Berikut adalah beberapa slaid persembahan yang bagus daripada pelajar yang boleh anda download untuk rujukan ataupun nota.
Tingkatan 4
THE PERIODIC TABLE OF ELEMENTS
Group 17
Group 18
ELEMENTS IN A PERIOD
ELECTROCHEMISTRY
TEST FOR CATIONS
Tingkatan 5
Medicine
Friday, October 23, 2009
Monday, October 19, 2009
Strong and weak alkalis
Hari ni ada seorang student tanya sama ada calcium hydroxide masuk kategori strong or weak alkalis.
Lepas cari maklumat, dapatlah disimpulkan bahawa :
Some common strong alkalis include : NaOH, KOH, Ba(OH)2, Ca(OH)2 and Mg(OH)2, LiOH
Weak akali : NH3 solution
Concept of strong and weak base/alkali depend on degree of ionisation of the base/alkali whether involves complete or partial ionisation/dissociation.
Ca(OH)2 and Mg(OH)2 for examples are slightly soluble in water but they are still considered as strong bases/alkalis. It is because what does dissolve is still completely ionised into calcium ion and hydroxide ion. They re still counts as a strong base/alkali because of the complete ionisation ( e.g. Ca(OH)2 ----> Ca2+ + OH- ).
Lepas cari maklumat, dapatlah disimpulkan bahawa :
Some common strong alkalis include : NaOH, KOH, Ba(OH)2, Ca(OH)2 and Mg(OH)2, LiOH
Weak akali : NH3 solution
Concept of strong and weak base/alkali depend on degree of ionisation of the base/alkali whether involves complete or partial ionisation/dissociation.
Ca(OH)2 and Mg(OH)2 for examples are slightly soluble in water but they are still considered as strong bases/alkalis. It is because what does dissolve is still completely ionised into calcium ion and hydroxide ion. They re still counts as a strong base/alkali because of the complete ionisation ( e.g. Ca(OH)2 ----> Ca2+ + OH- ).
Tuesday, October 13, 2009
Latihan topikal Tingkatan 4
Anda boleh download latihan-latihan berikut untuk menguji ataupun mengukuhkan kefahaman dalam topik-topik berkenaan. Selamat mencuba!!!
Practice 2 - Matter
Practice 3 - The structure of atom
Practice 4-Mole
Practice 5 - Empirical formula MgO
Practice 6-Empirical formula CuO
Practice 8-Noble gases
Practice 9-Halogens
Practice 10-Elements in a Period
Practice 11-Periodic Table
Practice 12-Alkali metals
Practice 13-Transition elements
Practice 2 - Matter
Practice 3 - The structure of atom
Practice 4-Mole
Practice 5 - Empirical formula MgO
Practice 6-Empirical formula CuO
Practice 8-Noble gases
Practice 9-Halogens
Practice 10-Elements in a Period
Practice 11-Periodic Table
Practice 12-Alkali metals
Practice 13-Transition elements
Wednesday, October 7, 2009
Kertas 3 - To construct ECS
Berikut adalah beberapa contoh jawapan soalan struktur kertas 3 yang telah cikgu berikan sebagai latihan masa cuti sekolah (Ogos) yang lalu untuk semakan dan rujukan.
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6
Essay-Example 1
Essay-Example 2
Essay-Example 3
Essay-Example 4
Essay-Example 5
Essay-Example 6
Terima kasih atas sumbangan para pelajar yang tugasan mereka telah terpilih sebagai contoh.
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6
Essay-Example 1
Essay-Example 2
Essay-Example 3
Essay-Example 4
Essay-Example 5
Essay-Example 6
Terima kasih atas sumbangan para pelajar yang tugasan mereka telah terpilih sebagai contoh.
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