Which of the following is a synthesis reaction? bao + co2 → baco3 ch4 + o2 → co2 + h2o feco3 → feo + co2 2nh3 → 2n2 + 3h2

 The reaction which is a synthesis reaction is

BaO + CO₂→ BaCO₃

Explanation

Synthesis reaction   a reaction which involve combination of two or more simple substance to from a  more complex  substance.

BaO  and Co₂  combine to form BaCO₃  ( a more complex substance) therefore the  reaction above a synthesis reaction.

 CH₄ + O₂→ Co₂  +H₂O  is a combustion reaction since it  involve a hydrocarbon reacting with O₂

Both FeCo₃  → feO +CO₂  and 2NH₃  →  2N₂ + 3H₂   are  decomposition  reactions.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .