JawapanBab6 (2)

JAWAPAN

Bahagian B

No. Jawapan
2. (a)
Answer
(b)
Kaedah I : Magnesium dan asid sulfurik

Method I : Magnesium and sulphuric acid

Kaedah II: Magnesium oksida dan asid sulfurik

Method II : Magnesium oxide and sulphuric acid
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(i) Garam X: Kuprum(II) karbonat

Salt X: Copper(II) carbonate

Pepejal Y: Kuprum(II) oksida

Solid Y: Copper(II) oxide

Gas Z: Karbon dioksida

Gas Z: Carbon dioxide

Ujian kimia untuk gas Z:

Chemical test for Gas Z:

1. Alirkan gas ke dalam air kapur

Flow the gas into lime water

2. Air kapur menjadi keruh

Lime water turns cloudy

(ii) Kuprum(II) nitrat // Copper(II) nitrate

Ujian kation (Cu2+):

Test for cation (Cu2+):

1. Tambahkan larutan natrium hidroksida.

Add sodium hydroxide solution

2. Mendakan biru terbentuk.

Blue precipitate formed.

Ujian anion (NO3–):

Test for anion (NO3–):

1. Tambahkan 2 cm3 asid sulfurik cair diikuti dengan 2 cm3 larutan ferum(II) sulfat.

Add 2 cm3 sulphuric acid followed by of 2 cm3 iron(II) sulphate solution.

2. Tambahkan perlahan-lahan asid sulfurik pekat

Add slowly concentrated sulphuric acid

3. Cincin perang terbentuk.

Brown ring is formed.

(iii) CuO + 2HNO3  !: Cu(NO3)2 + H2O

Mole of HNO3 = 1.0 × 50 = 0.05
1000

Daripada persamaan // From the equation,

2 mol HNO3: 1 mol Cu(NO3)2
0.05 mol HNO3: 0.025 mol Cu(NO3)2

Jisim / Mass Cu(NO3)2 = 0.025 × 188 = 4.7 g

Bahagian C

No. Jawapan
3. (a)
(b) Answer

(c) Cuka kerana berasid. Ia boleh meneutralkan sengatan yang beralkali dan dapat mengurangkan
kesakitan.

Vinegar because it is an acid. It can neutralise the alkali sting and can reduce the pain.

(i) MgO / ZnO / CuO
MgSO4 / ZnSO4 / CuSO4

(ii) MgO + H2SO4  !: MgSO4 + H2O

(iii) Tambahkan 2 cm3 larutan barium klorida. Mendakan putih terhasil.

Add 2 cm3 of barium chloride solution. White precipitate produced.

Bahan / Material : Air suling / Distilled water

Radas: Bikar 50 cm3, rod kaca, corong turas, kertas turas, mangkuk penyejat, penunu Bunsen,

Apparatus : 50 cm3 beaker, glass rod, filter funnel, filter paper, evaporating dish, Bunsen burner

Prosedur / Procedure:
1. Masukkan campuran garam ke dalam bikar. Tuangkan air suling dan kacau.

Put the salt mixture in a beaker. Add in distilled water and stir.

2. Turaskan dan keringkan pepejal X karbonat dengan kertas turas.

Filter and dry the solid X carbonate with a filter paper.

3. Masukkan hasil turasan ke dalam mangkuk penyejat dan panaskan sehingga tepu.

Put the filtrate in an evaporating dish heat until saturated.

4. Sejukkan larutan.

Cool the solution.

5. Turaskan garam Y nitrat. Keringkan dengan kertas turas.

Filter salt Y nitrate. Dry with a filter paper.

Pemerhatian: Garam X karbonat tidak larut. // Garam Y nitrat larut.

Observation: X carbonate salt is insoluble. // X nitrate salt is soluble.
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