Alcohol combustion (ethanol)
M.C.Q.: Choose the correct answer(s)
🇫🇷 French Version
In the chemistry laboratory, an alcohol burner is sometimes used to heat test tubes.
Alcohol burner
1.
The formula of the ethanol molecule is C
2
H
6
O. This molecule contains:
1 carbon atom, 2 hydrogen atoms, and 6 oxygen atoms
2 carbon atoms, 6 hydrogen atoms, and 0 oxygen atoms
2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom
2.
Ethanol is a transparent liquid that contains molecules of:
water H
2
O
ethanol C
2
H
6
O
methane CH
4
3.
When ethanol burns, the substances that disappear (the reactants) are:
dinitrogen
dioxygen
water
ethanol
4.
When ethanol combustion is complete, the substances that form (the products) are:
water
ethanol
carbon
dinitrogen
carbon dioxide
dioxygen
carbon monoxide
5.
The word equation for complete ethanol combustion is:
Ethanol + Dioxygen → Water + Carbon
Ethanol + Carbon dioxide → Water + Dioxygen
Ethanol + Dioxygen → Water + Carbon dioxide
6.
During ethanol combustion, water molecules (H
2
O) are formed.
The two hydrogen atoms H in this molecule come from molecules of:
ethanol C
2
H
6
O
dioxygen O
2
and the oxygen atom O in this molecule may come from
only a dioxygen molecule O
2
only an ethanol molecule C
2
H
6
O
a dioxygen molecule O
2
or an ethanol molecule C
2
H
6
O
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