Answer:
The answer to your question is Synthesis and Endothermic
Step-by-step explanation:
Balanced chemical reaction
H₂ + F₂ ⇒ 2HF + 546 kJ
Chemical reactions can be classified in different ways, so I suggest two names of this reaction.
1.- This is a synthesis reaction because two different reactants form a new compound.
2.- This is an endothermic reaction because it was needed to supply 546 kJ of energy so that the reaction proceeds.