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REDUCTION AND OXIDATION ACTIVITYActivity 11) The tables below
describe the meaning of oxidation and reduction in terms of
(a) loss or gain of oxygen(b) loss or gain of hydrogen(c)
transfer of electrons
(d) changes in oxidation number
Study each table below carefully and fill in the blanks.(a) Loss
or gain of oxygen
Loss or gain of oxygen
Oxidation ReductionThe process of gaining oxygen The process of
losing oxygen
Example :Mg + PbO MgO + Pb
In the above redox reaction,
Mg gains oxygen to form MgO. This process is called. ..
PbO loses oxygen to form Pb. This process is called .....
Mg is a reducing agent because it .. lead(II) oxide to .
PbO is an oxidizing agent because it magnesium to..
(b)Loss or gain of hydrogen
Loss or gain of hydrogenOxidation Reduction
The process of losing hydrogen The process of gaining
hydrogen
Example :
H2S + Cl2
2HCl + SIn the above redox reaction
H2S loses hydrogen to form S. The process is called .. ...
Cl2gains hydrogen to form HCl. This process is called .. .
H2S is a reducing agent because it to ...
Cl2is an oxidizing agent because it to..
(c) Transfer of electrons
Transfer of electrons
Oxidation ReductionThe process of losing electrons The process
of gaining oxygen
Example :Redox reaction: 2Na + Cl2 2NaClHalf-equations: Na Na+ +
e // Cl2 + 2e 2Cl
In the half-equations above,
Na atom loses electron to form Na+. This process is called
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Cl2 molecule gains electrons to form 2Cl. This process is called
..
Na is a reducing agent because it to ..
Cl2 is an oxidizing agent because it ..to .
(d) Changes in oxidation numberChanges in oxidation number
Oxidation Reduction
The increase in oxidation number The decrease in oxidation
numberExample :
Chemical equation: 2Na + Cl2 2NaCl
Changes in oxidation number Na : 0 +1 // Cl : 0 1Given above are
the changes in oxidation number of Na and Cl, state which element
isoxidized or reduced and which element is the oxidizing or
reducing agent.
Na is ............................. to Na+ : Na is the..
agent
Cl2is .to Cl : Cl2is the . agent
2) What are redox reactions?
.
..
Activity 2
The diagram below shows the oxidation and reduction process that
occurs in a redox reaction.
CuO + C Cu + CO2
By drawing arrows, show and label the oxidation and reduction
processes occurring in theredox reactions below.
ZnO + Mg MgO + Zn 2HI + Cl2 I2 + 2HCl
Reduction
Oxidation
