Which of the following chemical formulae is correct?

Antara formula kimia berikut, yang manakah betul?

Table below shows the percentage by mass of each element in a compound and their relative atomic masses.

Jadual di bawah menunjukkan peratusan mengikut jisim bagi setiap unsur dalam satu sebatian dan juga jisim atom relatif masing-masing.

What is the empirical formula of the compound?

Apakah formula empirik untuk sebatian tersebut?

1.04 g of metal M react with 0.48 g of oxygen to form M oxide. Determine the empirical formula of M oxide.

1.04 g logam M bertindak balas dengan 0.48 g oksigen untuk membentuk oksida M. Tentukan formula empirik oksida M.

[ relative atomic mass : O = 16 ; M = 52 ]

Diagram below shows the set-up of apparatus to determine the empirical formula of magnesium oxide.

Rajah di bawah menunjukkan radas untuk menentukan formula empirik bagi magnesium oksida.

Which of the following statement is true for the lifting and closing of the lid quickly and occasionally during heating?

Antara pernyataan berikut yang manakah benar bagi penutup diangkat dan ditutup dengan cepat sekali sekala semasa pemanasan?

The following equation represents a reaction.

Persamaan berikut mewakili satu tindak balas.

3H₂ (g) + N₂ (g) → 2NH₃ (g)

What is the relative molecular mass of the product?

Apakah jisim molekul relatif bagi hasil tersebut?

[ Relative atomic mass : H=1 ; N=14 ]

[Jisim atom relatif : H=1 ; N=14 ]

The following equation represents the combustion of methane.

Persamaan berikut mewakili pembakaran metana.

CH₄ + 2O₂ → CO₂ + 2H₂O

Calculate the volume of carbon dioxide formed at standard temperature and pressure if 3.2 g of methane is used.

Kira isipadu karbon dioksida yang terhasil pada suhu dan tekanan piawai jika 3.2 g metana digunakan.

(Relative atomic mass / Jisim atom relatif : H=1 , C=12 , O=16)

(Molar volume of gas at standard temperature and pressure / Isipadu molar gas pada suhu dan tekanan piawai = 22.4 dm³ mol^-1)

Sodium hydrogen carbonate decompose on heating according to the following equation :

Natrium hidrogen karbonat terurai oleh haba mengikut persamaan berikut :

2NaHCO₃ (s) → Na₂CO₃ (s) + CO₂ (g) + H₂O (l)

If 16.8 g of sodium hydrogen carbonate is used, what is the mass of sodium carbonate produced?

Jika 16.8 g natrium hidrogen karbonat digunakan, berapakah jisim natrium karbonat yang terhasil?

[Relative atomic mass / Jisim atom relatif : H = 1 ; C = 12 ; O = 16 ; Na = 23]

The following equation shows the decomposition reaction of copper(ll) carbonate when heated at room temperature and pressure.

Persamaan berikut menunjukkan tindak balas penguraian kuprum(II) karbonat apabila dipanaskan pada suhu dan tekanan bilik.

CuCO₃ --> CuO + CO₂

Which of the following is not true when 1 mol of copper(lI) carbonate is decomposed?

[Relative atomic mass: C= 12, O= 16, Cu= 64 and 1 mol of gas occupies the volume of 24 dm³ at room temperature and pressure].

Antara yang berikut, yang manakah tidak benar apabila 1mol kuprum(II) karbonat terurai?

[Jisim atom relatif: C= 12, O= 16, Cu= 64 and 1 mol gas menempati isipadu sebanyak 24 dm³ pada suhu dan tekanan bilik]

The equation is represents the decomposition of hydrogen peroxide.

Persamaan berikut mewakili tindak balas penguraian hidrogen perosida.

2H₂O₂ → 2H₂O + O₂

How many moles of hydrogen peroxide H₂O₂ is required to produce 480 cm³ of oxygen gas at room condition?

[Molar volume of gas = 24 dm³ mol^-1 at room condition]

Berapakah bilangan mol hidrogen peroksida, H₂O₂ yang diperlukan untuk menghasilkan 480 cm³ gas oksigen pada keadaan bilik?

[Isipadu molar gas = 24 dm³ mol^-1pada keadaan bilik]