Haber Process (Animation)

Formation of Ion (Animation)

Question Analysis of Paper 1 Chemistry SPM 2013

Question Analysis of Paper 1 Chemistry SPM 2013 from sweemoi khor

Saranan Kepada Calon Kimia SPM

1. Baca soalan dengan teliti dan fahami kehendak tugasan.  
2. Mesti merancang sebelum menulis jawapan untuk memastikan jawapan adalah betul, tepat dan persis termasuk penggunaan istilah yang tepat.  
3. Jawapan mestilah mengandungi fakta yang tepat dan persis untuk mengelakkan salah faham dan salah tafsir.
4. Mestilah menguasai semua konsep asas kimia terutamanya konsep mol dan Jadual Berkala Unsur.  
5. Selalu membuat latihan berkaitan melukis rajah yang berfungsi dan melabelkan dengan lengkap.
6. Memahami soalan dengan teliti samada jawapan perlu menggunakan formula atau nama bahan kimia. 
7. Tuliskan unit yang betul apabila menyelesaikan masalah pengiraan.
8. Mengingati simbol kimia bagi memudahkan menulis persamaan kimia yang seimbang.
9. Dapat membezakan antara atom, ion dan molekul. 
10. Boleh membezakan antara siri elektrokimia dengan siri kereaktifan. 
11. Menggunakan bahasa, istilah saintifik dan tata bahasa yang betul apabila menjawab soalan.

Petikan dari Kupasan Mutu Jawapan Kimia SPM 2010

Electrolysis of Copper(II) Sulphate

Be analytic when study electrolysis of an aqueous solution.

3 factors affecting product of electrolysis  of an aqueous solution.

1. type of electrode
2. concentration of ion in aqueous solution
3. position of ion in the Electrochemical Series.

What factors are affecting product at anode & cathode during electrolysis of copper(II) sulphate solution?

Position of ion in the Electrochemical series

How do concentration & type of electrode affect product of electrolysis?

Arrangement of Atoms in Bronze

Orderly arrangement of copper atoms.

Presence of tin atoms with different size disrupt orderly arrangement of copper atoms. 
When a force is applied to bronze, the layers of copper atoms are not easily to slide over each other easily. Therefore, bronze is harder than copper.

Atomic Structure & Electron Arrangment

Importance of Chemistry in History

Daniell Cell

An animation from you tube explaining how the reaction occurs in a Daniell Cell

Electrolysis of Molten Lead(II) Bromide

Set-up of apparatus to study electrolysis of molten lead(II) bromide

Diagram shows reactions occurs during electrolysis of molten lead(II) bromide at both electrodes

• Molten lead(II) bromide consists of lead(II) ions and bromide ions.
• During electrolysis of molten lead(II) bromide, bromide ions move to anode and lead(II) ions move to cathode.
• At anode, bromide ions are discharged by releasing electrons to form bromine. Half equation for the reaction is 2Br^-  --> Br₂ + 2e^-
• At cathode, lead(II) ions are discharged by accepting electrons to form lead.  Half equation for the reaction is 

           Pb²⁺ + 2e^- --> Pb

Butter vs Margarine

Master Scientific Skills for Paper 3 Chemistry SPM

The Making of Margarine

What is the effect on the oil used during the making of margarine?

• The liquid oil changes to solid.
• Relative molecular mass of oil molecules increase.

Uses of Palm Oil in Food Production

Reaction between Sodium and Chlorine

The video above shows the reaction between sodium and chlorine.

1. What is the observation?
2. Name the product of the reaction. 
3. Write chemical equation for the reaction between sodium and chlorine.