7

The flow chart in the diagram shows a series of chemical changes of solid Q .Carta alir dalam rajah ini menunjukkan siri perubahan kimia pepejal Q

(a) Draw a labelled diagram of the set-up of apparatus for the chemical reaction of converting substance Q to solid U and gas R. In your diagram show how gas R is tested.

Lukis susunan radas berlabel untuk penukaran bahan Q kepada pepejal U dan gas R. Dalam rajah anda tunjukkan bagaimana gas R diuji.

[4 marks]

(b) Solution Z and V are the products from reaction in flow chart. Larutan Z dan V merupakan hasil tindak balas dalam carta alir.

(i) Name the possible metal cation in solution Z . Namakan kation logam yang mungkin dalam larutan Z [1 marks]

(ii) Describe the confirmatory test for a cation mention in b(i) Terangkan ujian pengesahan bagi kation yang dinamakan di b(i).

[2 marks]

(c) Describe how to obtain crystal salt V from their solution V Terangkan bagaimana hablur garam V dipoleh daripada larutan V.

[4 marks]

(d) Metal M is more electropositive than the metal in solution V. When metal M is added into solution V , chemical reaction occured. Name the metal M and give an observations for the reaction that produces solution W and solid X.

Logam M adalah lebih elektropositif daripada logam yang membentukkan larutan V. Apabila logam M ditambahkan ke dalam larutan V, suatu tindak balas berlaku. Namakan logam M dan berikan satu pemerhatian untuk tindak balas berlaku yang menghasilkan larutan W dan pepejal X.

[2 marks]

Solution ZLarutan Z

+ Dilute nitric acid/+ asid nitric cair

Solution W + solid X

+ metal M/+ logam M

Solution V + Gas RLarutan V + Gas R

Solid U + Gas RPepejal U + gas R

Solid U is blackPepejal U berwarna

hitam

+ Asid sulfuric cair

+ Dilute sulphuric acidHeated / dipanaskan

Substance QBahan Q

(e) The chemicals supplied are Zinc oxide Sodium carbonate solution Dilute nitric acid

Describe briefly how you can prepare a sample of dry zinc carbonate in the laboratory. Include in your answer all chemical equations involved.

Bahan kimia yang dibekalkan ialah Zink oksida Larutan natrium karbonat Asid nitrik cair

Huraikan secara ringkas bagaimana anda menyediakan satu contoh garam kering zink karbonat dalam makmal. Sertakan dalam jawapan anda persamaan kimia yang terlibat.

[7 marks]

TRIAL SELANGOR 2007

9 (a) Three colourless aqueous solutions in separate reagent bottles, have had their labels removed. You are told that the three solutions are nitric acid, sodium chloride solution and sodium sulphate solution. Describe the chemical tests to identify each aqueous solution without using any indicators. Include ionic equations in your answer.

Tiga larutan akueus yang tidak berwarna masing-masing di dalam botol reagen telah tertanggal labelnya. Anda diberitahu bahawa tiga larutan itu ialah asid nitrik, larutan natrium klorida

dan larutan natrium sulfat.

Bagaimanakah anda menjalankan ujian kimia untuk mengesahkan setiap larutan akueus tersebut tanpa menggunakan penunjuk. Tuliskan persamaan ion dalam jawapan anda.

[10 mark]

(b) You are provided with nitric acid and all the necessary apparatus and chemicals.Describe an experiment to prepare a sample of dry lead (II) chloride starting from nitric acid.Include chemical equations in your answer.

Anda dibekalkan dengan asid nitrik dan semua radas dan bahan yang diperlukan.Huraikan satu eksperimen untuk menyediakan garam plumbum (II) klorida yang kering bermula daripada asid nitrik.Dalam jawapan sertakan persamaan kimia. [10 marks]

TRIAL KEDAH 2007

9 (a) Diagram 9 shows the reactions involved in the preparation of soluble salts.

DIAGRAM/ RAJAH 9

(i) Sodium, potassium and ammonium salts can be prepared using reaction between acid and alkali. State the reaction X, Y and Z.Garam natrium, kalium dan ammonium dapat disediakan melalui tindak balas antara asid dan alkali. Nyatakan tindak balas X, Y dan Z.

