2007-03-31 16:30:36 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
!!!!
Sorry, Wrong Question. This is the question:
Combustion of C2H5OH with O2.
Evidence of chemical reaction.
1. Precipitate formed.
2. A smell released.
3. Bubbles released.
4. Color changed.
2007-03-31 16:32:01 · update #1
Combustible gases and oxygen often can be mixed in proportions in which the rate of chemical reaction is explosive. For hydrogen gas, H2, the range of explosive proportions is very large. For methane, the range is on the order of 5 to 15%.
For the real word, the combustion of ethanol normally or I would say it results in explosions. But for your question, the answer is : Bubbles are formed/seen/released. The bubbles indicates the gas Hydrogen as said in the above statement.
2007-03-31 16:44:00 · answer #1 · answered by brad 3 · 0⤊ 0⤋
Burning of ethanol is clearly a chemical change. Your choices are not so clear, but I guess you could claim the bubbles could make sense or a change of color, due to the flame. There is certainly no precipitate involved
2007-03-31 23:35:46 · answer #2 · answered by reb1240 7 · 0⤊ 0⤋
Complete combustion of ethanol yields CO2 and H2O
CO2 is not a precipitate, nor smelly, or will change the color of the soln. Evolution of a gas (CO2) implies bubbling, dude.
2007-03-31 23:46:23 · answer #3 · answered by Alan V 3 · 0⤊ 0⤋