Immediately after the chernobyl nuclear accident, the concentratiorn of 137cs (cesium 137) in cow's milk was 12,000 bq/l (a becquerel is a measure of radioactivity; one becquerel equals one radioactive disintegration per second). assume that the only reaction by which the 137cs was lost from the soil was through radioactive decay. also assume that the concentration in cows milk is directly proportional to the concentration in the soil. calculate the concentration of 137cs in cow's milk (from feeding on grass in the soil) 5 years after the accident given a half-life for 137cs of 30 years.

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.

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory

Afusion reaction takes place between carbon and another element. neutrons are released, and a different element is formed. the different element is a) lighter than helium.b)heavier than helium.c)the same weight as helium.d)dependent on the element that reacted with carbon.