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Which of the following statements is FALSE?

a.
After General Cos surrendered during the Texas Revolution, Mexico ignored the legislative act setting the southwestern boundary of Texas at the Rio Grande .
b.
In 1850 Washington D. C. abolished slavery.
c.
After the U. S. Mexican war, Mexico ceded the upper portion of California and parts of New Mexico to the U. S. for $15 million.
d.
There was strong opposition to the war with Mexico within the U. S. from the Whig party

B is false because D.C. abolished slavery in 1862

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