SPM CHEMISTRY 2019 4541/2 Q7

Question

7.(a) The extraction of iodine from seaweed by using. acidified hydrogen peroxide solution is shown in the following ionic equation.
Pengekstrakan iodin daripada rumpai laut dengan menggunakan larutan hidrogen peroksida berasid ditunjukkan dalam persamaan ion yang berikut .
2H- + H2O2 + 2H+ -> I2 + 2H2O
Based on the above ionic equation ,
-state the change in the oxidation number of iodine.
-write the half equation for the oxidation reaction.
-state the oxidising agent and reducing agent.
Berdasarkan persamaan ion di atas ,
-nyatakan perubahan nombor pengoksidaan iodin.
-tulis setengah persamaan bagi tindak balas pengoksidaan.
-nayatakan agen pengoksidaan dan agen penurunan.
(b)Diagram 6 shows the conversation between Lili and her mother in a grocery shop.
Rajah 6 menujukkan perbualan antara Lili dengan ibunya di sebuah kedai runcit.
Afood can is made from iron that is coated with tin .
Why food in a dented can is not safe to be consumed?Explain .
Tin makanan deperbuat daripada ferum yang disaluti dengan stanum.
Mengapakah makanan dalam tin yang kemik tidak selamat dimakan ? Terangkan.
(c)An experiment is carried out to study the redox reactions by the transfer of electrons at a distance.The results of the experiment are shown in Table 3.
Satu eksperimen dijalankan untuk mengkaji tindak balas redoks melalui pemindahan elektron pada suatu jarak .Keputusan eksperimen ditunjukkan dalam Jadual 3.
Based on the observation in Table 3,
(i)suggest solutions X and Y
(ii)for each set of experiment ,
-state the substance that is oxidised
-write the half equation of the oxidation reaction
-state the oxidising and reducing agents.
Berdasarkan pemerhatian pada Jadual 3,
(i)cadangkan larutan X dan larutan Y
(ii)bagi setiap set eksperimen ,
-nyatakan bahan yang dioksidakan
-tulis. setengah persamaan bagi tindak balas pengoksidaan
-nyatakan agen pengoksidaan dan agen penurunan

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    2021-03-27T15:00:43+08:00

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