The half life of radium-226 is 1600 years. How many grams of a 0.25g sample will remain
after 4800 years?

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.

Apound is approximately 0.45 kilogram. a persons weighs 87 kilograms. what is the persons’s weight, in pounds, when expressed to the correct number of significant figures