Saturday, January 24, 2009


A. Memberi jawapan yang ringkas dan tepat.
• Jangan mengulangi ayat dalam soalan.
• Terus menulis jawapan yang dikehendaki.

Example :
Which of the following element can form base oxide?

Answer :
Wrong = From the following elements, the element that can form a base oxode is sodium / Natrium.
Correct = Sodium / Natrium. (Terus tulis nama unsur itu)

1. Molten lead(II) bromide can conduct electricity, explain why?

B. Memberi jawapan mengikut kehendak soalan.
• Jangan memberi jawapan yang tidak berkaitan dengan kehendak soalan.
• Baca soalan dengan teliti dan gariskan/bulatkan maklumat yang penting.

Example :
Write a chemical formula for the product when magnesium react with oxygen

Answer :
Wrong = 2Mg + O2 -----------> 2MgO (equation)
Correct = MgO (the chemical formula for magnesium oxide)

Example :
What can you observe when calcium carbonate added into dilute sulphuric acid.

Answer :
Wrong = Carbon dioxide gas release (the gas name)
Correct = Gas bubble released
Correct = Effervesce happened.

Example :
Write an ionic equation for the reaction between dilute hydrochloric acid and sodium hydroxide solution

Answer :
Wrong = HCl + NaOH --------> NaCl + H2O
Correct = H+ + OH- --------> H2O

1. State a chemicals property for the element in group one in Periodic Table of Elements
2. Write the number of charge for the magnesium ion
3. List all the ionic formula for the ions that consist in aqueous copper(II) sulphate.
4. In the electrolysis of aqueous sodium hydroxide, what is the product produce at anode?

C. Menggunakan istilah -istilah yang betul.
• Jangan menggunakan istilah-istilah yang salah.
• Harus menggunakan istilah yang betul.

Example :
Wrong (Correct)
1 The attraction force between molecules
low/small/high (Weak/Strong)
Sodium has one electron valens (Sodium atom)
3 Argon atom has
stable arrangement / complete electron arrangement / 8 stable electron.
Stable electron arrangement /electron arrangement as noble gas / 8 electron at the outermost shell / the electron at the outermost shell are full)
4 The colour of the solution change from blue to clear. (Colourless / decolourise).
5 Ions in the electrolyte can
move. (free / free moving).
6 The rate of reaction
fast/slow. (High/low).
7 Copper
moleculs. (Atoms)
8 Copper
atoms attracted to cathode. (Ions)



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    pls link me.

  2. owh..

    thanx 4 de information..

    very useful:)