu is reduction. Ammonia lose hydrogen and is oxidised to Nitrogen and Copper (II) oxide lose oxygen and is reduced to copper. Ammonia is oxidised and Copper (II) is reduced at the same time. Hence it’s a redox reaction.

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Yi Xuan, Lerine, Silvess, Mutiara, Jermaine

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Yi Xuan, Lerine, Silvess, Mutiara, Jermaine

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Lead sulfide gain oxygen atoms and is oxidised to lead sulfate. Hydrogen peroxide lose oxygen atoms and is reduced to water. lead sulfide is oxidised and hydrogen peroxide is reduced at the same time, hence it is a redox reaction.
Lead sulfide is the reducing agent as it reduces the hydrogen peroxide to water while hydrogen peroxide is the oxidising agent as it oxidises lead sulfide to lead sulfate.

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hydrogen peroxide loses 4 oxygen atoms to form water and is reduced
lead sulfide gains 4 oxygen atoms to form lead sulfate and is oxidised
this is a redox reaction as the hydrogen peroxide is reduced while lead sulfide is oxidised at the same time

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The redox agents are identified as oxidising or reducing because they oxidised or reduced the other reactant. Not because of what happened to itself.

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Should the stoichiometric ratio be written in the explanation?
I.e: 2NH3 and 3Cu
or NH₃ and Cu?

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How many oxygen atoms did H2O2 lose?

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9p I89