Question

2H2 + O2 --> 2H2O can be classified as what type of reaction?





A. Both synthesis and combustion.


B. Only synthesis.


C. Only combustion.


D. It cannot be classified.

Answer 1

medal and fan will be rewarded

Answer 2

let's look at the others first.
a) single displacement. AB + C --> AC + B.. clearly not this
b) double displacement.. AB + CD ---> AB + CB.. also not this
e) decomposition... AB ---> A + B.. again. not even close..

so is it C or D?..well...
C) synthesis is A + B ---> AB
D) combustion is fuel + oxidizer ---> product(s) + heat.

and you know what? both actually describe the reaction. Is one better than the other? I'd say combustion is more specific but I'd accept either answer from a student.

so my vote is for "D) combustion"

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btw.. this technically isn't an "oxidation" reaction. It is a "redox" reaction. reduction/oxidation. Can't have one without the other right?
H goes from 0 in H2 to +1 in H2O and is "oxidized"
O goes from 0 in O2 to -2 in H2O and is "reduced"