Which statement supports the fact that radioactive isotopes are useful in medicine? a. ra-229 has a half-life of 4 minutes. b. c-14 can be used to calculate the age of remains. c. i-123 can be used to diagnose and treat thyroid problems. d. sr-90 was released into the environment when a chernobyl nuclear reactor exploded.

the answer is

C. I-123 can be used to help diagnose and treat thyroid problems.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.