Loose associations, neologisms, perseveration, and clang associations are examples of:

Those are examples of thought disorders. Loose associations are series of ideas that are introduced together but do not have a logical connection. Neologisms are newly created words, which are frequently spoken by children, but that when used by adults may indicate a mental disorder, since they do not make sense. Perseveration can also indicate a mental disorder or brain damage, since the person keeps saying the same word or making the same gesture even though the stimulus (a question asked by an interlocutor, for instance) to do so has ended. Finally, clanging, or clang associations, is a manner of talking in which a series of words are chosen by the speaker not to form a logical meaning, but because of the sound they make when put together.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals