1.What type of compounds is mainly present in the candle wax?
2.Why does the candle burn with yellow flame?
3. Why is it dangerous to add cold water to a tray containing molten wax at high temperature?
4. Cracking of naphtha gives alkane A (relative atomic mass 58) , alkane B(relative molecular mass 42) and other products.
a)Suggest a test to distinguish between A and B
b)Deduce the molecular formular A.
5. Give 2 reasons why many campers use butane burners instead of wood or charcoal.

1.What type of compounds is mainly present in the candle wax?
Hydrocarbon Compounds

2.Why does the candle burn with yellow flame?
Candle wax has a high number of Carbon content

3. Why is it dangerous to add cold water to a tray containing molten wax at high temperature?
It is because water will evaporate and form steam, steam may cause severe burn.

5. Give 2 reasons why many campers use butane burners instead of wood or charcoal.
1. Butane is more flammable than wood or charcoal
2. Betane produces less soot when burning

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DoN . 5287 x 5505 :1.What type of compounds is mainly present in the candle wax?
Hydrocarbon Compounds

2.Why does the candle burn with yellow flame?
Candle wax has a high number of Carbon content

3. Why is it dangerous to add cold water to a tray containing molten wax at high temperature?
It is because water will evaporate and form steam, steam may cause severe burn.

5. Give 2 reasons why many campers use butane burners instead of wood or charcoal.
1. Butane is more flammable than wood or charcoal
2. Butane produces less soot when burning

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其實點知butane is more flammable than wood or charcoal? 1.可唔可以係alkanes?

smb :

DoN . 5287 x 5505 :1.What type of compounds is mainly present in the candle wax?
Hydrocarbon Compounds

2.Why does the candle burn with yellow flame?
Candle wax has a high number of Carbon content

3. Why is it dangerous to add cold water to a tray containing molten wax at high temperature?
It is because water will evaporate and form steam, steam may cause severe burn.

5. Give 2 reasons why many campers use butane burners instead of wood or charcoal.
1. Butane is more flammable than wood or charcoal
2. Butane produces less soot when burning

我 唔 知 有 冇 錯 [ CE 過 來 人 一 個 ]
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其實點知butane is more flammable than wood or charcoal? 1.可唔可以係alkanes?

Butane is more flammable than wood or charcoal ,
係因為butane個carbon chain 短過wood同charcoal ,
所以butane係比wood同charcoal 擁有少D carbon atom,
當做combution時,係可以用比較少的能量去overcome butane內的carbon bond,
所以Butane is more flammable than wood or charcoal .
(原理同燃燒LPG與燃燒diesel一樣)

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