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Wednesday, April 3, 2013

F5- Chemistry Chapter2 -Reactions of propene

The molecular formula or structural formula of the product for every reaction of propene.

The following is the short notes I've made. Sorry for not updating for so long >.< my laptop was spoilt uhh. If you have any questions, please comment!! We could discuss together :)

Thank you for viewing and I hope you enjoy.

Friday, March 29, 2013

[Chemistry] F5C2 Carbon Compounds - Short Notes of Hydrocarbons Part 1 (Alkane)

Very sorry for not updating iGotcha since 2 weeks ago.. And today, we are going to talk about Carbon Compounds.

In this chapter, our main character is CARBON!!! Based on my Chemistry teacher, this chapter is more to memorize and not calculation. So, it's better to memorize from now on.

1. Hydrocarbon is an organic compound consists of hydrogen and carbon element ONLY!!!

2. Source of hydrocarbon

- Petroleum (refining / fractional distillation)
- Natural gas
- Coal (Destructive distillation)
--> coal tar, ammonia, coal gas, coke

3. Hydrocarbon

Saturated hydrocarbon = alkane
Unsaturated hydrocarbon = alkene

* How to differentiate the difference between saturated and unsaturated hydrocarbon? Use this tip below.

Satu in Malay means 1, that means this type of hydrocarbon consists of carbon-carbon single(1) bond.

Meanwhile, unsatu means not 1, that means this type of hydrocarbon consists of at least 1 carbon-carbon double(3) bond or triple(3) bond.

4. Initial name (IMPORTANT, must MEMORIZE!!!)

Alkanes

General Formula :

where n starts from 1,2,3 and so on.
Physical properties :

- less dense than water

- not soluble in water but soluble in organic solvent

- low melting and boiling point (weak van der Waals forces of attraction) but increase gradually going down alkane series

- 1st member to 4th member is gas

- poor conductor of electricity

Chemical reaction

- combustion, product is CO2 and H2O, but remember to balance the equation.

- substitution, in the presence of SUNLIGHT / ULTRAVIOLET RAY

That's all for alkanes~

Friday, March 1, 2013

[Physics] Monthly Test 1

This time my monthly test are not based on the full format because of not enough time for candidates to answer. And, I hope this can help you all in facing your coming exam (March). And another thing is my paper is quite messy since teacher gave us a lot of explanation, I hope you all can understand =)

Paper 1: