Question

which of the following is a synthesis reaction?

A) C2H4 + 3 O2 = 2CO2 + 2 H 2 O
B) 2HCI = H2 + H2 + CI2
C) 2K + 2 HCI = 2 KCI + H2
D) SO3 + H2O = H2SO4

Answer 1

The general form of a direct combination reaction is:
\[A + B → AB\] Where A and B are elements or compounds, and AB is a compound consisting of A and B.

Answer 2

So eliminate those that do not apply to the rules
B is not correct because it is breaking apart (decomposition reaction)

Answer 3

A isn't right because it is AB + CD = AD + CB

Answer 4

Now guess between C and D @sierrapena