Here's why:
* Friction and Heat: Matches are designed to ignite when struck against a specially prepared striking surface. This surface usually contains red phosphorus and other chemicals that create friction and heat when struck.
* Cement is not a striking surface: Cement is a hard and smooth surface. It does not contain the necessary chemicals to ignite a match. Rubbing a match against cement will generate some heat, but not enough to overcome the ignition temperature of the match head.
* The Match Head's Composition: The head of a match contains a chemical mixture designed to ignite quickly when exposed to friction and heat from the striking surface.
In short, a cemented wall lacks the necessary ingredients and properties to ignite a matchstick.