Barium-131 is a radioactive isotope of the element barium used for gastrointestinal tract scans in doctors offices. barium-131 has a half-life of 10 days. if a patient drinks 2 grams of barium-131 how much of the isotope will be left after 10 days?
a) 0.125 grams b) 0.25 grams c) 0.5 grams d) 1 gram

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

Sugar is dissolved in water. which is the solute? sugar neither both water

How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.