a) Classify the following changes in each unbalanced chemical equation as oxidat
ID: 1034630 • Letter: A
Question
a) Classify the following changes in each unbalanced chemical equation as oxidation or reduction, using the definitions in the introduction. Drag the appropriate items to their respective bins (which oxidation or reduction).
Mg+Mg^2+ + 2e-
NO2 ---> N2O5
Cr^6+ +3e- ---> Cr3+
C3H8O ---->> C3H6O
PbO2 ---> PbO
C5H6---->C5H8
Oxidation:
Reduction:
b)The three reactions shown are all examples of oxidation and reduction. Classify the reactants in these chemical equations based on whether they are oxidized or reduced, using the definitions in the introduction.
Iron in Fe2O3 + 2AL---> Fe + Al2O3
Copper in Mg + Cu2+ --> Mg2 +Cu
Magnesium in mg + Cu2+ ---> Mg2 + Cu
Oxygen in CH4 + 2O2 -->> CO2 + 2H2O
Carbon in CH4 + 2O2 ----> CO2 + 2H2O
Aluminum in Fe2O3 + 2Al ---> 2Fe + Al2O3
Element is oxidized:
Element is reduced:
Explanation / Answer
Oxidation:
The element which looses electrons in a reaction then we can say it undergone oxidation.
Reduction:
The element which gains electrons in a reaction then we can say it undergone Reduction.
Mg -----> Mg+2 + 2e- in this Mg looses electrons so it undergone oxidation
NO2 -----> N2O5
Oxidation state of N in NO2 = +4
Oxidation state of N in N2O5 = +5
In the above reaction NO2 looses electron, so it is oxidation reaction.
Cr+6 + 3e- -------> Cr+3 in this Cr+6 gain electrons so it undergone reduction.
PbO2 -----> PbO
Oxidation state of N in PbO2 = +4
Oxidation state of N in PbO = +2
In the above reaction PbO2 gains electron, so it is redution reaction.
C5H6 ----> C5H8
In the above reaction there is increasing in number of H atoms so it is a reduction reaction.
Iron in Fe2O3 + 2Al---> Fe + Al2O3
in the above reaction Fe+3 change to Fe0. so Fe+3 gains electrons so it is a reduction reaction.
Copper in Mg + Cu2+ --> Mg2 +Cu
in the above reaction Cu+2 change to Cu0. so Cu+2 gains electrons so it is a reduction reaction.
Magnesium in Mg + Cu2+ ---> Mg2+ + Cu
in the above reaction Mg change to Mg+2. so Mg looses electrons so it is a oxidation reaction.
Carbon in CH4 + 2O2 ----> CO2 + 2H2O
in the above reaction C-4 in CH4 change to C+4 in CO2. so C looses electrons so it is a oxidation reaction.
Oxygen in CH4 + 2O2 ---> CO2 + 2H2O
in the above reaction Oxygen 0 in O2 change to O-2 in CO2. so C gains electrons so it is a reduction reaction.
Aluminum in Fe2O3 + 2Al ---> 2Fe + Al2O3
in the above reaction Al0 change to Al+3 in Al2O3. so Al looses electrons so it is a oxidation reaction.
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