[3 marks]

(ii) By choosing one of the reactions in (a) (i), suggest example of reactants used and products formed. Write the chemical equation for the reaction based on your suggestion.Dengan memilih satu daripada tindak balas dalam (a) (i), cadangkan contoh bahan- bahan tindak balas yang digunakan dan hasil-hasil tindak balas yang terbentuk.Tuliskan persamaan kimia bagi tindak balas berdasarkan cadangan anda itu.

[3 marks]

(b)

Answer the following questions based on the above statement.Jawab soalan- soalan berikut berdasarkan pernyataan di atas.

(i) Describe a laboratory experiment to prepare a dry magnesium sulphate. In your description, include the chemical equation involved. Huraikan satu eksperimen makmal untuk menyediakan garam magnesium sulfat yang kering. Dalam huraian anda sertakan persamaan kimia bagi tindak balas yang terlibat.

[10 marks](ii) Describe a simple chemical test of how you could differentiate between magnesium

sulphate and magnesium nitrate.Huraikan satu ujian kimia ringkas bagaimana anda membezakan antara larutan magnesium sulfat dan magnesium nitrat.

[4 marks]

TRIAL SBP 2007

Reaction / Tindak balas Z

Reaction / Tindak balas Y

Reaction / Tindak balas X

Asid + alkali salt + waterAsid + alkali garam + air

Other salts /Garam lain

Sodium salts / Garam natrium

Potassium salts /Garam kalium

Ammonium salt /Garam ammonium

Soluble salts / Garam larut

Magnesium sulphate is a soluble salt. Magnesium sulfat adalah garam terlarutkan.

1. You are required to prepare dry zinc sulphate salt. The chemicals supplied are

zinc nitrate solution dilute sulphuric acid sodium carbonate solution

Describe a laboratory experiment to prepare the salt. In your description, include chemical equations involved.

[11 marks]]TRIAL JOHOR 2008

9 (a) The following equation represents the reaction between silver nitrate solution and hydrochloric acid. AgNO3 (aq) + HCl (aq) AgCl (s) + HNO3 (aq)

[2 marks] [2 markah]

(b) Diagram 9 shows an incomplete flow chart of cation and anion tests for salt Y.Rajah 9 menunjukkan carta alir yang tidak lengkap bagi ujian kation dan anion bagi suatu garam Y .

Use the reagents listed below, describe the cation and anion tests to confirm that salt Y contains Pb2+ ions and NO3

- ions. Include your observations of the tests.Dengan menggunakan reagen-reagen yang disenaraikan di bawah, huraikan ujian kation dan anion untuk mengesahkan bahawa garam Y mengandungi ion Pb2+ and NO3

-. Sertakan pemerhatian yang diperolehi dalam ujian.

[8 marks]

(c) You are required to prepare zinc sulphate salt. The chemicals supplied are as follows:

REAGENTS /REAGEN

Sodium hydroxide solution, ammonia solution, acidified iron (II) sulphate solution, concentrated sulphuric acid, dilute sulphuric acid and potassium iodide solution

Larutan natrium hidroksida, larutan ammonia, larutan ferum(II) sulfat berasid, asid sulfurik pekat, asid sulfurik cair dan larutan kalium iodida.

Cation TestUjian kation

Anion TestUjian anion

Salt YGaram Y

Zn2+ NO3-

(i) Name the type of reaction. Namakan jenis tindak balas.

(ii) Write the ionic equation for the reaction. Tuliskan persamaan ion bagi tindak balas tersebut

- zinc oxide powder - 1.0 mol dm-3 of sulphuric acidDescribe a laboratory experiment to prepare the salt. In your description, include the chemical equations involved.

Anda dikehendaki menyediakan garam zink sulfat.Bahan-bahan kimia yang berikut dibekalkan: - serbuk zink oksida - Asid sulfurik 1.0 mol dm-3

Huraikan satu eksperimen makmal untuk menyediakan garam tersebut.Dalam huraian anda, sertakan persamaan-persamaan kimia yang terlibat.

[10 marks] [10markah]