Matter is anything that has a mass & occupies a space, Mass is the amount of matter that the body contains, The measuring unit of mass is gm or kg, Volume is the space...
The substitution reactions are the reactions that depend on the activity of metals, where the element which is more active substitutes (replaces) the less active one in another compound, The activity of metals can...
The metals and chemical activity Metals can be classified according to their chemical activity into three groups which are very active metals, less active metals, and inactive metals.
