Modul 1 Chemistry

Assalamu'alaikum murid-murid,

Sekarang cikgu nak ajar Chemistry plak. Okay, sedikit tips untuk subjek ni.

• Master the topics that contains the basic concepts of chemistry 

1. The Structure of the Atom
2. Chemical Formula and Equations
3. Periodic Table
4. Chemical bond

• Memorize all the colour of the compound in chapter 8, which is salt.
• Know how to differentiate between ion, molecule, metal,  and compound.

Okay, sekarang kita belajar modul 1. Untuk modul 1 consist of 4 chapter which is:

1. The Structure of the Atom
2. Chemical Formula and Equations
3. Periodic Table
4. Chemical bond

Cikgu nak kamu semua faham chapter ni betul2. Sebab kalau dah modul 1 takleh buat kemungkinan besar modul yang seterusnya pon agak susah nak buat jugak.

Let's start !

DEFINITION :

Empirical formula : Chemical formula shows simplest ratio of the number of atom for each element in a compound.

Molecular formula : Chemical formula shows actual number of atom in a compound.

REMEMBER !

Perkataan yang cikgu BOLD kan tu WAJIB ada, sebab itu adalah KEYPOINT dia. So, jgn lupa.

This question is very very famous on SPM. Please understand it.

Soalan selalu tanya group 1, group 7 dan group 8.

Group 8 adalah unreactive. Group 8 cannot react with another element because of the element in group 8 is stable octet and stable duplet electron arrangement. 

Group 1 plak very reactive with water. Tapi boleh jugak react dengan group 17, dan oxygen. Tapi selalunya soalan tanya reactivity group 1 with water. The reactivity increases down the group. When group 1 react with water it will produce alkali solution and hydrogen gas. So, bile nak buat chemical equation make sure your reactant are element of group 1(Na, Li, K) and water, then your product are alkali (NaOH, LiOH, KOH) and hydrogen gas. And, don't forget to balance your equation. Kalau dalam Paper 3 biasanya soalan akan tanya reactivity with water and oxygen. So, make sure you know how to conduct this experiment.

Nama lain bagi group 17 ialah Halogen. The reactivity increases down the group. Group 17 hadir sebagai gas. This group its not metal it is a gas. That's why it is written like this (Cl₂, Br₂, F₂, I₂). Please memorize all the physical properties of this group. This is also the famous question.

Good luck alls.

xoxo. publish !

Bye. Assalamu'alaikum.