In London, an exhibition recently opened that features the work of what historic artist, whose name has stirred
debate because so many people pronounce it differently?

Van Gogh

Explanation:

The exhibition referenced in the question is "Meet Vincent van Gogh", interactive installation exhibition that opened in London in early February.

The audio guide that accompanies it started a debate because the artist's name is pronounced "Van Go", like it would be pronounced in America, rather than Britain version "Van Gof".

The Dutch version is more like "Van Khokh", but this event showed the name is differently pronounced in each country - Gof in Britan, Go in the US, Gog in France, etc.

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