Alcohol's specific heat capacity is lower than that of water and it's density too, also its boiling temperature is lower.

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When alcohol is heated, it will evaporate leaving with a liquid which has a concentrated taste of the drink, but without the alcoholic content.

When alcohol is heated it is not chemically changed. If you heat liquid alcohol enough it will evaporate and you will have alcohol vapor, but it will still be alcohol making it only aphysical change but not chemical.

 When alcohol is exposed to aflame and burn it that then changes the alcohol into carbon dioxide and water then becomes a chemical change. 

Some of the precautions while heating alcohol are never heat alcohol directly on a naked flame, you should take a beaker with boiled water in it.

Alcohol is used to absorb heat because it evaporates quickly thus drawing heat away. Alcohol expands when heated and also evaporates. 

The products that come out when you heat alcohol are ethane gas as the major product.