Page 162 - Nilam_Publication_module_Chemistry_Form.pdf

MODULE • Chemistry Form 4

– 2 cm of dilute sulphuric acid is added to 2 cm solution of Observation: / Pemerhatian:
3
3
nitrate ions followed by 2 cm of iron(II) sulphate solution. A brown ring is formed between two layers.
3
2 cm larutan ion nitrat ditambah kepada 2 cm asid sulfurik cair Cincin perang terbentuk di antara dua lapisan.
3
3
3
diikuti dengan 2 cm larutan ferum(II) sulfat. Inference: / Inferens:
– The mixture is shaken.
Nitrate ion, NO – Campuran digoncang. Nitrate ion present.
3 Ion nitrat hadir.
Ion nitrat, NO – – The test tube is slanted and held with a test tube holder.
3
Tabung uji dicondongkan dan diapit dengan pemegang tabung uji.
– A few drops of concentrated H SO acid is dropped along the
4
2
wall of the test tube and is held upright.
Beberapa titis H SO pekat dititiskan melalui dinding tabung uji dan
4
2
ditegakkan.
EXERCISE / LATIHAN

1 (a) Substance A is white in colour. When A is strongly heated, a brown gas, B and gas C are released. These gases lighted
a glowing wooden splinter. Residue D which is yellow in colour when hot and white when cold is formed.
Bahan A berwarna putih. Apabila A dipanaskan dengan kuat, gas berwarna perang B dan gas C dibebaskan. Gas C menyalakan kayu
uji berbara. Baki D yang berwarna kuning apabila sejuk dan putih apabila sejuk terbentuk.
(i) Name substances A, B, C and D.
Namakan bahan A, B, C dan D.

A: Zinc nitrate B: Nitrogen dioxide C: Oxygen D: Zinc oxide
(ii) Write the chemical equation when substance A is heated.
Tuliskan persamaan kimia apabila bahan A dipanaskan.
2Zn(NO ) 2ZnO + 4NO + O 2
3 2
2
(b) Write the chemical equation when substance E is heated.
Larutan tanpa warna E memberi keputusan berikut apabila dijalankan beberapa siri ujian:
S1 – Add sodium hydroxide solution, a white precipitate is formed. The precipitate is soluble in excess sodium
hydroxide solution.
L1 – Apabila ditambah dengan larutan natrium hidroksida, mendakan putih terbentuk. Mendakan ini larut apabila ditambah natrium
hidroksida berlebihan.
S2 – Add ammonia solution, a white precipitate is formed. The precipitate is insoluble in excess ammonia solution.
L2 – Apabila ditambah larutan ammonia, mendakan putih terbentuk dan mendakan ini tidak larut dalam larutan ammonia
berlebihan.
S3 – Add potassium iodide solution, a yellow precipitate F, is formed.
L3 – Apabila ditambah dengan larutan kalium iodida, mendakan kuning F terbentuk.

(i) What are the possible cations present in substance E as a result of S1 test?
Apakah kation-kation yang mungkin hadir dalam bahan E hasil ujian L1?
2+
Pb , Al and Zn 2+
3+
(ii) What are the possible cations present in solution E as a result from S1 and S2 tests?
Apakah kation yang mungkin hadir dalam larutan E hasil ujian L1 dan L2?
Pb and Al 3+
2+
(iii) What is the ion present in E after S3 test has been done? Write an ionic equation for the formation of substance
F.
Apakah ion yang disahkan hadir dalam E setelah dilakukan ujian L3? Tulis persamaan ion bagi pembentukan bahan F.
Pb
Ion present /Ion hadir: 2+
–
2+
Ionic equation/Persamaan ion: Pb + 2I PbI 2

160
Nilam Publication Sdn. Bhd.

07-Chem F4 (3p).indd 160 12/9/2011 5:55:24 PM