Saturated fat molecule or unsaturated fat molecule

Molecule A

Molecule B

Based on the structure for both fat molecules,

1. Which molecule is a unsaturated fat molecule? Why?
2. Which homologous series does molecule A belong to? Why?
3. State two difference of both molecules.
4. Which molecule can undergo catalytic hydrogenation? State the condition of the reaction.

Compare Vulcanised Rubber and Unvulcanised Rubber

This is one of the question in SPM 2006 Paper 3. The following photo might help to give you a hint to write the experiment plan.

For suggested answer, please click here.

Pahang Chemistry Module - Oxidation and Reduction

I found this document from Scribd posted by khayranizam.  It is useful for revision as the notes are compiled in the form of mind map.

More module on
Rate of reaction
Thermochemistry
Chemical Bonds
Manufacture Substance in Industry

Test for iron(II) ion and iron(III) ion

In my today lesson with form 5 students, I discussed the conversion of Fe²⁺ ion to Fe³⁺ ion by using oxidizing agents and conversion of Fe³⁺ to Fe²⁺ ion by using reducing agents.   To my shock, my students were hardly name any chemicals used to test the presence of Fe²⁺ ion and Fe³⁺ ion. 

Some students complained that is hard to remember the facts. Some would said that they didn't carry out the test when they were in form 4. I'm wondering, any students instead of blaming others, being proactive thinking ways to remember the facts? So far, some of ex-students creating stories(huh? story on chemistry facts?), songs, pneumonics, colourful notes with diagrams/mindmap to remember this. They ended up enjoying the fun of learning.

 

Relationship Between Homologous Series

Name the reaction P, Q, R, S, T and U.

Minggu Sains & Teknologi 2010

Suggested Topic for Pamphlet/Poster/PowerPoint Design
1. Chemical related careers
2. Uses of isotope in daily life
3. Contribution of scientist towards chemistry
4. Advantages & Disadvantages of various voltaic cell
5. Importance of recycling and systematic disposal of used batteries
6. Application of neutralisation in daily life
7. Uses of sulphuric acid
8. Uses of ammonia
9. Alloy
10. Polymers
11. Glass
12. Ceramics
13. Methane and its effects on everyday life
14. Isomerism
15. Homologous series
16. Uses of alcohols; misuse and abuse of alcohols
17. Uses of carboxylic acids
18. Esters; natural sources, uses
19. Effects of Fats on health
20. Uses of palm oil in food production
21. Food additives & Food label
22. Modern Medicine and its side effect
23. Traditional Medicine

Other topics must get approval from your chemistry teacher first.

Your pamphlet/poster/powerpoint desgin must be informative, with pictures, extra information from other resources and creative!

Public Speaking
Theme: Application of chemistry in daily life.
Time alocated: 5 minutes
Topic: Choose a topic related to the theme and explain with examples/latest information/technology. Perhaps elaborate more its benefit/misuses/effects to human being/environment.

Palm Oil Based Oleochemicals

This is a promotional video from Malaysia Palm Oil Councils. The video describes much in details the benefit of palm oil with many examples of oleochemicals derived from palm oil.

Why is Platinum So Expensive?

Platinum, Pt is one of the transitition elements. It is very expensive. Watch this video to find out the reason.

From www.youtube.com

What are the special characteristics of platinum?

Definition of Redox Reaction

From chem2U

One way of remembering the defnition is by using mneumonics. The following is one example: OIL-RIG

Other example of mneumonics:

1. 
   
   "GEROA", "LEORA"—Gain Electron Reduction Oxidizing Agent, Lose Electron Oxidation Reducing Agent

The Elements Song Animated

SPM Corner - Alkenes

S P M Corner Alkenes from sweemoi khor

Isomerism

Isomerism from sweemoi khor

To view a list of isomers for all alkanes, please click here.

Compare Hexane and Hexene

Recently my students just carried out experiments to compare hexane(C₆H₁₄) and (C₆H₁₄) in terms of sootiness of flame during combustion. Filter papers are used to collect soot formed during the experiments.

It is obvious from the filter papers, hex-1-ene produces more soot than hexane during combustion. It is due to percentage of carbon content.   Though both hex-1-ene and hexane have 6 carbon atoms per molecule, but hex-1-ene has higher percentage of carbon content than hexane.

Paper 3 SPM 2005 - Planning an Experiment

In paper 3 Chemistry SPM, a student is asked to plan an experiment based on the situation given. I have given this question to my students as an exercise. Most of the time, they would give me an wrong experiment plan. They planned experiment exactly the same as the experiment they carried out to investigate how the concentration of sodium thiosulphate affect its rate of reaction with sulphuric acid. 

Samples of answer please click here.

Aspirin

Aspirin is one example of analgesic which is normally used in treatment for headache and fever. However it is not suitable for kids as it can cause internal bleeding in the stomach.