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.
That number represents nearly 14 percent of the total time in a week. All that time is taking a toll on users, a new eMarketer report found. However, 54 percent of survey respondents said they have tried to decrease their reliance on technology in the past year in favor of more in-person contact.