Why carbon-12 was chosen as a reference standard for relative atomic mass and relative molecular mass?

Mengapakah karbon-12 telah dipilih sebagai rujukan piawai untuk jisim atom relatif dan jisim molekul relatif?

Which of the following particles equal to 1 mole?

Antara zarah yang berikut, yang manakah bersamaan

dengan 1 mol?

Which of the following gases contains 0.4 mol of atoms at room temperature and pressure?

[1 mol of gas occupies the volume of 24 dm³ at room temperature and pressure]

Antara gas berikut, yang manakah mengandungi 0.4 mol atom pada suhu dan tekanan bilik?

[1 mol gas menepati isipadu sebanyak 24 dm³ pada suhu dan tekanan bilik]

Which of the following gases exists as a monoatom?

Which characteristics is correct about elements in Group 1 in the Periodic Table as going down the group?

Ciri manakah yang betul tentang unsur-unsur dalam Kumpulan 1 dalam Jadual Berkala Unsur apabila menuruni kumpulan?

Which of the following substances can act as an electrolyte?

Which of the following substances is a monoprotic acid?

Which of the following salts can be prepared by the double decomposition method?

Which of the following statements is true for both methanol and propanol?

What is the general formula of alkenes?

Diagram shows a flower that has a pleasant fragrance.

What is the name of the substance that gives the pleasant fragrance?

Diagram shows the apparatus set-up to study the reactivity of a metal with oxygen. The colour of the product formed is yellow when hot and white when cold.

What is the metal?

Which of the following pairs of isotope and its use is correct?

The relative formula mass of Y₃(PO₄)₂ is 310.

Find the relative atomic mass of element Y.

[Relative atomic mass : O = 16, P = 31]

Diagram 6 shows the electron arrangement of atom T.

Atoms T and U are placed in the same period of in the Periodic Table of Element. The atomic radius of atom U is larger than atom T. What is the probable electron arrangement of atom U?

Iron and copper are transition metals. Which of the following is the special characteristic of the metals?

Diagram shows the electron arrangement of a compound formed between atom P and Q. Which of the following statements is true about the compound?

In the extraction of aluminium by electrolysing molten aluminium oxide, cryolite is added to the mixture to

The following equation represents a reaction between zinc metal and sulphuric acid.

Zn + H₂SO₄ → salt + H₂

What is the name of the salt and its solubility in water?

Calculate the percentage of nitrogen in ammonium nitrate, NH₄NO_{3 .}

Given that the relative atomic mass of H = 1, N = 14, O = 16

A method to control the rusting of underground iron pipelines is through sacrificial protection. Which of the following is the sacrificial metal?

Diagram above shows the arrangement of atoms in brass. Which of the following could be atoms X and Y?

Which industrial process use iron as a catalyst?