4. (a) Some materials burn with a flame,
whereas others burn without a flame.
Why?
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Answer:
The combustible substances like wax, which vaporize on burning produce flames. And those combustible substances which do not get vaporize on burning do not produce flame. ... Secondly on burning if carbon present in substance burn completely, flame is produced due to reaction of oxygen with carbon
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Answer:
do those substances which vaporize burn with flame where as non vaporizing substances born without a flame
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