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MODULE • Chemistry Form 4

6 The diagram below shows list of chemical substances.
Rajah di bawah menunjukkan senarai bahan-bahan kimia.
Hydrochloric acid, 1.0 mol dm –3 Barium chloride solution, 1.0 mol dm –3
Larutan asid hidroklorik, 1.0 mol dm –3 Larutan barium klorida, 1.0 mol dm –3
Iron(II) sulphate solution, 1.0 mol dm –3 Solid copper(II) oxide Solid calcium carbonate
Larutan ferum(II) sulfat, 1.0 mol dm –3 Pepejal kuprum(II) oksida Pepejal kalsium karbonat

(a) (i) Choose two solutions that can be used to prepare insoluble salts.
Pilih dua larutan yang digunakan untuk menyediakan garam tak terlarutkan.
Barium chloride and iron(II) sulpahate
(ii) What is the type of reaction for the preparation of the salt in (a)(i)?
Apakah jenis tindak balas bagi penyediaan garam di (a)(i)?
Double decomposition reaction

(iii) Write the ionic equation for the production of the salt in (a)(i).
Tulis persamaan ion bagi penghasilan garam di (a)(i).
Ba + SO BaSO
2–
2+
4 4
(iv) Describe how to collect the pure salt produced.
Huraikan bagaimana anda mendapatkan pepejal garam tulen yang terhasil.
Filter the mixture and rinse with distilled water

(b) State the observations when sodium hydroxide solution is added in small amount until in excess into iron(II)
sulphate solution./ Nyatakan pemerhatian anda apabila larutan natrium hidroksida ditambah sedikit sehingga berlebihan kepada
larutan ferum(II) sulfat.
Green precipitate formed, insoluble in excess of sodium hydroxide solution

(c) (i) Choose two chemical substances that can react to produce carbon dioxide gas.
Pilih dua bahan yang boleh bertindak balas untuk menghasilkan gas karbon dioksida.
Calcium carbonate and hydrochloric acid
(ii) Write a balanced chemical equation for the reaction in (c)(i).
Tulis persamaan kimia seimbang bagi tindak balas di (c)(i).
CaCO + 2HCl CaCl + H O + CO
3 2 2 2

7 You are given zinc chloride crystals. Describe how you would conduct a chemical test in the laboratory to identify the ions
presence ions in zinc chloride crystals./ Anda diberi hablur zink klorida. Huraikan bagaimana anda boleh menjalankan ujian kimia di
dalam makmal untuk mengenal pasti ion-ion yang hadir dalam hablur zink klorida.
1
– Dissolve spatula zinc chloride crystals in 10 cm of distilled water.
3
2
1
Larutkan spatula hablur zink klorida di dalam 10 cm 3 air suling .
2
– The solution is poured in three test tubes./ Larutan tersebut dituang ke dalam tiga tabung uji.
– Add a few drops sodium hydroxide solution are added to zinc chloride solution until excess. A white
precipitate soluble in excess of sodium hydroxide solution.
Tambahkan beberapa titik larutan natrium hidroksida ke dalam larutan zink klorida sehingga berlebihan .
Mendakan putih larut dalam larutan natrium hidroksida berlebihan.
– Add a few drops ammonia solution are added to another zinc chloride solution until excess. A white
precipitate soluble in excess of ammonia solution. Ions present are zinc ions .
Tambahkan beberapa titik larutan ammonia ke dalam larutan zink klorida yang lain sehingga berlebihan .
Mendakan putih larut dalam larutan ammonia berlebihan. Ion yang hadir adalah ion zink .
– About 2 cm of dilute nitric acid is added to 2 cm solution of chloride ions followed by 2 cm of silver nitrate
3
3
3
solution. White precipitate formed. Ions present are chloride ions.
2 cm 3 asid nitrik cair ditambahkan kepada 2 cm larutan ion klorida diikuti dengan 2 cm larutan argentum nitrat .
3
3
Mendakan putih terbentuk. Ion yang hadir adalah ion klorida.
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