What type of chemical reaction is
4Fe + 30, ---> 2Fe203

oxidation reaction.

Explanation:

Zerovalent iron is oxidized to give  

Zerovalent oxygen is reduced from  

. Each year significant amounts of money are spent to prevent the corrosion of structural steel. It is inevitably a losing battle.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.