Question

In 1827, John Walker, 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 on. How does the author develop the idea that humanity's early fire-starting tools may have been dangerous?

Answer 1

Btw thi sis math, just letting you know :)

Answer 2

this is*

Answer 3

welcome to openstudy