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.
Not necessarily all at once, Moffitt says, however, there's no part of the brain that simply doesn't do anything.. After all, the brain uses around 20 percent of your body's energy, even though it only accounts for a small percentage of your whole body weight, Scientific American reported. See, your mind is way more impressive than you might have thought.