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

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

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n