Answer:
The correct answer is CO2 + H2O yields H2CO3
Explanation:
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Synthesis reactions are those that two compounds or elements come together to form another.
Let's analyze each of the reactions:
C2H4 + 3 O2 yields 2 CO2 + 2 H2O in this reaction there is a recombination of elements
2HBr yields H2 + Br2 in this reaction the hydrogen bromide is broken and two simpler molecules are formed
CO2 + H2O yields H2CO3 in this reaction two compounds come together and form one
F2 + 2 HCl yields Cl2 + 2 HF in this reaction there is a rearrangement of elements
After the analysis, we conclude that the correct answer is CO2 + H2O yields H2CO3