For example, the brown crust on atoaste d marshmallow is the result of sugar changing to iffer-ent substances in a mixture called caramel. A change in matterthat produces one or more new substances is a chemicalchange, or chemical reaction. The burning of gasoline in acarâs engine is a chemical change.
How much brain power does the average person use? About only 10% Though an alluring idea, the 10 percent myth is so wrong it is almost laughable, says neurologist Barry Gordon at Johns Hopkins School of Medicine in Baltimorâ¦e.
It is perhaps because of this that people frequently feel that they possess some untapped potential, if only they could unlock that inaccessible portion of their mind. In reality, the 10 percent claim is 100 percent myth. You use all of your brain. The only instances where there are unused regions of the brain are those in which brain damage or disease has destroyed certain regions. Researchers suggest that this popular urban legend has existed since at least the early 1900s.