2mgo à 2mg + o2 is an example of a chemical reaction.
a. synthesis
b. combustion
c. replacement
d. decomposition

2MgO → 2Mg + O2 is an example of a decomposition chemical reaction. The answer is letter D. It is not a replacement reaction because no other compound is involved. It is not a combustion reaction because no oxygen is involved.

D. decomposition

Explanation:

Synthesis reaction occurs when two elements or compounds react to originate a new one:

A + B ⇒ C  

Combustion occurs when a fuel reacts with oxygen to form CO₂ and water:

A + O₂ ⇒ CO₂ + H₂O

Replacement reaction can be simple or double. Simple occurs when a simple element replaces others in a compound:

A + BC ⇒ B + AC

Double occurs when two compounds replace elements between them:

AB + CD ⇒ AC + BD

Decomposition reaction occurs when a compound originates two or more compounds

A ⇒ B + C

So, the reaction given is a decomposition chemical reaction.

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 .

what does the table look like