9. the largest source of radiation in most people's lives is
a. medical uses
c. industrial applications
b. natural background radiation d. nuclear weapons testing
10. a radioactive gas that enters many houses from the ground below
a. radium
b. radon
c. carbon-14
d. tritium

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?

8. what happens to matter during a chemical reaction

In the reaction h2co3 (aq) + 3nh3 (aq) = 2 nh4+ (aq) + co3 2-, how many electrons are transferred?